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|
/* $OpenBSD: crypto.c,v 1.14 2000/09/07 18:44:29 deraadt 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 Angelos D. Keromytis
*
* Permission to use, copy, and modify this software 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/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/md5k.h>
#include <dev/rndvar.h>
#include <crypto/sha1.h>
#include <crypto/rmd160.h>
#include <crypto/cast.h>
#include <crypto/skipjack.h>
#include <crypto/blf.h>
#include <crypto/crypto.h>
#include <crypto/xform.h>
struct cryptocap *crypto_drivers = NULL;
int crypto_drivers_num = 0;
struct cryptop *cryptop_queue = NULL;
struct cryptodesc *cryptodesc_queue = NULL;
int crypto_queue_num = 0;
int crypto_queue_max = CRYPTO_MAX_CACHED;
struct cryptop *crp_req_queue = NULL;
struct cryptop **crp_req_queue_tail = NULL;
/*
* Create a new session.
*/
int
crypto_newsession(u_int64_t *sid, struct cryptoini *cri)
{
struct cryptoini *cr;
u_int32_t hid, lid;
int err;
if (crypto_drivers == NULL)
return EINVAL;
/*
* 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;
/* 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;
/* Ok, all algorithms are supported */
if (cr == NULL)
break;
}
/*
* Can't do everything in one session.
*
* XXX Fix this. We need to inject a "virtual" session layer right
* XXX about here.
*/
if (hid == crypto_drivers_num)
return EINVAL;
/* Call the driver initialization routine */
lid = hid; /* Pass the driver ID */
err = crypto_drivers[hid].cc_newsession(&lid, cri);
if (err == 0)
{
(*sid) = hid;
(*sid) <<= 31;
(*sid) |= (lid & 0xffffffff);
crypto_drivers[hid].cc_sessions++;
}
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;
if (crypto_drivers == NULL)
return EINVAL;
/* Determine two IDs */
hid = (sid >> 31) & 0xffffffff;
if (hid >= crypto_drivers_num)
return ENOENT;
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(sid);
/*
* 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));
return err;
}
/*
* Find an empty slot.
*/
int32_t
crypto_get_driverid(void)
{
struct cryptocap *newdrv;
int i;
if (crypto_drivers_num == 0)
{
crypto_drivers_num = CRYPTO_DRIVERS_INITIAL;
crypto_drivers = malloc(crypto_drivers_num * sizeof(struct cryptocap),
M_XDATA, M_NOWAIT);
if (crypto_drivers == NULL)
{
crypto_drivers_num = 0;
return -1;
}
bzero(crypto_drivers, crypto_drivers_num * sizeof(struct cryptocap));
}
for (i = 0; i < crypto_drivers_num; i++)
if ((crypto_drivers[i].cc_process == NULL) &&
!(crypto_drivers[i].cc_flags & CRYPTOCAP_F_CLEANUP) &&
(crypto_drivers[i].cc_sessions == 0))
return i;
/* Out of entries, allocate some more */
if (i == crypto_drivers_num)
{
/* Be careful about wrap-around */
if (2 * crypto_drivers_num <= crypto_drivers_num)
return -1;
newdrv = malloc(2 * crypto_drivers_num * sizeof(struct cryptocap),
M_XDATA, M_NOWAIT);
if (newdrv == NULL)
return -1;
bcopy(crypto_drivers, newdrv,
crypto_drivers_num * sizeof(struct cryptocap));
bzero(&newdrv[crypto_drivers_num],
crypto_drivers_num * sizeof(struct cryptocap));
crypto_drivers_num *= 2;
return i;
}
/* Shouldn't really get here... */
return -1;
}
/*
* Register a crypto driver. It should be called once for each algorithm
* supported by the driver.
*/
int
crypto_register(u_int32_t driverid, int alg,
int (*newses)(u_int32_t *, struct cryptoini *),
int (*freeses)(u_int64_t), int (*process)(struct cryptop *))
{
if ((driverid >= crypto_drivers_num) || (alg <= 0) ||
(alg > CRYPTO_ALGORITHM_MAX) || (crypto_drivers == NULL))
return EINVAL;
/*
* XXX Do some performance testing to determine placing.
* XXX We probably need an auxiliary data structure that describes
* XXX relative performances.
*/
crypto_drivers[driverid].cc_alg[alg] = 1;
if (crypto_drivers[driverid].cc_process == NULL)
{
crypto_drivers[driverid].cc_newsession = newses;
crypto_drivers[driverid].cc_process = process;
crypto_drivers[driverid].cc_freesession = freeses;
}
return 0;
}
/*
* 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 being unregistered and reroute
* the request.
