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/thread2.h>
70 #include <sys/mplock2.h>
72 #include <vm/vm_zone.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 private zones.
161 static vm_zone_t cryptop_zone;
162 static vm_zone_t cryptodesc_zone;
164 int crypto_userasymcrypto = 1; /* userland may do asym crypto reqs */
165 SYSCTL_INT(_kern, OID_AUTO, userasymcrypto, CTLFLAG_RW,
166 &crypto_userasymcrypto, 0,
167 "Enable/disable user-mode access to asymmetric crypto support");
168 int crypto_devallowsoft = 0; /* only use hardware crypto for asym */
169 SYSCTL_INT(_kern, OID_AUTO, cryptodevallowsoft, CTLFLAG_RW,
170 &crypto_devallowsoft, 0,
171 "Enable/disable use of software asym crypto support");
172 int crypto_altdispatch = 0; /* dispatch to alternative cpu */
173 SYSCTL_INT(_kern, OID_AUTO, cryptoaltdispatch, CTLFLAG_RW,
174 &crypto_altdispatch, 0,
175 "Do not queue crypto op on current cpu");
177 MALLOC_DEFINE(M_CRYPTO_DATA, "crypto", "crypto session records");
179 static void crypto_proc(void *dummy);
180 static void crypto_ret_proc(void *dummy);
181 static struct thread *cryptoretthread;
182 static void crypto_destroy(void);
183 static int crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint);
184 static int crypto_kinvoke(struct cryptkop *krp, int flags);
186 static struct cryptostats cryptostats;
187 SYSCTL_STRUCT(_kern, OID_AUTO, crypto_stats, CTLFLAG_RW, &cryptostats,
188 cryptostats, "Crypto system statistics");
191 static int crypto_timing = 0;
192 SYSCTL_INT(_debug, OID_AUTO, crypto_timing, CTLFLAG_RW,
193 &crypto_timing, 0, "Enable/disable crypto timing support");
199 crypto_tdinfo_t tdinfo;
203 lockinit(&crypto_drivers_lock, "crypto driver table", 0, LK_CANRECURSE);
205 TAILQ_INIT(&crp_ret_q);
206 TAILQ_INIT(&crp_ret_kq);
207 lockinit(&crypto_ret_q_lock, "crypto return queues", 0, LK_CANRECURSE);
209 cryptop_zone = zinit("cryptop", sizeof (struct cryptop), 0, 0, 1);
210 cryptodesc_zone = zinit("cryptodesc", sizeof (struct cryptodesc),
212 if (cryptodesc_zone == NULL || cryptop_zone == NULL) {
213 kprintf("crypto_init: cannot setup crypto zones\n");
218 crypto_drivers_num = CRYPTO_DRIVERS_INITIAL;
219 crypto_drivers = kmalloc(crypto_drivers_num * sizeof(struct cryptocap),
220 M_CRYPTO_DATA, M_WAITOK | M_ZERO);
221 if (crypto_drivers == NULL) {
222 kprintf("crypto_init: cannot malloc driver table\n");
227 for (n = 0; n < ncpus; ++n) {
228 tdinfo = &tdinfo_array[n];
229 TAILQ_INIT(&tdinfo->crp_q);
230 TAILQ_INIT(&tdinfo->crp_kq);
231 lockinit(&tdinfo->crp_lock, "crypto op queues",
233 kthread_create_cpu(crypto_proc, tdinfo, &tdinfo->crp_td,
236 kthread_create(crypto_ret_proc, NULL,
237 &cryptoretthread, "crypto returns");
245 * Signal a crypto thread to terminate. We use the driver
246 * table lock to synchronize the sleep/wakeups so that we
247 * are sure the threads have terminated before we release
248 * the data structures they use. See crypto_finis below
249 * for the other half of this song-and-dance.
252 crypto_terminate(struct thread **tp, void *q)
256 KKASSERT(lockstatus(&crypto_drivers_lock, curthread) != 0);
260 kprintf("crypto_terminate: start\n");
263 tsleep_interlock(t, 0);
264 CRYPTO_DRIVER_UNLOCK(); /* let crypto_finis progress */
266 tsleep(t, PINTERLOCKED, "crypto_destroy", 0);
267 CRYPTO_DRIVER_LOCK();
268 kprintf("crypto_terminate: end\n");
275 crypto_tdinfo_t tdinfo;
279 * Terminate any crypto threads.
281 CRYPTO_DRIVER_LOCK();
282 for (n = 0; n < ncpus; ++n) {
283 tdinfo = &tdinfo_array[n];
284 crypto_terminate(&tdinfo->crp_td, &tdinfo->crp_q);
285 lockuninit(&tdinfo->crp_lock);
287 crypto_terminate(&cryptoretthread, &crp_ret_q);
288 CRYPTO_DRIVER_UNLOCK();
290 /* XXX flush queues??? */
293 * Reclaim dynamically allocated resources.
295 if (crypto_drivers != NULL)
296 kfree(crypto_drivers, M_CRYPTO_DATA);
298 if (cryptodesc_zone != NULL)
299 zdestroy(cryptodesc_zone);
300 if (cryptop_zone != NULL)
301 zdestroy(cryptop_zone);
302 lockuninit(&crypto_ret_q_lock);
303 lockuninit(&crypto_drivers_lock);
306 static struct cryptocap *
307 crypto_checkdriver(u_int32_t hid)
309 if (crypto_drivers == NULL)
311 return (hid >= crypto_drivers_num ? NULL : &crypto_drivers[hid]);
315 * Compare a driver's list of supported algorithms against another
316 * list; return non-zero if all algorithms are supported.
319 driver_suitable(const struct cryptocap *cap, const struct cryptoini *cri)
321 const struct cryptoini *cr;
323 /* See if all the algorithms are supported. */
324 for (cr = cri; cr; cr = cr->cri_next)
325 if (cap->cc_alg[cr->cri_alg] == 0)
331 * Select a driver for a new session that supports the specified
332 * algorithms and, optionally, is constrained according to the flags.
333 * The algorithm we use here is pretty stupid; just use the
334 * first driver that supports all the algorithms we need. If there
335 * are multiple drivers we choose the driver with the fewest active
336 * sessions. We prefer hardware-backed drivers to software ones.
338 * XXX We need more smarts here (in real life too, but that's
339 * XXX another story altogether).
341 static struct cryptocap *
342 crypto_select_driver(const struct cryptoini *cri, int flags)
344 struct cryptocap *cap, *best;
347 CRYPTO_DRIVER_ASSERT();
350 * Look first for hardware crypto devices if permitted.
352 if (flags & CRYPTOCAP_F_HARDWARE)
353 match = CRYPTOCAP_F_HARDWARE;
355 match = CRYPTOCAP_F_SOFTWARE;
358 for (hid = 0; hid < crypto_drivers_num; hid++) {
359 cap = &crypto_drivers[hid];
361 * If it's not initialized, is in the process of
362 * going away, or is not appropriate (hardware
363 * or software based on match), then skip.
365 if (cap->cc_dev == NULL ||
366 (cap->cc_flags & CRYPTOCAP_F_CLEANUP) ||
367 (cap->cc_flags & match) == 0)
370 /* verify all the algorithms are supported. */
371 if (driver_suitable(cap, cri)) {
373 cap->cc_sessions < best->cc_sessions)
379 if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) {
380 /* sort of an Algol 68-style for loop */
381 match = CRYPTOCAP_F_SOFTWARE;
388 * Create a new session. The crid argument specifies a crypto
389 * driver to use or constraints on a driver to select (hardware
390 * only, software only, either). Whatever driver is selected
391 * must be capable of the requested crypto algorithms.
394 crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int crid)
396 struct cryptocap *cap;
400 CRYPTO_DRIVER_LOCK();
401 if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
403 * Use specified driver; verify it is capable.
405 cap = crypto_checkdriver(crid);
406 if (cap != NULL && !driver_suitable(cap, cri))
410 * No requested driver; select based on crid flags.
412 cap = crypto_select_driver(cri, crid);
414 * if NULL then can't do everything in one session.
415 * XXX Fix this. We need to inject a "virtual" session
416 * XXX layer right about here.
420 /* Call the driver initialization routine. */
421 hid = cap - crypto_drivers;
422 lid = hid; /* Pass the driver ID. */
423 err = CRYPTODEV_NEWSESSION(cap->cc_dev, &lid, cri);
425 (*sid) = (cap->cc_flags & 0xff000000)
426 | (hid & 0x00ffffff);
428 (*sid) |= (lid & 0xffffffff);
433 CRYPTO_DRIVER_UNLOCK();
438 crypto_remove(struct cryptocap *cap)
441 KKASSERT(lockstatus(&crypto_drivers_lock, curthread) != 0);
442 if (cap->cc_sessions == 0 && cap->cc_koperations == 0)
443 bzero(cap, sizeof(*cap));
447 * Delete an existing session (or a reserved session on an unregistered
451 crypto_freesession(u_int64_t sid)
453 struct cryptocap *cap;
457 CRYPTO_DRIVER_LOCK();
459 if (crypto_drivers == NULL) {
464 /* Determine two IDs. */
465 hid = CRYPTO_SESID2HID(sid);
467 if (hid >= crypto_drivers_num) {
471 cap = &crypto_drivers[hid];
473 if (cap->cc_sessions)
476 /* Call the driver cleanup routine, if available. */
477 err = CRYPTODEV_FREESESSION(cap->cc_dev, sid);
479 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP)
483 CRYPTO_DRIVER_UNLOCK();
488 * Return an unused driver id. Used by drivers prior to registering
489 * support for the algorithms they handle.
492 crypto_get_driverid(device_t dev, int flags)
494 struct cryptocap *newdrv;
497 if ((flags & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
498 kprintf("%s: no flags specified when registering driver\n",
499 device_get_nameunit(dev));
503 CRYPTO_DRIVER_LOCK();
505 for (i = 0; i < crypto_drivers_num; i++) {
506 if (crypto_drivers[i].cc_dev == NULL &&
507 (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) == 0) {
512 /* Out of entries, allocate some more. */
513 if (i == crypto_drivers_num) {
514 /* Be careful about wrap-around. */
515 if (2 * crypto_drivers_num <= crypto_drivers_num) {
516 CRYPTO_DRIVER_UNLOCK();
517 kprintf("crypto: driver count wraparound!\n");
521 newdrv = kmalloc(2 * crypto_drivers_num *
522 sizeof(struct cryptocap),
523 M_CRYPTO_DATA, M_WAITOK|M_ZERO);
524 if (newdrv == NULL) {
525 CRYPTO_DRIVER_UNLOCK();
526 kprintf("crypto: no space to expand driver table!\n");
530 bcopy(crypto_drivers, newdrv,
531 crypto_drivers_num * sizeof(struct cryptocap));
533 crypto_drivers_num *= 2;
535 kfree(crypto_drivers, M_CRYPTO_DATA);
536 crypto_drivers = newdrv;
539 /* NB: state is zero'd on free */
540 crypto_drivers[i].cc_sessions = 1; /* Mark */
541 crypto_drivers[i].cc_dev = dev;
542 crypto_drivers[i].cc_flags = flags;
544 kprintf("crypto: assign %s driver id %u, flags %u\n",
545 device_get_nameunit(dev), i, flags);
547 CRYPTO_DRIVER_UNLOCK();
553 * Lookup a driver by name. We match against the full device
554 * name and unit, and against just the name. The latter gives
555 * us a simple widlcarding by device name. On success return the
556 * driver/hardware identifier; otherwise return -1.
559 crypto_find_driver(const char *match)
561 int i, len = strlen(match);
563 CRYPTO_DRIVER_LOCK();
564 for (i = 0; i < crypto_drivers_num; i++) {
565 device_t dev = crypto_drivers[i].cc_dev;
567 (crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP))
569 if (strncmp(match, device_get_nameunit(dev), len) == 0 ||
570 strncmp(match, device_get_name(dev), len) == 0)
573 CRYPTO_DRIVER_UNLOCK();
574 return i < crypto_drivers_num ? i : -1;
578 * Return the device_t for the specified driver or NULL
579 * if the driver identifier is invalid.
582 crypto_find_device_byhid(int hid)
584 struct cryptocap *cap = crypto_checkdriver(hid);
585 return cap != NULL ? cap->cc_dev : NULL;
589 * Return the device/driver capabilities.
592 crypto_getcaps(int hid)
594 struct cryptocap *cap = crypto_checkdriver(hid);
595 return cap != NULL ? cap->cc_flags : 0;
599 * Register support for a key-related algorithm. This routine
600 * is called once for each algorithm supported a driver.
603 crypto_kregister(u_int32_t driverid, int kalg, u_int32_t flags)
605 struct cryptocap *cap;
608 CRYPTO_DRIVER_LOCK();
610 cap = crypto_checkdriver(driverid);
612 (CRK_ALGORITM_MIN <= kalg && kalg <= CRK_ALGORITHM_MAX)) {
614 * XXX Do some performance testing to determine placing.
615 * XXX We probably need an auxiliary data structure that
616 * XXX describes relative performances.
619 cap->cc_kalg[kalg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
621 kprintf("crypto: %s registers key alg %u flags %u\n"
622 , device_get_nameunit(cap->cc_dev)
631 CRYPTO_DRIVER_UNLOCK();
636 * Register support for a non-key-related algorithm. This routine
637 * is called once for each such algorithm supported by a driver.
640 crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
643 struct cryptocap *cap;
646 CRYPTO_DRIVER_LOCK();
648 cap = crypto_checkdriver(driverid);
649 /* NB: algorithms are in the range [1..max] */
651 (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX)) {
653 * XXX Do some performance testing to determine placing.
654 * XXX We probably need an auxiliary data structure that
655 * XXX describes relative performances.
658 cap->cc_alg[alg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
659 cap->cc_max_op_len[alg] = maxoplen;
661 kprintf("crypto: %s registers alg %u flags %u maxoplen %u\n"
662 , device_get_nameunit(cap->cc_dev)
667 cap->cc_sessions = 0; /* Unmark */
672 CRYPTO_DRIVER_UNLOCK();
677 driver_finis(struct cryptocap *cap)
681 CRYPTO_DRIVER_ASSERT();
683 ses = cap->cc_sessions;
684 kops = cap->cc_koperations;
685 bzero(cap, sizeof(*cap));
686 if (ses != 0 || kops != 0) {
688 * If there are pending sessions,
689 * just mark as invalid.
691 cap->cc_flags |= CRYPTOCAP_F_CLEANUP;
692 cap->cc_sessions = ses;
693 cap->cc_koperations = kops;
698 * Unregister a crypto driver. If there are pending sessions using it,
699 * leave enough information around so that subsequent calls using those
700 * sessions will correctly detect the driver has been unregistered and
704 crypto_unregister(u_int32_t driverid, int alg)
706 struct cryptocap *cap;
709 CRYPTO_DRIVER_LOCK();
710 cap = crypto_checkdriver(driverid);
712 (CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX) &&
713 cap->cc_alg[alg] != 0) {
714 cap->cc_alg[alg] = 0;
715 cap->cc_max_op_len[alg] = 0;
717 /* Was this the last algorithm ? */
718 for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++) {
719 if (cap->cc_alg[i] != 0)
723 if (i == CRYPTO_ALGORITHM_MAX + 1)
729 CRYPTO_DRIVER_UNLOCK();
735 * Unregister all algorithms associated with a crypto driver.
736 * If there are pending sessions using it, leave enough information
737 * around so that subsequent calls using those sessions will
738 * correctly detect the driver has been unregistered and reroute
742 crypto_unregister_all(u_int32_t driverid)
744 struct cryptocap *cap;
747 CRYPTO_DRIVER_LOCK();
748 cap = crypto_checkdriver(driverid);
755 CRYPTO_DRIVER_UNLOCK();
761 * Clear blockage on a driver. The what parameter indicates whether
762 * the driver is now ready for cryptop's and/or cryptokop's.
765 crypto_unblock(u_int32_t driverid, int what)
767 crypto_tdinfo_t tdinfo;
768 struct cryptocap *cap;
772 CRYPTO_DRIVER_LOCK();
773 cap = crypto_checkdriver(driverid);
775 if (what & CRYPTO_SYMQ)
776 cap->cc_qblocked = 0;
777 if (what & CRYPTO_ASYMQ)
778 cap->cc_kqblocked = 0;
779 for (n = 0; n < ncpus; ++n) {
780 tdinfo = &tdinfo_array[n];
781 CRYPTO_Q_LOCK(tdinfo);
782 if (tdinfo[n].crp_sleep)
783 wakeup_one(&tdinfo->crp_q);
784 CRYPTO_Q_UNLOCK(tdinfo);
790 CRYPTO_DRIVER_UNLOCK();
795 static volatile int dispatch_rover;
798 * Add a crypto request to a queue, to be processed by the kernel thread.
801 crypto_dispatch(struct cryptop *crp)
803 crypto_tdinfo_t tdinfo;
804 struct cryptocap *cap;
809 cryptostats.cs_ops++;
813 nanouptime(&crp->crp_tstamp);
816 hid = CRYPTO_SESID2HID(crp->crp_sid);
819 * Dispatch the crypto op directly to the driver if the caller
820 * marked the request to be processed immediately or this is
821 * a synchronous callback chain occuring from within a crypto
824 * Fall through to queueing the driver is blocked.
826 if ((crp->crp_flags & CRYPTO_F_BATCH) == 0 ||
827 (curthread->td_flags & TDF_CRYPTO)) {
828 cap = crypto_checkdriver(hid);
829 /* Driver cannot disappeared when there is an active session. */
830 KASSERT(cap != NULL, ("%s: Driver disappeared.", __func__));
831 if (!cap->cc_qblocked) {
832 result = crypto_invoke(cap, crp, 0);
833 if (result != ERESTART)
836 * The driver ran out of resources, put the request on
843 * Dispatch to a cpu for action if possible. Dispatch to a different
844 * cpu than the current cpu.
846 if (CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SMP) {
847 n = atomic_fetchadd_int(&dispatch_rover, 1) & 255;
848 if (crypto_altdispatch && mycpu->gd_cpuid == n)
854 tdinfo = &tdinfo_array[n];
856 CRYPTO_Q_LOCK(tdinfo);
857 TAILQ_INSERT_TAIL(&tdinfo->crp_q, crp, crp_next);
858 if (tdinfo->crp_sleep)
859 wakeup_one(&tdinfo->crp_q);
860 CRYPTO_Q_UNLOCK(tdinfo);
865 * Add an asymetric crypto request to a queue,
866 * to be processed by the kernel thread.
869 crypto_kdispatch(struct cryptkop *krp)
871 crypto_tdinfo_t tdinfo;
875 cryptostats.cs_kops++;
878 /* not sure how to test F_SMP here */
879 n = atomic_fetchadd_int(&dispatch_rover, 1) & 255;
883 tdinfo = &tdinfo_array[n];
885 error = crypto_kinvoke(krp, krp->krp_crid);
887 if (error == ERESTART) {
888 CRYPTO_Q_LOCK(tdinfo);
889 TAILQ_INSERT_TAIL(&tdinfo->crp_kq, krp, krp_next);
890 if (tdinfo->crp_sleep)
891 wakeup_one(&tdinfo->crp_q);
892 CRYPTO_Q_UNLOCK(tdinfo);
899 * Verify a driver is suitable for the specified operation.
902 kdriver_suitable(const struct cryptocap *cap, const struct cryptkop *krp)
904 return (cap->cc_kalg[krp->krp_op] & CRYPTO_ALG_FLAG_SUPPORTED) != 0;
908 * Select a driver for an asym operation. The driver must
909 * support the necessary algorithm. The caller can constrain
910 * which device is selected with the flags parameter. The
911 * algorithm we use here is pretty stupid; just use the first
912 * driver that supports the algorithms we need. If there are
913 * multiple suitable drivers we choose the driver with the
914 * fewest active operations. We prefer hardware-backed
915 * drivers to software ones when either may be used.
917 static struct cryptocap *
918 crypto_select_kdriver(const struct cryptkop *krp, int flags)
920 struct cryptocap *cap, *best, *blocked;
923 CRYPTO_DRIVER_ASSERT();
926 * Look first for hardware crypto devices if permitted.
928 if (flags & CRYPTOCAP_F_HARDWARE)
929 match = CRYPTOCAP_F_HARDWARE;
931 match = CRYPTOCAP_F_SOFTWARE;
935 for (hid = 0; hid < crypto_drivers_num; hid++) {
936 cap = &crypto_drivers[hid];
938 * If it's not initialized, is in the process of
939 * going away, or is not appropriate (hardware
940 * or software based on match), then skip.
942 if (cap->cc_dev == NULL ||
943 (cap->cc_flags & CRYPTOCAP_F_CLEANUP) ||
944 (cap->cc_flags & match) == 0)
947 /* verify all the algorithms are supported. */
948 if (kdriver_suitable(cap, krp)) {
950 cap->cc_koperations < best->cc_koperations)
956 if (match == CRYPTOCAP_F_HARDWARE && (flags & CRYPTOCAP_F_SOFTWARE)) {
957 /* sort of an Algol 68-style for loop */
958 match = CRYPTOCAP_F_SOFTWARE;
965 * Dispatch an assymetric crypto request.
968 crypto_kinvoke(struct cryptkop *krp, int crid)
970 struct cryptocap *cap = NULL;
973 KASSERT(krp != NULL, ("%s: krp == NULL", __func__));
974 KASSERT(krp->krp_callback != NULL,
975 ("%s: krp->crp_callback == NULL", __func__));
977 CRYPTO_DRIVER_LOCK();
978 if ((crid & (CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE)) == 0) {
979 cap = crypto_checkdriver(crid);
982 * Driver present, it must support the necessary
983 * algorithm and, if s/w drivers are excluded,
984 * it must be registered as hardware-backed.
986 if (!kdriver_suitable(cap, krp) ||
987 (!crypto_devallowsoft &&
988 (cap->cc_flags & CRYPTOCAP_F_HARDWARE) == 0))
993 * No requested driver; select based on crid flags.
995 if (!crypto_devallowsoft) /* NB: disallow s/w drivers */
996 crid &= ~CRYPTOCAP_F_SOFTWARE;
997 cap = crypto_select_kdriver(krp, crid);
999 if (cap != NULL && !cap->cc_kqblocked) {
1000 krp->krp_hid = cap - crypto_drivers;
1001 cap->cc_koperations++;
1002 CRYPTO_DRIVER_UNLOCK();
1003 error = CRYPTODEV_KPROCESS(cap->cc_dev, krp, 0);
1004 CRYPTO_DRIVER_LOCK();
1005 if (error == ERESTART) {
1006 cap->cc_koperations--;
1007 CRYPTO_DRIVER_UNLOCK();
1012 * NB: cap is !NULL if device is blocked; in
1013 * that case return ERESTART so the operation
1014 * is resubmitted if possible.
1016 error = (cap == NULL) ? ENODEV : ERESTART;
1018 CRYPTO_DRIVER_UNLOCK();
1021 krp->krp_status = error;
1027 #ifdef CRYPTO_TIMING
1029 crypto_tstat(struct cryptotstat *ts, struct timespec *tv)
1031 struct timespec now, t;
1034 t.tv_sec = now.tv_sec - tv->tv_sec;
1035 t.tv_nsec = now.tv_nsec - tv->tv_nsec;
1036 if (t.tv_nsec < 0) {
1038 t.tv_nsec += 1000000000;
1040 timespecadd(&ts->acc, &t);
1041 if (timespeccmp(&t, &ts->min, <))
1043 if (timespeccmp(&t, &ts->max, >))
1052 * Dispatch a crypto request to the appropriate crypto devices.
1055 crypto_invoke(struct cryptocap *cap, struct cryptop *crp, int hint)
1058 KASSERT(crp != NULL, ("%s: crp == NULL", __func__));
1059 KASSERT(crp->crp_callback != NULL,
1060 ("%s: crp->crp_callback == NULL", __func__));
1061 KASSERT(crp->crp_desc != NULL, ("%s: crp->crp_desc == NULL", __func__));
1063 #ifdef CRYPTO_TIMING
1065 crypto_tstat(&cryptostats.cs_invoke, &crp->crp_tstamp);
1067 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP) {
1068 struct cryptodesc *crd;
1072 * Driver has unregistered; migrate the session and return
1073 * an error to the caller so they'll resubmit the op.
1075 * XXX: What if there are more already queued requests for this
1078 crypto_freesession(crp->crp_sid);
1080 for (crd = crp->crp_desc; crd->crd_next; crd = crd->crd_next)
1081 crd->CRD_INI.cri_next = &(crd->crd_next->CRD_INI);
1083 /* XXX propagate flags from initial session? */
1084 if (crypto_newsession(&nid, &(crp->crp_desc->CRD_INI),
1085 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE) == 0)
1088 crp->crp_etype = EAGAIN;
1093 * Invoke the driver to process the request.
1095 return CRYPTODEV_PROCESS(cap->cc_dev, crp, hint);
1100 * Release a set of crypto descriptors.
1103 crypto_freereq(struct cryptop *crp)
1105 struct cryptodesc *crd;
1107 crypto_tdinfo_t tdinfo;
1108 struct cryptop *crp2;
1116 for (n = 0; n < ncpus; ++n) {
1117 tdinfo = &tdinfo_array[n];
1119 CRYPTO_Q_LOCK(tdinfo);
1120 TAILQ_FOREACH(crp2, &tdinfo->crp_q, crp_next) {
1121 KASSERT(crp2 != crp,
1122 ("Freeing cryptop from the crypto queue (%p).",
1125 CRYPTO_Q_UNLOCK(tdinfo);
1128 TAILQ_FOREACH(crp2, &crp_ret_q, crp_next) {
1129 KASSERT(crp2 != crp,
1130 ("Freeing cryptop from the return queue (%p).",
1133 CRYPTO_RETQ_UNLOCK();
1136 while ((crd = crp->crp_desc) != NULL) {
1137 crp->crp_desc = crd->crd_next;
1138 zfree(cryptodesc_zone, crd);
1140 zfree(cryptop_zone, crp);
1144 * Acquire a set of crypto descriptors.
1147 crypto_getreq(int num)
1149 struct cryptodesc *crd;
1150 struct cryptop *crp;
1152 crp = zalloc(cryptop_zone);
1154 bzero(crp, sizeof (*crp));
1156 crd = zalloc(cryptodesc_zone);
1158 crypto_freereq(crp);
1161 bzero(crd, sizeof (*crd));
1163 crd->crd_next = crp->crp_desc;
1164 crp->crp_desc = crd;
1171 * Invoke the callback on behalf of the driver.
1174 crypto_done(struct cryptop *crp)
1176 KASSERT((crp->crp_flags & CRYPTO_F_DONE) == 0,
1177 ("crypto_done: op already done, flags 0x%x", crp->crp_flags));
1178 crp->crp_flags |= CRYPTO_F_DONE;
1179 if (crp->crp_etype != 0)
1180 cryptostats.cs_errs++;
1181 #ifdef CRYPTO_TIMING
1183 crypto_tstat(&cryptostats.cs_done, &crp->crp_tstamp);
1186 * CBIMM means unconditionally do the callback immediately;
1187 * CBIFSYNC means do the callback immediately only if the
1188 * operation was done synchronously. Both are used to avoid
1189 * doing extraneous context switches; the latter is mostly
1190 * used with the software crypto driver.
1192 if ((crp->crp_flags & CRYPTO_F_CBIMM) ||
1193 ((crp->crp_flags & CRYPTO_F_CBIFSYNC) &&
1194 (CRYPTO_SESID2CAPS(crp->crp_sid) & CRYPTOCAP_F_SYNC))) {
1196 * Do the callback directly. This is ok when the
1197 * callback routine does very little (e.g. the
1198 * /dev/crypto callback method just does a wakeup).
1200 #ifdef CRYPTO_TIMING
1201 if (crypto_timing) {
1203 * NB: We must copy the timestamp before
1204 * doing the callback as the cryptop is
1205 * likely to be reclaimed.
1207 struct timespec t = crp->crp_tstamp;
1208 crypto_tstat(&cryptostats.cs_cb, &t);
1209 crp->crp_callback(crp);
1210 crypto_tstat(&cryptostats.cs_finis, &t);
1213 crp->crp_callback(crp);
1216 * Normal case; queue the callback for the thread.
1219 if (CRYPTO_RETQ_EMPTY())
1220 wakeup_one(&crp_ret_q); /* shared wait channel */
1221 TAILQ_INSERT_TAIL(&crp_ret_q, crp, crp_next);
1222 CRYPTO_RETQ_UNLOCK();
1227 * Invoke the callback on behalf of the driver.
1230 crypto_kdone(struct cryptkop *krp)
1232 struct cryptocap *cap;
1234 if (krp->krp_status != 0)
1235 cryptostats.cs_kerrs++;
1236 CRYPTO_DRIVER_LOCK();
1237 /* XXX: What if driver is loaded in the meantime? */
1238 if (krp->krp_hid < crypto_drivers_num) {
1239 cap = &crypto_drivers[krp->krp_hid];
1240 cap->cc_koperations--;
1241 KASSERT(cap->cc_koperations >= 0, ("cc_koperations < 0"));
1242 if (cap->cc_flags & CRYPTOCAP_F_CLEANUP)
1245 CRYPTO_DRIVER_UNLOCK();
1247 if (CRYPTO_RETQ_EMPTY())
1248 wakeup_one(&crp_ret_q); /* shared wait channel */
1249 TAILQ_INSERT_TAIL(&crp_ret_kq, krp, krp_next);
1250 CRYPTO_RETQ_UNLOCK();
1254 crypto_getfeat(int *featp)
1256 int hid, kalg, feat = 0;
1258 CRYPTO_DRIVER_LOCK();
1259 for (hid = 0; hid < crypto_drivers_num; hid++) {
1260 const struct cryptocap *cap = &crypto_drivers[hid];
1262 if ((cap->cc_flags & CRYPTOCAP_F_SOFTWARE) &&
1263 !crypto_devallowsoft) {
1266 for (kalg = 0; kalg <= CRK_ALGORITHM_MAX; kalg++)
1267 if (cap->cc_kalg[kalg] & CRYPTO_ALG_FLAG_SUPPORTED)
1270 CRYPTO_DRIVER_UNLOCK();
1276 * Terminate a thread at module unload. The process that
1277 * initiated this is waiting for us to signal that we're gone;
1278 * wake it up and exit. We use the driver table lock to insure
1279 * we don't do the wakeup before they're waiting. There is no
1280 * race here because the waiter sleeps on the proc lock for the
1281 * thread so it gets notified at the right time because of an
1282 * extra wakeup that's done in exit1().
1285 crypto_finis(void *chan)
1287 CRYPTO_DRIVER_LOCK();
1289 CRYPTO_DRIVER_UNLOCK();
1294 * Crypto thread, dispatches crypto requests.
1297 crypto_proc(void *arg)
1299 crypto_tdinfo_t tdinfo = arg;
1300 struct cryptop *crp, *submit;
1301 struct cryptkop *krp;
1302 struct cryptocap *cap;
1306 rel_mplock(); /* release the mplock held on startup */
1308 CRYPTO_Q_LOCK(tdinfo);
1310 curthread->td_flags |= TDF_CRYPTO;
1314 * Find the first element in the queue that can be
1315 * processed and look-ahead to see if multiple ops
1316 * are ready for the same driver.
1320 TAILQ_FOREACH(crp, &tdinfo->crp_q, crp_next) {
1321 hid = CRYPTO_SESID2HID(crp->crp_sid);
1322 cap = crypto_checkdriver(hid);
1324 * Driver cannot disappeared when there is an active
1327 KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
1328 __func__, __LINE__));
1329 if (cap == NULL || cap->cc_dev == NULL) {
1330 /* Op needs to be migrated, process it. */
1335 if (!cap->cc_qblocked) {
1336 if (submit != NULL) {
1338 * We stop on finding another op,
1339 * regardless whether its for the same
1340 * driver or not. We could keep
1341 * searching the queue but it might be
1342 * better to just use a per-driver
1345 if (CRYPTO_SESID2HID(submit->crp_sid) == hid)
1346 hint = CRYPTO_HINT_MORE;
1350 if ((submit->crp_flags & CRYPTO_F_BATCH) == 0)
1352 /* keep scanning for more are q'd */
1356 if (submit != NULL) {
1357 TAILQ_REMOVE(&tdinfo->crp_q, submit, crp_next);
1358 hid = CRYPTO_SESID2HID(submit->crp_sid);
1359 cap = crypto_checkdriver(hid);
1360 KASSERT(cap != NULL, ("%s:%u Driver disappeared.",
1361 __func__, __LINE__));
1363 CRYPTO_Q_UNLOCK(tdinfo);
1364 result = crypto_invoke(cap, submit, hint);
1365 CRYPTO_Q_LOCK(tdinfo);
1367 if (result == ERESTART) {
1369 * The driver ran out of resources, mark the
1370 * driver ``blocked'' for cryptop's and put
1371 * the request back in the queue. It would
1372 * best to put the request back where we got
1373 * it but that's hard so for now we put it
1374 * at the front. This should be ok; putting
1375 * it at the end does not work.
1377 /* XXX validate sid again? */
1378 crypto_drivers[CRYPTO_SESID2HID(submit->crp_sid)].cc_qblocked = 1;
1379 TAILQ_INSERT_HEAD(&tdinfo->crp_q,
1381 cryptostats.cs_blocks++;
1385 /* As above, but for key ops */
1386 TAILQ_FOREACH(krp, &tdinfo->crp_kq, krp_next) {
1387 cap = crypto_checkdriver(krp->krp_hid);
1388 if (cap == NULL || cap->cc_dev == NULL) {
1390 * Operation needs to be migrated, invalidate
1391 * the assigned device so it will reselect a
1392 * new one below. Propagate the original
1393 * crid selection flags if supplied.
1395 krp->krp_hid = krp->krp_crid &
1396 (CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE);
1397 if (krp->krp_hid == 0)
1399 CRYPTOCAP_F_SOFTWARE|CRYPTOCAP_F_HARDWARE;
1402 if (!cap->cc_kqblocked)
1406 TAILQ_REMOVE(&tdinfo->crp_kq, krp, krp_next);
1408 CRYPTO_Q_UNLOCK(tdinfo);
1409 result = crypto_kinvoke(krp, krp->krp_hid);
1410 CRYPTO_Q_LOCK(tdinfo);
1412 if (result == ERESTART) {
1414 * The driver ran out of resources, mark the
1415 * driver ``blocked'' for cryptkop's and put
1416 * the request back in the queue. It would
1417 * best to put the request back where we got
1418 * it but that's hard so for now we put it
1419 * at the front. This should be ok; putting
1420 * it at the end does not work.
1422 /* XXX validate sid again? */
1423 crypto_drivers[krp->krp_hid].cc_kqblocked = 1;
1424 TAILQ_INSERT_HEAD(&tdinfo->crp_kq,
1426 cryptostats.cs_kblocks++;
1430 if (submit == NULL && krp == NULL) {
1432 * Nothing more to be processed. Sleep until we're
1433 * woken because there are more ops to process.
1434 * This happens either by submission or by a driver
1435 * becoming unblocked and notifying us through
1436 * crypto_unblock. Note that when we wakeup we
1437 * start processing each queue again from the
1438 * front. It's not clear that it's important to
1439 * preserve this ordering since ops may finish
1440 * out of order if dispatched to different devices
1441 * and some become blocked while others do not.
1443 tdinfo->crp_sleep = 1;
1444 lksleep (&tdinfo->crp_q, &tdinfo->crp_lock,
1445 0, "crypto_wait", 0);
1446 tdinfo->crp_sleep = 0;
1447 if (tdinfo->crp_td == NULL)
1449 cryptostats.cs_intrs++;
1452 CRYPTO_Q_UNLOCK(tdinfo);
1454 crypto_finis(&tdinfo->crp_q);
1458 * Crypto returns thread, does callbacks for processed crypto requests.
1459 * Callbacks are done here, rather than in the crypto drivers, because
1460 * callbacks typically are expensive and would slow interrupt handling.
1463 crypto_ret_proc(void *dummy __unused)
1465 struct cryptop *crpt;
1466 struct cryptkop *krpt;
1470 /* Harvest return q's for completed ops */
1471 crpt = TAILQ_FIRST(&crp_ret_q);
1473 TAILQ_REMOVE(&crp_ret_q, crpt, crp_next);
1475 krpt = TAILQ_FIRST(&crp_ret_kq);
1477 TAILQ_REMOVE(&crp_ret_kq, krpt, krp_next);
1479 if (crpt != NULL || krpt != NULL) {
1480 CRYPTO_RETQ_UNLOCK();
1482 * Run callbacks unlocked.
1485 #ifdef CRYPTO_TIMING
1486 if (crypto_timing) {
1488 * NB: We must copy the timestamp before
1489 * doing the callback as the cryptop is
1490 * likely to be reclaimed.
1492 struct timespec t = crpt->crp_tstamp;
1493 crypto_tstat(&cryptostats.cs_cb, &t);
1494 crpt->crp_callback(crpt);
1495 crypto_tstat(&cryptostats.cs_finis, &t);
1498 crpt->crp_callback(crpt);
1501 krpt->krp_callback(krpt);
1505 * Nothing more to be processed. Sleep until we're
1506 * woken because there are more returns to process.
1508 lksleep (&crp_ret_q, &crypto_ret_q_lock,
1509 0, "crypto_ret_wait", 0);
1510 if (cryptoretthread == NULL)
1512 cryptostats.cs_rets++;
1515 CRYPTO_RETQ_UNLOCK();
1517 crypto_finis(&crp_ret_q);
1522 db_show_drivers(void)
1526 db_printf("%12s %4s %4s %8s %2s %2s\n"
1534 for (hid = 0; hid < crypto_drivers_num; hid++) {
1535 const struct cryptocap *cap = &crypto_drivers[hid];
1536 if (cap->cc_dev == NULL)
1538 db_printf("%-12s %4u %4u %08x %2u %2u\n"
1539 , device_get_nameunit(cap->cc_dev)
1541 , cap->cc_koperations
1549 DB_SHOW_COMMAND(crypto, db_show_crypto)
1551 crypto_tdinfo_t tdinfo;
1552 struct cryptop *crp;
1558 db_printf("%4s %8s %4s %4s %4s %4s %8s %8s\n",
1559 "HID", "Caps", "Ilen", "Olen", "Etype", "Flags",
1560 "Desc", "Callback");
1562 for (n = 0; n < ncpus; ++n) {
1563 tdinfo = &tdinfo_array[n];
1565 TAILQ_FOREACH(crp, &tdinfo->crp_q, crp_next) {
1566 db_printf("%4u %08x %4u %4u %4u %04x %8p %8p\n"
1567 , (int) CRYPTO_SESID2HID(crp->crp_sid)
1568 , (int) CRYPTO_SESID2CAPS(crp->crp_sid)
1569 , crp->crp_ilen, crp->crp_olen
1577 if (!TAILQ_EMPTY(&crp_ret_q)) {
1578 db_printf("\n%4s %4s %4s %8s\n",
1579 "HID", "Etype", "Flags", "Callback");
1580 TAILQ_FOREACH(crp, &crp_ret_q, crp_next) {
1581 db_printf("%4u %4u %04x %8p\n"
1582 , (int) CRYPTO_SESID2HID(crp->crp_sid)
1591 DB_SHOW_COMMAND(kcrypto, db_show_kcrypto)
1593 crypto_tdinfo_t tdinfo;
1594 struct cryptkop *krp;
1600 db_printf("%4s %5s %4s %4s %8s %4s %8s\n",
1601 "Op", "Status", "#IP", "#OP", "CRID", "HID", "Callback");
1603 for (n = 0; n < ncpus; ++n) {
1604 tdinfo = &tdinfo_array[n];
1606 TAILQ_FOREACH(krp, &tdinfo->crp_kq, krp_next) {
1607 db_printf("%4u %5u %4u %4u %08x %4u %8p\n"
1610 , krp->krp_iparams, krp->krp_oparams
1611 , krp->krp_crid, krp->krp_hid
1616 if (!TAILQ_EMPTY(&crp_ret_q)) {
1617 db_printf("%4s %5s %8s %4s %8s\n",
1618 "Op", "Status", "CRID", "HID", "Callback");
1619 TAILQ_FOREACH(krp, &crp_ret_kq, krp_next) {
1620 db_printf("%4u %5u %08x %4u %8p\n"
1623 , krp->krp_crid, krp->krp_hid
1631 int crypto_modevent(module_t mod, int type, void *unused);
1634 * Initialization code, both for static and dynamic loading.
1635 * Note this is not invoked with the usual MODULE_DECLARE
1636 * mechanism but instead is listed as a dependency by the
1637 * cryptosoft driver. This guarantees proper ordering of
1638 * calls on module load/unload.
1641 crypto_modevent(module_t mod, int type, void *unused)
1647 error = crypto_init();
1648 if (error == 0 && bootverbose)
1649 kprintf("crypto: <crypto core>\n");
1652 /*XXX disallow if active sessions */
1659 MODULE_VERSION(crypto, 1);
1660 MODULE_DEPEND(crypto, zlib, 1, 1, 1);