1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*
* 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 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);
}
|