*/
int
crypto_unregister(u_int32_t driverid, int alg)
{
u_int32_t ses;
int i;
/* Sanity checks */
if ((driverid >= crypto_drivers_num) || (alg <= 0) ||
(alg > CRYPTO_ALGORITHM_MAX) || (crypto_drivers == NULL) ||
(crypto_drivers[driverid].cc_alg[alg] == 0))
return EINVAL;
crypto_drivers[driverid].cc_alg[alg] = 0;
/* Was this the last algorithm ? */
for (i = 1; i <= CRYPTO_ALGORITHM_MAX; i++)
if (crypto_drivers[driverid].cc_alg[i] != 0)
break;
if (i == CRYPTO_ALGORITHM_MAX + 1)
{
ses = crypto_drivers[driverid].cc_sessions;
bzero(&crypto_drivers[driverid], sizeof(struct cryptocap));
if (ses != 0)
{
/* If there are pending sessions, just mark as invalid */
crypto_drivers[driverid].cc_flags |= CRYPTOCAP_F_CLEANUP;
crypto_drivers[driverid].cc_sessions = ses;
}
}
return 0;
}
/*
* Add crypto request to a queue, to be processed by a kernel thread.
*/
int
crypto_dispatch(struct cryptop *crp)
{
int s = splhigh();
if (crp_req_queue == NULL) {
crp_req_queue = crp;
crp_req_queue_tail = &(crp->crp_next);
wakeup((caddr_t) &crp_req_queue);
} else {
*crp_req_queue_tail = crp;
crp_req_queue_tail = &(crp->crp_next);
}
splx(s);
return 0;
}
/*
* Dispatch a crypto request to the appropriate crypto devices.
*/
int
crypto_invoke(struct cryptop *crp)
{
struct cryptodesc *crd;
u_int64_t nid;
u_int32_t hid;
/* Sanity checks */
if ((crp == NULL) || (crp->crp_callback == NULL))
return EINVAL;
if ((crp->crp_desc == NULL) || (crypto_drivers == NULL))
{
crp->crp_etype = EINVAL;
crypto_done(crp);
return 0;
}
hid = (crp->crp_sid >> 31) & 0xffffffff;
if (hid >= crypto_drivers_num)
{
/* Migrate session */
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)
crp->crp_sid = nid;
crp->crp_etype = EAGAIN;
crypto_done(crp);
return 0;
}
if (crypto_drivers[hid].cc_flags & CRYPTOCAP_F_CLEANUP)
crypto_freesession(crp->crp_sid);
if (crypto_drivers[hid].cc_process == NULL)
{
/* Migrate session */
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)
crp->crp_sid = nid;
crp->crp_etype = EAGAIN;
crypto_done(crp);
return 0;
}
crypto_drivers[hid].cc_process(crp);
return 0;
}
/*
* Release a set of crypto descriptors.
*/
void
crypto_freereq(struct cryptop *crp)
{
struct cryptodesc *crd;
int s;
if (crp == NULL)
return;
s = splhigh();
while ((crd = crp->crp_desc) != NULL)
{
crp->crp_desc = crd->crd_next;
if (crypto_queue_num + 1 > crypto_queue_max)
FREE(crd, M_XDATA);
else
{
crd->crd_next = cryptodesc_queue;
cryptodesc_queue = crd;
crypto_queue_num++;
}
}
if (crypto_queue_num + 1 > crypto_queue_max)
FREE(crp, M_XDATA);
else
{
crp->crp_next = cryptop_queue;
cryptop_queue = crp;
crypto_queue_num++;
}
splx(s);
}
/*
* Acquire a set of crypto descriptors.
*/
struct cryptop *
crypto_getreq(int num)
{
struct cryptodesc *crd;
struct cryptop *crp;
int s = splhigh();
if (cryptop_queue == NULL)
{
MALLOC(crp, struct cryptop *, sizeof(struct cryptop), M_XDATA,
M_NOWAIT);
if (crp == NULL)
{
splx(s);
return NULL;
}
}
else
{
crp = cryptop_queue;
cryptop_queue = crp->crp_next;
crypto_queue_num--;
}
bzero(crp, sizeof(struct cryptop));
while (num--)
{
if (cryptodesc_queue == NULL)
{
MALLOC(crd, struct cryptodesc *, sizeof(struct cryptodesc),
M_XDATA, M_NOWAIT);
if (crd == NULL)
{
splx(s);
crypto_freereq(crp);
return NULL;
}
}
else
{
crd = cryptodesc_queue;
cryptodesc_queue = crd->crd_next;
crypto_queue_num--;
}
bzero(crd, sizeof(struct cryptodesc));
crd->crd_next = crp->crp_desc;
crp->crp_desc = crd;
}
splx(s);
return crp;
}
/*
* Crypto thread, runs as a kernel thread to process crypto requests.
*/
void
crypto_thread(void)
{
struct cryptop *crp;
int s;
s = splhigh();
for (;;)
{
crp = crp_req_queue;
if (crp == NULL) /* No work to do */
{
(void) tsleep(&crp_req_queue, PLOCK, "crypto_wait", 0);
continue;
}
/* Remove from the queue */
crp_req_queue = crp->crp_next;
splx(s);
crypto_invoke(crp);
s = splhigh();
}
}
/*
* Invoke the callback on behalf of the driver.
*/
void
crypto_done(struct cryptop *crp)
{
crp->crp_callback(crp);
}
|