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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/crypto/common.h>
#include <sys/crypto/impl.h>
#include <sys/crypto/sched_impl.h>
void
kcf_free_triedlist(kcf_prov_tried_t *list)
{
kcf_prov_tried_t *l;
while ((l = list) != NULL) {
list = list->pt_next;
KCF_PROV_REFRELE(l->pt_pd);
kmem_free(l, sizeof (kcf_prov_tried_t));
}
}
kcf_prov_tried_t *
kcf_insert_triedlist(kcf_prov_tried_t **list, kcf_provider_desc_t *pd,
int kmflag)
{
kcf_prov_tried_t *l;
l = kmem_alloc(sizeof (kcf_prov_tried_t), kmflag);
if (l == NULL)
return (NULL);
l->pt_pd = pd;
l->pt_next = *list;
*list = l;
return (l);
}
static boolean_t
is_in_triedlist(kcf_provider_desc_t *pd, kcf_prov_tried_t *triedl)
{
while (triedl != NULL) {
if (triedl->pt_pd == pd)
return (B_TRUE);
triedl = triedl->pt_next;
};
return (B_FALSE);
}
/*
* Return the best provider for the specified mechanism. The provider
* is held and it is the caller's responsibility to release it when done.
* The fg input argument is used as a search criterion to pick a provider.
* A provider has to support this function group to be picked.
*
* Find the least loaded provider in the list of providers. We do a linear
* search to find one. This is fine as we assume there are only a few
* number of providers in this list. If this assumption ever changes,
* we should revisit this.
*/
kcf_provider_desc_t *
kcf_get_mech_provider(crypto_mech_type_t mech_type, kcf_mech_entry_t **mepp,
int *error, kcf_prov_tried_t *triedl, crypto_func_group_t fg)
{
kcf_provider_desc_t *pd = NULL;
kcf_prov_mech_desc_t *mdesc;
kcf_ops_class_t class;
int index;
kcf_mech_entry_t *me;
const kcf_mech_entry_tab_t *me_tab;
class = KCF_MECH2CLASS(mech_type);
if ((class < KCF_FIRST_OPSCLASS) || (class > KCF_LAST_OPSCLASS)) {
*error = CRYPTO_MECHANISM_INVALID;
return (NULL);
}
me_tab = &kcf_mech_tabs_tab[class];
index = KCF_MECH2INDEX(mech_type);
if ((index < 0) || (index >= me_tab->met_size)) {
*error = CRYPTO_MECHANISM_INVALID;
return (NULL);
}
me = &((me_tab->met_tab)[index]);
if (mepp != NULL)
*mepp = me;
/* Is there a provider? */
if (pd == NULL && (mdesc = me->me_sw_prov) != NULL) {
pd = mdesc->pm_prov_desc;
if (!IS_FG_SUPPORTED(mdesc, fg) ||
!KCF_IS_PROV_USABLE(pd) ||
IS_PROVIDER_TRIED(pd, triedl))
pd = NULL;
}
if (pd == NULL) {
/*
* We do not want to report CRYPTO_MECH_NOT_SUPPORTED, when
* we are in the "fallback to the next provider" case. Rather
* we preserve the error, so that the client gets the right
* error code.
*/
if (triedl == NULL)
*error = CRYPTO_MECH_NOT_SUPPORTED;
} else
KCF_PROV_REFHOLD(pd);
return (pd);
}
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