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2b8c19db HX |
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/string.h> | |
21 | #include <linux/workqueue.h> | |
22 | ||
23 | #include "internal.h" | |
24 | ||
25 | struct cryptomgr_param { | |
26 | struct work_struct work; | |
27 | ||
28 | struct { | |
29 | struct rtattr attr; | |
30 | struct crypto_attr_alg data; | |
31 | } alg; | |
32 | ||
33 | struct { | |
34 | char name[CRYPTO_MAX_ALG_NAME]; | |
35 | } larval; | |
36 | ||
37 | char template[CRYPTO_MAX_ALG_NAME]; | |
38 | }; | |
39 | ||
40 | static void cryptomgr_probe(void *data) | |
41 | { | |
42 | struct cryptomgr_param *param = data; | |
43 | struct crypto_template *tmpl; | |
44 | struct crypto_instance *inst; | |
45 | ||
46 | tmpl = crypto_lookup_template(param->template); | |
47 | if (!tmpl) | |
48 | goto err; | |
49 | ||
50 | inst = tmpl->alloc(¶m->alg, sizeof(param->alg)); | |
51 | if (IS_ERR(inst)) | |
52 | goto err; | |
53 | else if ((err = crypto_register_instance(tmpl, inst))) { | |
54 | tmpl->free(inst); | |
55 | goto err; | |
56 | } | |
57 | ||
58 | crypto_tmpl_put(tmpl); | |
59 | ||
60 | out: | |
61 | kfree(param); | |
62 | return; | |
63 | ||
64 | err: | |
65 | crypto_larval_error(param->larval.name); | |
66 | goto out; | |
67 | } | |
68 | ||
69 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) | |
70 | { | |
71 | struct cryptomgr_param *param; | |
72 | const char *name = larval->alg.cra_name; | |
73 | const char *p; | |
74 | unsigned int len; | |
75 | ||
76 | param = kmalloc(sizeof(*param), GFP_KERNEL); | |
77 | if (!param) | |
78 | goto err; | |
79 | ||
80 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
81 | ; | |
82 | ||
83 | len = p - name; | |
84 | if (!len || *p != '(') | |
85 | goto err_free_param; | |
86 | ||
87 | memcpy(param->template, name, len); | |
88 | param->template[len] = 0; | |
89 | ||
90 | name = p + 1; | |
91 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
92 | ; | |
93 | ||
94 | len = p - name; | |
95 | if (!len || *p != ')' || p[1]) | |
96 | goto err_free_param; | |
97 | ||
98 | param->alg.attr.rta_len = sizeof(param->alg); | |
99 | param->alg.attr.rta_type = CRYPTOA_ALG; | |
100 | memcpy(param->alg.data.name, name, len); | |
101 | param->alg.data.name[len] = 0; | |
102 | ||
103 | memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); | |
104 | ||
105 | INIT_WORK(¶m->work, cryptomgr_probe, param); | |
106 | schedule_work(¶m->work); | |
107 | ||
108 | return NOTIFY_STOP; | |
109 | ||
110 | err_free_param: | |
111 | kfree(param); | |
112 | err: | |
113 | return NOTIFY_OK; | |
114 | } | |
115 | ||
116 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
117 | void *data) | |
118 | { | |
119 | switch (msg) { | |
120 | case CRYPTO_MSG_ALG_REQUEST: | |
121 | return cryptomgr_schedule_probe(data); | |
122 | } | |
123 | ||
124 | return NOTIFY_DONE; | |
125 | } | |
126 | ||
127 | static struct notifier_block cryptomgr_notifier = { | |
128 | .notifier_call = cryptomgr_notify, | |
129 | }; | |
130 | ||
131 | static int __init cryptomgr_init(void) | |
132 | { | |
133 | return crypto_register_notifier(&cryptomgr_notifier); | |
134 | } | |
135 | ||
136 | static void __exit cryptomgr_exit(void) | |
137 | { | |
138 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
139 | BUG_ON(err); | |
140 | } | |
141 | ||
142 | module_init(cryptomgr_init); | |
143 | module_exit(cryptomgr_exit); | |
144 | ||
145 | MODULE_LICENSE("GPL"); | |
146 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |