156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* This file contains the core framework routines for the
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* kernel cryptographic framework. These routines are at the
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* layer, between the kernel API/ioctls and the SPI.
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*/
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#include <sys/zfs_context.h>
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#include <sys/crypto/common.h>
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#include <sys/crypto/impl.h>
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#include <sys/crypto/sched_impl.h>
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#include <sys/crypto/api.h>
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/* kmem caches used by the scheduler */
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static kmem_cache_t *kcf_context_cache;
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ulong_t kcf_swprov_hndl = 0;
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/*
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* Create a new context.
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*/
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crypto_ctx_t *
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kcf_new_ctx(crypto_call_req_t *crq, kcf_provider_desc_t *pd)
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{
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crypto_ctx_t *ctx;
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kcf_context_t *kcf_ctx;
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kcf_ctx = kmem_cache_alloc(kcf_context_cache,
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(crq == NULL) ? KM_SLEEP : KM_NOSLEEP);
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if (kcf_ctx == NULL)
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return (NULL);
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/* initialize the context for the consumer */
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kcf_ctx->kc_refcnt = 1;
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KCF_PROV_REFHOLD(pd);
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kcf_ctx->kc_prov_desc = pd;
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kcf_ctx->kc_sw_prov_desc = NULL;
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ctx = &kcf_ctx->kc_glbl_ctx;
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ctx->cc_provider = pd->pd_prov_handle;
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ctx->cc_provider_private = NULL;
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ctx->cc_framework_private = (void *)kcf_ctx;
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return (ctx);
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}
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/*
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* We're done with this framework context, so free it. Note that freeing
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* framework context (kcf_context) frees the global context (crypto_ctx).
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*
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* The provider is responsible for freeing provider private context after a
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* final or single operation and resetting the cc_provider_private field
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* to NULL. It should do this before it notifies the framework of the
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* completion. We still need to call KCF_PROV_FREE_CONTEXT to handle cases
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* like crypto_cancel_ctx(9f).
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*/
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void
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kcf_free_context(kcf_context_t *kcf_ctx)
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{
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kcf_provider_desc_t *pd = kcf_ctx->kc_prov_desc;
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crypto_ctx_t *gctx = &kcf_ctx->kc_glbl_ctx;
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if (gctx->cc_provider_private != NULL) {
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mutex_enter(&pd->pd_lock);
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if (!KCF_IS_PROV_REMOVED(pd)) {
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/*
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* Increment the provider's internal refcnt so it
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* doesn't unregister from the framework while
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* we're calling the entry point.
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*/
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KCF_PROV_IREFHOLD(pd);
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mutex_exit(&pd->pd_lock);
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(void) KCF_PROV_FREE_CONTEXT(pd, gctx);
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KCF_PROV_IREFRELE(pd);
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} else {
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mutex_exit(&pd->pd_lock);
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}
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}
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/* kcf_ctx->kc_prov_desc has a hold on pd */
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KCF_PROV_REFRELE(kcf_ctx->kc_prov_desc);
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kmem_cache_free(kcf_context_cache, kcf_ctx);
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}
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/*
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* kmem_cache_alloc constructor for kcf_context structure.
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*/
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static int
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kcf_context_cache_constructor(void *buf, void *cdrarg, int kmflags)
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{
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(void) cdrarg, (void) kmflags;
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kcf_context_t *kctx = (kcf_context_t *)buf;
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kctx->kc_refcnt = 0;
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return (0);
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}
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static void
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kcf_context_cache_destructor(void *buf, void *cdrarg)
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{
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(void) cdrarg;
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kcf_context_t *kctx = (kcf_context_t *)buf;
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ASSERT(kctx->kc_refcnt == 0);
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}
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void
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kcf_sched_destroy(void)
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{
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if (kcf_context_cache)
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kmem_cache_destroy(kcf_context_cache);
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}
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/*
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* Creates and initializes all the structures needed by the framework.
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*/
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void
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kcf_sched_init(void)
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{
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/*
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* Create all the kmem caches needed by the framework. We set the
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* align argument to 64, to get a slab aligned to 64-byte as well as
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* have the objects (cache_chunksize) to be a 64-byte multiple.
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* This helps to avoid false sharing as this is the size of the
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* CPU cache line.
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*/
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kcf_context_cache = kmem_cache_create("kcf_context_cache",
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sizeof (struct kcf_context), 64, kcf_context_cache_constructor,
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kcf_context_cache_destructor, NULL, NULL, NULL, 0);
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}
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