Commit | Line | Data |
---|---|---|
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 { | |
492e2b63 HX |
34 | u32 type; |
35 | u32 mask; | |
2b8c19db HX |
36 | char name[CRYPTO_MAX_ALG_NAME]; |
37 | } larval; | |
38 | ||
39 | char template[CRYPTO_MAX_ALG_NAME]; | |
40 | }; | |
41 | ||
42 | static void cryptomgr_probe(void *data) | |
43 | { | |
44 | struct cryptomgr_param *param = data; | |
45 | struct crypto_template *tmpl; | |
46 | struct crypto_instance *inst; | |
47 | ||
48 | tmpl = crypto_lookup_template(param->template); | |
49 | if (!tmpl) | |
50 | goto err; | |
51 | ||
52 | inst = tmpl->alloc(¶m->alg, sizeof(param->alg)); | |
53 | if (IS_ERR(inst)) | |
54 | goto err; | |
55 | else if ((err = crypto_register_instance(tmpl, inst))) { | |
56 | tmpl->free(inst); | |
57 | goto err; | |
58 | } | |
59 | ||
60 | crypto_tmpl_put(tmpl); | |
61 | ||
62 | out: | |
63 | kfree(param); | |
64 | return; | |
65 | ||
66 | err: | |
492e2b63 HX |
67 | crypto_larval_error(param->larval.name, param->larval.type, |
68 | param->larval.mask); | |
2b8c19db HX |
69 | goto out; |
70 | } | |
71 | ||
72 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) | |
73 | { | |
74 | struct cryptomgr_param *param; | |
75 | const char *name = larval->alg.cra_name; | |
76 | const char *p; | |
77 | unsigned int len; | |
78 | ||
79 | param = kmalloc(sizeof(*param), GFP_KERNEL); | |
80 | if (!param) | |
81 | goto err; | |
82 | ||
83 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
84 | ; | |
85 | ||
86 | len = p - name; | |
87 | if (!len || *p != '(') | |
88 | goto err_free_param; | |
89 | ||
90 | memcpy(param->template, name, len); | |
91 | param->template[len] = 0; | |
92 | ||
93 | name = p + 1; | |
94 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
95 | ; | |
96 | ||
97 | len = p - name; | |
98 | if (!len || *p != ')' || p[1]) | |
99 | goto err_free_param; | |
100 | ||
101 | param->alg.attr.rta_len = sizeof(param->alg); | |
102 | param->alg.attr.rta_type = CRYPTOA_ALG; | |
103 | memcpy(param->alg.data.name, name, len); | |
104 | param->alg.data.name[len] = 0; | |
105 | ||
106 | memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); | |
492e2b63 HX |
107 | param->larval.type = larval->alg.cra_flags; |
108 | param->larval.mask = larval->mask; | |
2b8c19db HX |
109 | |
110 | INIT_WORK(¶m->work, cryptomgr_probe, param); | |
111 | schedule_work(¶m->work); | |
112 | ||
113 | return NOTIFY_STOP; | |
114 | ||
115 | err_free_param: | |
116 | kfree(param); | |
117 | err: | |
118 | return NOTIFY_OK; | |
119 | } | |
120 | ||
121 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
122 | void *data) | |
123 | { | |
124 | switch (msg) { | |
125 | case CRYPTO_MSG_ALG_REQUEST: | |
126 | return cryptomgr_schedule_probe(data); | |
127 | } | |
128 | ||
129 | return NOTIFY_DONE; | |
130 | } | |
131 | ||
132 | static struct notifier_block cryptomgr_notifier = { | |
133 | .notifier_call = cryptomgr_notify, | |
134 | }; | |
135 | ||
136 | static int __init cryptomgr_init(void) | |
137 | { | |
138 | return crypto_register_notifier(&cryptomgr_notifier); | |
139 | } | |
140 | ||
141 | static void __exit cryptomgr_exit(void) | |
142 | { | |
143 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
144 | BUG_ON(err); | |
145 | } | |
146 | ||
147 | module_init(cryptomgr_init); | |
148 | module_exit(cryptomgr_exit); | |
149 | ||
150 | MODULE_LICENSE("GPL"); | |
151 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |