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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> | |
6bfd4809 | 20 | #include <linux/sched.h> |
2b8c19db HX |
21 | #include <linux/string.h> |
22 | #include <linux/workqueue.h> | |
23 | ||
24 | #include "internal.h" | |
25 | ||
26 | struct cryptomgr_param { | |
27 | struct work_struct work; | |
28 | ||
ebc610e5 HX |
29 | struct rtattr *tb[CRYPTOA_MAX]; |
30 | ||
31 | struct { | |
32 | struct rtattr attr; | |
33 | struct crypto_attr_type data; | |
34 | } type; | |
35 | ||
2b8c19db HX |
36 | struct { |
37 | struct rtattr attr; | |
38 | struct crypto_attr_alg data; | |
39 | } alg; | |
40 | ||
41 | struct { | |
42 | char name[CRYPTO_MAX_ALG_NAME]; | |
43 | } larval; | |
44 | ||
45 | char template[CRYPTO_MAX_ALG_NAME]; | |
46 | }; | |
47 | ||
65f27f38 | 48 | static void cryptomgr_probe(struct work_struct *work) |
2b8c19db | 49 | { |
65f27f38 DH |
50 | struct cryptomgr_param *param = |
51 | container_of(work, struct cryptomgr_param, work); | |
2b8c19db HX |
52 | struct crypto_template *tmpl; |
53 | struct crypto_instance *inst; | |
6bfd4809 | 54 | int err; |
2b8c19db HX |
55 | |
56 | tmpl = crypto_lookup_template(param->template); | |
57 | if (!tmpl) | |
58 | goto err; | |
59 | ||
6bfd4809 | 60 | do { |
ebc610e5 | 61 | inst = tmpl->alloc(param->tb); |
6bfd4809 HX |
62 | if (IS_ERR(inst)) |
63 | err = PTR_ERR(inst); | |
64 | else if ((err = crypto_register_instance(tmpl, inst))) | |
65 | tmpl->free(inst); | |
66 | } while (err == -EAGAIN && !signal_pending(current)); | |
2b8c19db HX |
67 | |
68 | crypto_tmpl_put(tmpl); | |
69 | ||
6bfd4809 HX |
70 | if (err) |
71 | goto err; | |
72 | ||
2b8c19db HX |
73 | out: |
74 | kfree(param); | |
75 | return; | |
76 | ||
77 | err: | |
ebc610e5 HX |
78 | crypto_larval_error(param->larval.name, param->type.data.type, |
79 | param->type.data.mask); | |
2b8c19db HX |
80 | goto out; |
81 | } | |
82 | ||
83 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) | |
84 | { | |
85 | struct cryptomgr_param *param; | |
86 | const char *name = larval->alg.cra_name; | |
87 | const char *p; | |
88 | unsigned int len; | |
89 | ||
ebc610e5 | 90 | param = kzalloc(sizeof(*param), GFP_KERNEL); |
2b8c19db HX |
91 | if (!param) |
92 | goto err; | |
93 | ||
94 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
95 | ; | |
96 | ||
97 | len = p - name; | |
98 | if (!len || *p != '(') | |
99 | goto err_free_param; | |
100 | ||
101 | memcpy(param->template, name, len); | |
2b8c19db HX |
102 | |
103 | name = p + 1; | |
104 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
105 | ; | |
106 | ||
107 | len = p - name; | |
108 | if (!len || *p != ')' || p[1]) | |
109 | goto err_free_param; | |
110 | ||
ebc610e5 HX |
111 | param->type.attr.rta_len = sizeof(param->type); |
112 | param->type.attr.rta_type = CRYPTOA_TYPE; | |
113 | param->type.data.type = larval->alg.cra_flags; | |
114 | param->type.data.mask = larval->mask; | |
115 | param->tb[CRYPTOA_TYPE - 1] = ¶m->type.attr; | |
116 | ||
2b8c19db HX |
117 | param->alg.attr.rta_len = sizeof(param->alg); |
118 | param->alg.attr.rta_type = CRYPTOA_ALG; | |
119 | memcpy(param->alg.data.name, name, len); | |
ebc610e5 | 120 | param->tb[CRYPTOA_ALG - 1] = ¶m->alg.attr; |
2b8c19db HX |
121 | |
122 | memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); | |
123 | ||
65f27f38 | 124 | INIT_WORK(¶m->work, cryptomgr_probe); |
2b8c19db HX |
125 | schedule_work(¶m->work); |
126 | ||
127 | return NOTIFY_STOP; | |
128 | ||
129 | err_free_param: | |
130 | kfree(param); | |
131 | err: | |
132 | return NOTIFY_OK; | |
133 | } | |
134 | ||
135 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
136 | void *data) | |
137 | { | |
138 | switch (msg) { | |
139 | case CRYPTO_MSG_ALG_REQUEST: | |
140 | return cryptomgr_schedule_probe(data); | |
141 | } | |
142 | ||
143 | return NOTIFY_DONE; | |
144 | } | |
145 | ||
146 | static struct notifier_block cryptomgr_notifier = { | |
147 | .notifier_call = cryptomgr_notify, | |
148 | }; | |
149 | ||
150 | static int __init cryptomgr_init(void) | |
151 | { | |
152 | return crypto_register_notifier(&cryptomgr_notifier); | |
153 | } | |
154 | ||
155 | static void __exit cryptomgr_exit(void) | |
156 | { | |
157 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
158 | BUG_ON(err); | |
159 | } | |
160 | ||
161 | module_init(cryptomgr_init); | |
162 | module_exit(cryptomgr_exit); | |
163 | ||
164 | MODULE_LICENSE("GPL"); | |
165 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |