Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Create default crypto algorithm instances.
3 *
4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/crypto.h>
14#include <linux/ctype.h>
15#include <linux/err.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/notifier.h>
19#include <linux/rtnetlink.h>
20#include <linux/sched.h>
21#include <linux/string.h>
22#include <linux/workqueue.h>
23
24#include "internal.h"
25
26struct cryptomgr_param {
27 struct work_struct work;
28
29 struct {
30 struct rtattr attr;
31 struct crypto_attr_alg data;
32 } alg;
33
34 struct {
35 u32 type;
36 u32 mask;
37 char name[CRYPTO_MAX_ALG_NAME];
38 } larval;
39
40 char template[CRYPTO_MAX_ALG_NAME];
41};
42
43static void cryptomgr_probe(void *data)
44{
45 struct cryptomgr_param *param = data;
46 struct crypto_template *tmpl;
47 struct crypto_instance *inst;
48 int err;
49
50 tmpl = crypto_lookup_template(param->template);
51 if (!tmpl)
52 goto err;
53
54 do {
55 inst = tmpl->alloc(¶m->alg, sizeof(param->alg));
56 if (IS_ERR(inst))
57 err = PTR_ERR(inst);
58 else if ((err = crypto_register_instance(tmpl, inst)))
59 tmpl->free(inst);
60 } while (err == -EAGAIN && !signal_pending(current));
61
62 crypto_tmpl_put(tmpl);
63
64 if (err)
65 goto err;
66
67out:
68 kfree(param);
69 return;
70
71err:
72 crypto_larval_error(param->larval.name, param->larval.type,
73 param->larval.mask);
74 goto out;
75}
76
77static int cryptomgr_schedule_probe(struct crypto_larval *larval)
78{
79 struct cryptomgr_param *param;
80 const char *name = larval->alg.cra_name;
81 const char *p;
82 unsigned int len;
83
84 param = kmalloc(sizeof(*param), GFP_KERNEL);
85 if (!param)
86 goto err;
87
88 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
89 ;
90
91 len = p - name;
92 if (!len || *p != '(')
93 goto err_free_param;
94
95 memcpy(param->template, name, len);
96 param->template[len] = 0;
97
98 name = p + 1;
99 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
100 ;
101
102 len = p - name;
103 if (!len || *p != ')' || p[1])
104 goto err_free_param;
105
106 param->alg.attr.rta_len = sizeof(param->alg);
107 param->alg.attr.rta_type = CRYPTOA_ALG;
108 memcpy(param->alg.data.name, name, len);
109 param->alg.data.name[len] = 0;
110
111 memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
112 param->larval.type = larval->alg.cra_flags;
113 param->larval.mask = larval->mask;
114
115 INIT_WORK(¶m->work, cryptomgr_probe, param);
116 schedule_work(¶m->work);
117
118 return NOTIFY_STOP;
119
120err_free_param:
121 kfree(param);
122err:
123 return NOTIFY_OK;
124}
125
126static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
127 void *data)
128{
129 switch (msg) {
130 case CRYPTO_MSG_ALG_REQUEST:
131 return cryptomgr_schedule_probe(data);
132 }
133
134 return NOTIFY_DONE;
135}
136
137static struct notifier_block cryptomgr_notifier = {
138 .notifier_call = cryptomgr_notify,
139};
140
141static int __init cryptomgr_init(void)
142{
143 return crypto_register_notifier(&cryptomgr_notifier);
144}
145
146static void __exit cryptomgr_exit(void)
147{
148 int err = crypto_unregister_notifier(&cryptomgr_notifier);
149 BUG_ON(err);
150}
151
152module_init(cryptomgr_init);
153module_exit(cryptomgr_exit);
154
155MODULE_LICENSE("GPL");
156MODULE_DESCRIPTION("Crypto Algorithm Manager");