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Commit | Line | Data |
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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> | |
cf02f5da | 17 | #include <linux/kthread.h> |
2b8c19db HX |
18 | #include <linux/module.h> |
19 | #include <linux/notifier.h> | |
20 | #include <linux/rtnetlink.h> | |
6bfd4809 | 21 | #include <linux/sched.h> |
2b8c19db | 22 | #include <linux/string.h> |
2b8c19db HX |
23 | |
24 | #include "internal.h" | |
25 | ||
26 | struct cryptomgr_param { | |
cf02f5da | 27 | struct task_struct *thread; |
2b8c19db | 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 | ||
cf02f5da | 48 | static int cryptomgr_probe(void *data) |
2b8c19db | 49 | { |
cf02f5da | 50 | struct cryptomgr_param *param = data; |
2b8c19db HX |
51 | struct crypto_template *tmpl; |
52 | struct crypto_instance *inst; | |
6bfd4809 | 53 | int err; |
2b8c19db HX |
54 | |
55 | tmpl = crypto_lookup_template(param->template); | |
56 | if (!tmpl) | |
57 | goto err; | |
58 | ||
6bfd4809 | 59 | do { |
ebc610e5 | 60 | inst = tmpl->alloc(param->tb); |
6bfd4809 HX |
61 | if (IS_ERR(inst)) |
62 | err = PTR_ERR(inst); | |
63 | else if ((err = crypto_register_instance(tmpl, inst))) | |
64 | tmpl->free(inst); | |
65 | } while (err == -EAGAIN && !signal_pending(current)); | |
2b8c19db HX |
66 | |
67 | crypto_tmpl_put(tmpl); | |
68 | ||
6bfd4809 HX |
69 | if (err) |
70 | goto err; | |
71 | ||
2b8c19db HX |
72 | out: |
73 | kfree(param); | |
cf02f5da | 74 | module_put_and_exit(0); |
2b8c19db HX |
75 | |
76 | err: | |
ebc610e5 HX |
77 | crypto_larval_error(param->larval.name, param->type.data.type, |
78 | param->type.data.mask); | |
2b8c19db HX |
79 | goto out; |
80 | } | |
81 | ||
82 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) | |
83 | { | |
84 | struct cryptomgr_param *param; | |
85 | const char *name = larval->alg.cra_name; | |
86 | const char *p; | |
87 | unsigned int len; | |
88 | ||
cf02f5da HX |
89 | if (!try_module_get(THIS_MODULE)) |
90 | goto err; | |
91 | ||
ebc610e5 | 92 | param = kzalloc(sizeof(*param), GFP_KERNEL); |
2b8c19db | 93 | if (!param) |
cf02f5da | 94 | goto err_put_module; |
2b8c19db HX |
95 | |
96 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
97 | ; | |
98 | ||
99 | len = p - name; | |
100 | if (!len || *p != '(') | |
101 | goto err_free_param; | |
102 | ||
103 | memcpy(param->template, name, len); | |
2b8c19db HX |
104 | |
105 | name = p + 1; | |
cf02f5da HX |
106 | len = 0; |
107 | for (p = name; *p; p++) { | |
108 | for (; isalnum(*p) || *p == '-' || *p == '_' || *p == '('; p++) | |
109 | ; | |
2b8c19db | 110 | |
cf02f5da HX |
111 | if (*p != ')') |
112 | goto err_free_param; | |
113 | ||
114 | len = p - name; | |
115 | } | |
116 | ||
117 | if (!len || name[len + 1]) | |
2b8c19db HX |
118 | goto err_free_param; |
119 | ||
ebc610e5 HX |
120 | param->type.attr.rta_len = sizeof(param->type); |
121 | param->type.attr.rta_type = CRYPTOA_TYPE; | |
122 | param->type.data.type = larval->alg.cra_flags; | |
123 | param->type.data.mask = larval->mask; | |
124 | param->tb[CRYPTOA_TYPE - 1] = ¶m->type.attr; | |
125 | ||
2b8c19db HX |
126 | param->alg.attr.rta_len = sizeof(param->alg); |
127 | param->alg.attr.rta_type = CRYPTOA_ALG; | |
128 | memcpy(param->alg.data.name, name, len); | |
ebc610e5 | 129 | param->tb[CRYPTOA_ALG - 1] = ¶m->alg.attr; |
2b8c19db HX |
130 | |
131 | memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); | |
132 | ||
cf02f5da HX |
133 | param->thread = kthread_run(cryptomgr_probe, param, "cryptomgr"); |
134 | if (IS_ERR(param->thread)) | |
135 | goto err_free_param; | |
2b8c19db HX |
136 | |
137 | return NOTIFY_STOP; | |
138 | ||
139 | err_free_param: | |
140 | kfree(param); | |
cf02f5da HX |
141 | err_put_module: |
142 | module_put(THIS_MODULE); | |
2b8c19db HX |
143 | err: |
144 | return NOTIFY_OK; | |
145 | } | |
146 | ||
147 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
148 | void *data) | |
149 | { | |
150 | switch (msg) { | |
151 | case CRYPTO_MSG_ALG_REQUEST: | |
152 | return cryptomgr_schedule_probe(data); | |
153 | } | |
154 | ||
155 | return NOTIFY_DONE; | |
156 | } | |
157 | ||
158 | static struct notifier_block cryptomgr_notifier = { | |
159 | .notifier_call = cryptomgr_notify, | |
160 | }; | |
161 | ||
162 | static int __init cryptomgr_init(void) | |
163 | { | |
164 | return crypto_register_notifier(&cryptomgr_notifier); | |
165 | } | |
166 | ||
167 | static void __exit cryptomgr_exit(void) | |
168 | { | |
169 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
170 | BUG_ON(err); | |
171 | } | |
172 | ||
173 | module_init(cryptomgr_init); | |
174 | module_exit(cryptomgr_exit); | |
175 | ||
176 | MODULE_LICENSE("GPL"); | |
177 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |