/
crypto.c
1270 lines (1132 loc) · 31 KB
/
crypto.c
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/* $NetBSD: crypto.c,v 1.18 2007/01/12 12:00:27 daniel Exp $ */
/* $FreeBSD: src/sys/opencrypto/crypto.c,v 1.4.2.5 2003/02/26 00:14:05 sam Exp $ */
/* $OpenBSD: crypto.c,v 1.41 2002/07/17 23:52:38 art Exp $ */
/*
* The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
*
* This code was written by Angelos D. Keromytis in Athens, Greece, in
* February 2000. Network Security Technologies Inc. (NSTI) kindly
* supported the development of this code.
*
* Copyright (c) 2000, 2001 Angelos D. Keromytis
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all source code copies of any software which is or includes a copy or
* modification of this software.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: crypto.c,v 1.18 2007/01/12 12:00:27 daniel Exp $");
/* XXX FIXME: should be defopt'ed */
#define CRYPTO_TIMING /* enable cryptop timing stuff */
#include <sys/param.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/pool.h>
#include <opencrypto/cryptodev.h>
#include <sys/kthread.h>
#include <sys/once.h>
#include <sys/sysctl.h>
#include <opencrypto/xform.h> /* XXX for M_XDATA */
#ifdef __NetBSD__
#define splcrypto splnet
/* below is kludges to check whats still missing */
#define SWI_CRYPTO 17
#define register_swi(lvl, fn) \
softintr_establish(IPL_SOFTNET, (void (*)(void*))fn, NULL)
#define unregister_swi(lvl, fn) softintr_disestablish(softintr_cookie)
#define setsoftcrypto(x) softintr_schedule(x)
#endif
#define SESID2HID(sid) (((sid) >> 32) & 0xffffffff)
/*
* Crypto drivers register themselves by allocating a slot in the
* crypto_drivers table with crypto_get_driverid() and then registering
* each algorithm they support with crypto_register() and crypto_kregister().
*/
static struct cryptocap *crypto_drivers;
static int crypto_drivers_num;
static void* softintr_cookie;
/*
* There are two queues for crypto requests; one for symmetric (e.g.
* cipher) operations and one for asymmetric (e.g. MOD) operations.
* See below for how synchronization is handled.
*/
static TAILQ_HEAD(,cryptop) crp_q = /* request queues */
TAILQ_HEAD_INITIALIZER(crp_q);
static TAILQ_HEAD(,cryptkop) crp_kq =
TAILQ_HEAD_INITIALIZER(crp_kq);
/*
* There are two queues for processing completed crypto requests; one
* for the symmetric and one for the asymmetric ops. We only need one
* but have two to avoid type futzing (cryptop vs. cryptkop). See below
* for how synchronization is handled.
*/
static TAILQ_HEAD(,cryptop) crp_ret_q = /* callback queues */
TAILQ_HEAD_INITIALIZER(crp_ret_q);
static TAILQ_HEAD(,cryptkop) crp_ret_kq =
TAILQ_HEAD_INITIALIZER(crp_ret_kq);
/*
* Crypto op and desciptor data structures are allocated
* from separate private zones(FreeBSD)/pools(netBSD/OpenBSD) .
*/
struct pool cryptop_pool;
struct pool cryptodesc_pool;
int crypto_pool_initialized = 0;
#ifdef __NetBSD__
static void deferred_crypto_thread(void *arg);
#endif
int crypto_usercrypto = 1; /* userland may open /dev/crypto */
int crypto_userasymcrypto = 1; /* userland may do asym crypto reqs */
/*
* cryptodevallowsoft is (intended to be) sysctl'able, controlling
* access to hardware versus software transforms as below:
*
* crypto_devallowsoft < 0: Force userlevel requests to use software
* transforms, always
* crypto_devallowsoft = 0: Use hardware if present, grant userlevel
* requests for non-accelerated transforms
* (handling the latter in software)
* crypto_devallowsoft > 0: Allow user requests only for transforms which
* are hardware-accelerated.
*/
int crypto_devallowsoft = 1; /* only use hardware crypto */
#ifdef __FreeBSD__
SYSCTL_INT(_kern, OID_AUTO, usercrypto, CTLFLAG_RW,
&crypto_usercrypto, 0,
"Enable/disable user-mode access to crypto support");
SYSCTL_INT(_kern, OID_AUTO, userasymcrypto, CTLFLAG_RW,
&crypto_userasymcrypto, 0,
"Enable/disable user-mode access to asymmetric crypto support");
SYSCTL_INT(_kern, OID_AUTO, cryptodevallowsoft, CTLFLAG_RW,
&crypto_devallowsoft, 0,
"Enable/disable use of software asym crypto support");
#endif
#ifdef __NetBSD__
SYSCTL_SETUP(sysctl_opencrypto_setup, "sysctl opencrypto subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "kern", NULL,
NULL, 0, NULL, 0,
CTL_KERN, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "usercrypto",
SYSCTL_DESCR("Enable/disable user-mode access to "
"crypto support"),
NULL, 0, &crypto_usercrypto, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "userasymcrypto",
SYSCTL_DESCR("Enable/disable user-mode access to "
"asymmetric crypto support"),
NULL, 0, &crypto_userasymcrypto, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "cryptodevallowsoft",
SYSCTL_DESCR("Enable/disable use of software "
"asymmetric crypto support"),
NULL, 0, &crypto_devallowsoft, 0,
CTL_KERN, CTL_CREATE, CTL_EOL);
}
#endif
MALLOC_DEFINE(M_CRYPTO_DATA, "crypto", "crypto session records");
/*
* Synchronization: read carefully, this is non-trivial.
*
* Crypto requests are submitted via crypto_dispatch. Typically
* these come in from network protocols at spl0 (output path) or
* spl[,soft]net (input path).
*
* Requests are typically passed on the driver directly, but they
* may also be queued for processing by a software interrupt thread,
* cryptointr, that runs at splsoftcrypto. This thread dispatches
* the requests to crypto drivers (h/w or s/w) who call crypto_done
* when a request is complete. Hardware crypto drivers are assumed
* to register their IRQ's as network devices so their interrupt handlers
* and subsequent "done callbacks" happen at spl[imp,net].
*
* Completed crypto ops are queued for a separate kernel thread that
* handles the callbacks at spl0. This decoupling insures the crypto
* driver interrupt service routine is not delayed while the callback
* takes place and that callbacks are delivered after a context switch
* (as opposed to a software interrupt that clients must block).
*
* This scheme is not intended for SMP machines.
*/
static void cryptointr(void); /* swi thread to dispatch ops */
static void cryptoret(void); /* kernel thread for callbacks*/
static struct proc *cryptoproc;
static void crypto_destroy(void);
static int crypto_invoke(struct cryptop *crp, int hint);
static int crypto_kinvoke(struct cryptkop *krp, int hint);
static struct cryptostats cryptostats;
static int crypto_timing = 0;
#ifdef __FreeBSD__
SYSCTL_STRUCT(_kern, OID_AUTO, crypto_stats, CTLFLAG_RW, &cryptostats,
cryptostats, "Crypto system statistics");
SYSCTL_INT(_debug, OID_AUTO, crypto_timing, CTLFLAG_RW,
&crypto_timing, 0, "Enable/disable crypto timing support");
SYSCTL_STRUCT(_kern, OID_AUTO, crypto_stats, CTLFLAG_RW, &cryptostats,
cryptostats, "Crypto system statistics");
#endif /* __FreeBSD__ */
static int
crypto_init0(void)
{
#ifdef __FreeBSD__
int error;
cryptop_zone = zinit("cryptop", sizeof (struct cryptop), 0, 0, 1);
cryptodesc_zone = zinit("cryptodesc", sizeof (struct cryptodesc),
0, 0, 1);
if (cryptodesc_zone == NULL || cryptop_zone == NULL) {
printf("crypto_init: cannot setup crypto zones\n");
return;
}
#endif
crypto_drivers = malloc(CRYPTO_DRIVERS_INITIAL *
sizeof(struct cryptocap), M_CRYPTO_DATA, M_NOWAIT | M_ZERO);
if (crypto_drivers == NULL) {
printf("crypto_init: cannot malloc driver table\n");
return 0;
}
crypto_drivers_num = CRYPTO_DRIVERS_INITIAL;
softintr_cookie = register_swi(SWI_CRYPTO, cryptointr);
#ifdef __FreeBSD__
error = kthread_create((void (*)(void *)) cryptoret, NULL,
&cryptoproc, "cryptoret");
if (error) {
printf("crypto_init: cannot start cryptoret thread; error %d",
error);
crypto_destroy();
}
#else
/* defer thread creation until after boot */
kthread_create( deferred_crypto_thread, NULL);
#endif
return 0;
}
void
crypto_init(void)
{
static ONCE_DECL(crypto_init_once);
RUN_ONCE(&crypto_init_once, crypto_init0);
}
static void
crypto_destroy(void)
{
/* XXX no wait to reclaim zones */
if (crypto_drivers != NULL)
free(crypto_drivers, M_CRYPTO_DATA);
unregister_swi(SWI_CRYPTO, cryptointr);
}
/*
* Create a new session.
*/
int
crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int hard)
{
struct cryptoini *cr;
u_int32_t hid, lid;
int err = EINVAL;
int s;
s = splcrypto();
if (crypto_drivers == NULL)
goto done;
/*
* The algorithm we use here is pretty stupid; just use the
* first driver that supports all the algorithms we need.
*
* XXX We need more smarts here (in real life too, but that's
* XXX another story altogether).
*/
for (hid = 0; hid < crypto_drivers_num; hid++) {
/*
* If it's not initialized or has remaining sessions
* referencing it, skip.
*/
if (crypto_drivers[hid].cc_newsession == NULL ||
(crypto_drivers[hid].cc_flags & CRYPTOCAP_F_CLEANUP))
continue;
/* Hardware required -- ignore software drivers. */
if (hard > 0 &&
(crypto_drivers[hid].cc_flags & CRYPTOCAP_F_SOFTWARE))
continue;
/* Software required -- ignore hardware drivers. */
if (hard < 0 &&
(crypto_drivers[hid].cc_flags & CRYPTOCAP_F_SOFTWARE) == 0)
continue;
/* See if all the algorithms are supported. */
for (cr = cri; cr; cr = cr->cri_next)
if (crypto_drivers[hid].cc_alg[cr->cri_alg] == 0)
break;
if (cr == NULL) {
/* Ok, all algorithms are supported. */
/*
* Can't do everything in one session.
*
* XXX Fix this. We need to inject a "virtual" session layer right
* XXX about here.
*/
/* Call the driver initialization routine. */
lid = hid; /* Pass the driver ID. */
err = crypto_drivers[hid].cc_newsession(
crypto_drivers[hid].cc_arg, &lid, cri);
if (err == 0) {
(*sid) = hid;
(*sid) <<= 32;
(*sid) |= (lid & 0xffffffff);
crypto_drivers[hid].cc_sessions++;
}
goto done;
/*break;*/
}
}
done:
splx(s);
return err;
}
/*
* Delete an existing session (or a reserved session on an unregistered
* driver).
*/
int
crypto_freesession(u_int64_t sid)
{
u_int32_t hid;
int err = 0;
int s;
s = splcrypto();
if (crypto_drivers == NULL) {
err = EINVAL;
goto done;
}
/* Determine two IDs. */
hid = SESID2HID(sid);
if (hid >= crypto_drivers_num) {
err = ENOENT;
goto done;
}
if (crypto_drivers[hid].cc_sessions)
crypto_drivers[hid].cc_sessions--;
/* Call the driver cleanup routine, if available. */
if (crypto_drivers[hid].cc_freesession)
err = crypto_drivers[hid].cc_freesession(
crypto_drivers[hid].cc_arg, sid);
else
err = 0;
/*
* If this was the last session of a driver marked as invalid,
* make the entry available for reuse.
*/
if ((crypto_drivers[hid].cc_flags & CRYPTOCAP_F_CLEANUP) &&
crypto_drivers[hid].cc_sessions == 0)
bzero(&crypto_drivers[hid], sizeof(struct cryptocap));
done:
splx(s);
return err;
}
/*
* Return an unused driver id. Used by drivers prior to registering
* support for the algorithms they handle.
*/
int32_t
crypto_get_driverid(u_int32_t flags)
{
struct cryptocap *newdrv;
int i, s;
crypto_init();
s = splcrypto();
for (i = 0; i < crypto_drivers_num; i++)
if (crypto_drivers[i].cc_process == NULL &&
(crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) == 0 &&
crypto_drivers[i].cc_sessions == 0)
break;
/* Out of entries, allocate some more. */
if (i == crypto_drivers_num) {
/* Be careful about wrap-around. */
if (2 * crypto_drivers_num <= crypto_drivers_num) {
splx(s);
printf("crypto: driver count wraparound!\n");
return -1;
}
newdrv = malloc(2 * crypto_drivers_num *
sizeof(struct cryptocap), M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
if (newdrv == NULL) {
splx(s);
printf("crypto: no space to expand driver table!\n");
return -1;
}
bcopy(crypto_drivers, newdrv,
crypto_drivers_num * sizeof(struct cryptocap));
crypto_drivers_num *= 2;
free(crypto_drivers, M_CRYPTO_DATA);
crypto_drivers = newdrv;
}
/* NB: state is zero'd on free */
crypto_drivers[i].cc_sessions = 1; /* Mark */
crypto_drivers[i].cc_flags = flags;
if (bootverbose)
printf("crypto: assign driver %u, flags %u\n", i, flags);
splx(s);
return i;
}
static struct cryptocap *
crypto_checkdriver(u_int32_t hid)
{
if (crypto_drivers == NULL)
return NULL;
return (hid >= crypto_drivers_num ? NULL : &crypto_drivers[hid]);
}
/*
* Register support for a key-related algorithm. This routine
* is called once for each algorithm supported a driver.
*/
int
crypto_kregister(u_int32_t driverid, int kalg, u_int32_t flags,
int (*kprocess)(void*, struct cryptkop *, int),
void *karg)
{
int s;
struct cryptocap *cap;
int err;
s = splcrypto();
cap = crypto_checkdriver(driverid);
if (cap != NULL &&
(CRK_ALGORITM_MIN <= kalg && kalg <= CRK_ALGORITHM_MAX)) {
/*
* XXX Do some performance testing to determine placing.
* XXX We probably need an auxiliary data structure that
* XXX describes relative performances.
*/
cap->cc_kalg[kalg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
if (bootverbose)
printf("crypto: driver %u registers key alg %u flags %u\n"
, driverid
, kalg
, flags
);
if (cap->cc_kprocess == NULL) {
cap->cc_karg = karg;
cap->cc_kprocess = kprocess;
}
err = 0;
} else
err = EINVAL;
splx(s);
return err;
}
/*
* Register support for a non-key-related algorithm. This routine
* is called once for each such algorithm supported by a driver.
*/
int
crypto_register(u_int32_t driverid, int alg, u_int16_t maxoplen,
u_int32_t flags,
int (*newses)(void*, u_int32_t*, struct cryptoini*),
int (*freeses)(void*, u_int64_t),
int (*process)(void*, struct cryptop *, int),
void *arg)
{
struct cryptocap *cap;
int s, err;
s = splcrypto();
cap = crypto_checkdriver(driverid);
/* NB: algorithms are in the range [1..max] */
if (cap != NULL &&
(CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX)) {
/*
* XXX Do some performance testing to determine placing.
* XXX We probably need an auxiliary data structure that
* XXX describes relative performances.
*/
cap->cc_alg[alg] = flags | CRYPTO_ALG_FLAG_SUPPORTED;
cap->cc_max_op_len[alg] = maxoplen;
if (bootverbose)
printf("crypto: driver %u registers alg %u flags %u maxoplen %u\n"
, driverid
, alg
, flags
, maxoplen
);
if (cap->cc_process == NULL) {
cap->cc_arg = arg;
cap->cc_newsession = newses;
cap->cc_process = process;
cap->cc_freesession = freeses;
cap->cc_sessions = 0; /* Unmark */
}
err = 0;
} else
err = EINVAL;
splx(s);
return err;
}
/*
* Unregister a crypto driver. If there are pending sessions using it,
* leave enough information around so that subsequent calls using those
* sessions will correctly detect the driver has been unregistered and
* reroute requests.
