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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 http://www.opensolaris.org/os/licensing.
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* This file contains the core framework routines for the
* kernel cryptographic framework. These routines are at the
* layer, between the kernel API/ioctls and the SPI.
*/
#include <sys/zfs_context.h>
#include <sys/crypto/common.h>
#include <sys/crypto/impl.h>
#include <sys/crypto/sched_impl.h>
#include <sys/crypto/api.h>
/* kmem caches used by the scheduler */
static kmem_cache_t *kcf_context_cache;
/*
* Create a new context.
*/
crypto_ctx_t *
kcf_new_ctx(kcf_provider_desc_t *pd)
{
crypto_ctx_t *ctx;
kcf_context_t *kcf_ctx;
kcf_ctx = kmem_cache_alloc(kcf_context_cache, KM_SLEEP);
if (kcf_ctx == NULL)
return (NULL);
/* initialize the context for the consumer */
kcf_ctx->kc_refcnt = 1;
KCF_PROV_REFHOLD(pd);
kcf_ctx->kc_prov_desc = pd;
kcf_ctx->kc_sw_prov_desc = NULL;
ctx = &kcf_ctx->kc_glbl_ctx;
ctx->cc_provider_private = NULL;
ctx->cc_framework_private = (void *)kcf_ctx;
return (ctx);
}
/*
* We're done with this framework context, so free it. Note that freeing
* framework context (kcf_context) frees the global context (crypto_ctx).
*
* The provider is responsible for freeing provider private context after a
* final or single operation and resetting the cc_provider_private field
* to NULL. It should do this before it notifies the framework of the
* completion. We still need to call KCF_PROV_FREE_CONTEXT to handle cases
* like crypto_cancel_ctx(9f).
*/
void
kcf_free_context(kcf_context_t *kcf_ctx)
{
kcf_provider_desc_t *pd = kcf_ctx->kc_prov_desc;
crypto_ctx_t *gctx = &kcf_ctx->kc_glbl_ctx;
if (gctx->cc_provider_private != NULL) {
mutex_enter(&pd->pd_lock);
if (!KCF_IS_PROV_REMOVED(pd)) {
/*
* Increment the provider's internal refcnt so it
* doesn't unregister from the framework while
* we're calling the entry point.
*/
KCF_PROV_IREFHOLD(pd);
mutex_exit(&pd->pd_lock);
(void) KCF_PROV_FREE_CONTEXT(pd, gctx);
KCF_PROV_IREFRELE(pd);
} else {
mutex_exit(&pd->pd_lock);
}
}
/* kcf_ctx->kc_prov_desc has a hold on pd */
KCF_PROV_REFRELE(kcf_ctx->kc_prov_desc);
kmem_cache_free(kcf_context_cache, kcf_ctx);
}
/*
* kmem_cache_alloc constructor for kcf_context structure.
*/
static int
kcf_context_cache_constructor(void *buf, void *cdrarg, int kmflags)
{
(void) cdrarg, (void) kmflags;
kcf_context_t *kctx = (kcf_context_t *)buf;
kctx->kc_refcnt = 0;
return (0);
}
static void
kcf_context_cache_destructor(void *buf, void *cdrarg)
{
(void) cdrarg;
kcf_context_t *kctx = (kcf_context_t *)buf;
ASSERT(kctx->kc_refcnt == 0);
}
void
kcf_sched_destroy(void)
{
if (kcf_context_cache)
kmem_cache_destroy(kcf_context_cache);
}
/*
* Creates and initializes all the structures needed by the framework.
*/
void
kcf_sched_init(void)
{
/*
* Create all the kmem caches needed by the framework. We set the
* align argument to 64, to get a slab aligned to 64-byte as well as
* have the objects (cache_chunksize) to be a 64-byte multiple.
* This helps to avoid false sharing as this is the size of the
* CPU cache line.
*/
kcf_context_cache = kmem_cache_create("kcf_context_cache",
sizeof (struct kcf_context), 64, kcf_context_cache_constructor,
kcf_context_cache_destructor, NULL, NULL, NULL, 0);
}
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