*/
int
crypto_unregister(u_int32_t driverid, int alg)
{
int i, err, s;
u_int32_t ses;
struct cryptocap *cap;
s = splcrypto();
cap = crypto_checkdriver(driverid);
if (cap != NULL &&
(CRYPTO_ALGORITHM_MIN <= alg && alg <= CRYPTO_ALGORITHM_MAX) &&
cap->cc_alg[alg] != 0) {
cap->cc_alg[alg] = 0;
cap->cc_max_op_len[alg] = 0;
/* Was this the last algorithm ? */
for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++)
if (cap->cc_alg[i] != 0)
break;
if (i == CRYPTO_ALGORITHM_MAX + 1) {
ses = cap->cc_sessions;
bzero(cap, sizeof(struct cryptocap));
if (ses != 0) {
/*
* If there are pending sessions, just mark as invalid.
*/
cap->cc_flags |= CRYPTOCAP_F_CLEANUP;
cap->cc_sessions = ses;
}
}
err = 0;
} else
err = EINVAL;
splx(s);
return err;
}
/*
* Unregister all algorithms associated with a crypto driver.
* If there are pending sessions using it, leave enough information
* around so that subsequent calls using those sessions will
* correctly detect the driver has been unregistered and reroute
* requests.
*/
int
crypto_unregister_all(u_int32_t driverid)
{
int i, err, s = splcrypto();
u_int32_t ses;
struct cryptocap *cap;
cap = crypto_checkdriver(driverid);
if (cap != NULL) {
for (i = CRYPTO_ALGORITHM_MIN; i <= CRYPTO_ALGORITHM_MAX; i++) {
cap->cc_alg[i] = 0;
cap->cc_max_op_len[i] = 0;
}
ses = cap->cc_sessions;
bzero(cap, sizeof(struct cryptocap));
if (ses != 0) {
/*
* If there are pending sessions, just mark as invalid.
*/
cap->cc_flags |= CRYPTOCAP_F_CLEANUP;
cap->cc_sessions = ses;
}
err = 0;
} else
err = EINVAL;
splx(s);
return err;
}
/*
* Clear blockage on a driver. The what parameter indicates whether
* the driver is now ready for cryptop's and/or cryptokop's.
*/
int
crypto_unblock(u_int32_t driverid, int what)
{
struct cryptocap *cap;
int needwakeup, err, s;
s = splcrypto();
cap = crypto_checkdriver(driverid);
if (cap != NULL) {
needwakeup = 0;
if (what & CRYPTO_SYMQ) {
needwakeup |= cap->cc_qblocked;
cap->cc_qblocked = 0;
}
if (what & CRYPTO_ASYMQ) {
needwakeup |= cap->cc_kqblocked;
cap->cc_kqblocked = 0;
}
if (needwakeup) {
setsoftcrypto(softintr_cookie);
}
err = 0;
} else
err = EINVAL;
splx(s);
return err;
}
/*
* Dispatch a crypto request to a driver or queue
* it, to be processed by the kernel thread.
*/
int
crypto_dispatch(struct cryptop *crp)
{
u_int32_t hid = SESID2HID(crp->crp_sid);
int s, result;
s = splcrypto();
cryptostats.cs_ops++;
#ifdef CRYPTO_TIMING
if (crypto_timing)
nanouptime(&crp->crp_tstamp);
#endif
if ((crp->crp_flags & CRYPTO_F_BATCH) == 0) {
struct cryptocap *cap;
/*
* Caller marked the request to be processed
* immediately; dispatch it directly to the
* driver unless the driver is currently blocked.
*/
cap = crypto_checkdriver(hid);
if (cap && !cap->cc_qblocked) {
result = crypto_invoke(crp, 0);
if (result == ERESTART) {
/*
* The driver ran out of resources, mark the
* driver ``blocked'' for cryptop's and put
* the op on the queue.
*/
crypto_drivers[hid].cc_qblocked = 1;
TAILQ_INSERT_HEAD(&crp_q, crp, crp_next);
cryptostats.cs_blocks++;
}
} else {
/*
* The driver is blocked, just queue the op until
* it unblocks and the swi thread gets kicked.
*/
TAILQ_INSERT_TAIL(&crp_q, crp, crp_next);
result = 0;
}
} else {
int wasempty = TAILQ_EMPTY(&crp_q);
/*
* Caller marked the request as ``ok to delay'';
* queue it for the swi thread. This is desirable
* when the operation is low priority and/or suitable
* for batching.
*/
TAILQ_INSERT_TAIL(&crp_q, crp, crp_next);
if (wasempty) {
setsoftcrypto(softintr_cookie);
}
result = 0;
}
splx(s);
return result;
}
/*
* Add an asymetric crypto request to a queue,
* to be processed by the kernel thread.
*/
int
crypto_kdispatch(struct cryptkop *krp)
{
struct cryptocap *cap;
int s, result;
s = splcrypto();
cryptostats.cs_kops++;
cap = crypto_checkdriver(krp->krp_hid);
if (cap && !cap->cc_kqblocked) {
result = crypto_kinvoke(krp, 0);
if (result == ERESTART) {
/*
* The driver ran out of resources, mark the
* driver ``blocked'' for cryptop's and put
* the op on the queue.
*/
crypto_drivers[krp->krp_hid].cc_kqblocked = 1;
TAILQ_INSERT_HEAD(&crp_kq, krp, krp_next);
cryptostats.cs_kblocks++;
}
} else {
/*
* The driver is blocked, just queue the op until
* it unblocks and the swi thread gets kicked.
*/
TAILQ_INSERT_TAIL(&crp_kq, krp, krp_next);
result = 0;
}
splx(s);
return result;
}
/*
* Dispatch an assymetric crypto request to the appropriate crypto devices.
*/
static int
crypto_kinvoke(struct cryptkop *krp, int hint)
{
u_int32_t hid;
int error;
/* Sanity checks. */
if (krp == NULL)
return EINVAL;
if (krp->krp_callback == NULL) {
free(krp, M_XDATA); /* XXX allocated in cryptodev */
return EINVAL;
}
for (hid = 0; hid < crypto_drivers_num; hid++) {
if ((crypto_drivers[hid].cc_flags & CRYPTOCAP_F_SOFTWARE) &&
crypto_devallowsoft == 0)
continue;
if (crypto_drivers[hid].cc_kprocess == NULL)
continue;
if ((crypto_drivers[hid].cc_kalg[krp->krp_op] &
CRYPTO_ALG_FLAG_SUPPORTED) == 0)
continue;
break;
}
if (hid < crypto_drivers_num) {
krp->krp_hid = hid;
error = crypto_drivers[hid].cc_kprocess(
crypto_drivers[hid].cc_karg, krp, hint);
} else {
error = ENODEV;
}
if (error) {
krp->krp_status = error;
crypto_kdone(krp);
}
return 0;
}
#ifdef CRYPTO_TIMING
static void
crypto_tstat(struct cryptotstat *ts, struct timespec *tv)
{
struct timespec now, t;
nanouptime(&now);
t.tv_sec = now.tv_sec - tv->tv_sec;
t.tv_nsec = now.tv_nsec - tv->tv_nsec;
if (t.tv_nsec < 0) {
t.tv_sec--;
t.tv_nsec += 1000000000;
}
timespecadd(&ts->acc, &t, &t);
if (timespeccmp(&t, &ts->min, <))
ts->min = t;
if (timespeccmp(&t, &ts->max, >))
ts->max = t;
ts->count++;
*tv = now;
}
#endif
/*
* Dispatch a crypto request to the appropriate crypto devices.
*/
static int
crypto_invoke(struct cryptop *crp, int hint)
{
u_int32_t hid;
int (*process)(void*, struct cryptop *, int);
#ifdef CRYPTO_TIMING
if (crypto_timing)
crypto_tstat(&cryptostats.cs_invoke, &crp->crp_tstamp);
#endif
/* Sanity checks. */
if (crp == NULL)
return EINVAL;
if (crp->crp_callback == NULL) {
crypto_freereq(crp);
return EINVAL;
}
if (crp->crp_desc == NULL) {
crp->crp_etype = EINVAL;
crypto_done(crp);
return 0;
}
hid = SESID2HID(crp->crp_sid);
if (hid < crypto_drivers_num) {
if (crypto_drivers[hid].cc_flags & CRYPTOCAP_F_CLEANUP)
crypto_freesession(crp->crp_sid);
process = crypto_drivers[hid].cc_process;
} else {
process = NULL;
}
if (process == NULL) {
struct cryptodesc *crd;
u_int64_t nid = 0;
/*
* Driver has unregistered; migrate the session and return
* an error to the caller so they'll resubmit the op.
*/
for (crd = crp->crp_desc; crd->crd_next; crd = crd->crd_next)
crd->CRD_INI.cri_next = &(crd->crd_next->CRD_INI);
if (crypto_newsession(&nid, &(crp->crp_desc->CRD_INI), 0) == 0)
crp->crp_sid = nid;
crp->crp_etype = EAGAIN;
crypto_done(crp);
return 0;
} else {
/*
* Invoke the driver to process the request.
*/
return (*process)(crypto_drivers[hid].cc_arg, crp, hint);
}
}
/*
* Release a set of crypto descriptors.
*/
void
crypto_freereq(struct cryptop *crp)
{
struct cryptodesc *crd;
int s;
if (crp == NULL)
return;
s = splcrypto();
while ((crd = crp->crp_desc) != NULL) {
crp->crp_desc = crd->crd_next;
pool_put(&cryptodesc_pool, crd);
}
pool_put(&cryptop_pool, crp);
splx(s);
}
/*
* Acquire a set of crypto descriptors.
*/
struct cryptop *
crypto_getreq(int num)
{
struct cryptodesc *crd;
struct cryptop *crp;
int s;
s = splcrypto();
if (crypto_pool_initialized == 0) {
pool_init(&cryptop_pool, sizeof(struct cryptop), 0, 0,
0, "cryptop", NULL);
pool_init(&cryptodesc_pool, sizeof(struct cryptodesc), 0, 0,
0, "cryptodesc", NULL);
crypto_pool_initialized = 1;
}
crp = pool_get(&cryptop_pool, 0);
if (crp == NULL) {
splx(s);
return NULL;
}
bzero(crp, sizeof(struct cryptop));
while (num--) {
crd = pool_get(&cryptodesc_pool, 0);
if (crd == NULL) {
splx(s);
crypto_freereq(crp);
return NULL;
}
bzero(crd, sizeof(struct cryptodesc));
crd->crd_next = crp->crp_desc;
crp->crp_desc = crd;
}
splx(s);
return crp;
}
/*
* Invoke the callback on behalf of the driver.
*/
void
crypto_done(struct cryptop *crp)
{
if (crp->crp_etype != 0)
cryptostats.cs_errs++;
#ifdef CRYPTO_TIMING
if (crypto_timing)
crypto_tstat(&cryptostats.cs_done, &crp->crp_tstamp);
#endif
/*
* On netbsd 1.6O, CBIMM does its wake_one() before the requestor
* has done its tsleep().
*/
#ifndef __NetBSD__
if (crp->crp_flags & CRYPTO_F_CBIMM) {
/*
* Do the callback directly. This is ok when the
* callback routine does very little (e.g. the
* /dev/crypto callback method just does a wakeup).
*/
#ifdef CRYPTO_TIMING
if (crypto_timing) {
/*
* NB: We must copy the timestamp before
* doing the callback as the cryptop is
* likely to be reclaimed.
*/
struct timespec t = crp->crp_tstamp;
crypto_tstat(&cryptostats.cs_cb, &t);
crp->crp_callback(crp);
crypto_tstat(&cryptostats.cs_finis, &t);
} else
#endif
crp->crp_callback(crp);
} else
#endif /* __NetBSD__ */
{
int s, wasempty;