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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 | ||
29 | struct { | |
30 | struct rtattr attr; | |
31 | struct crypto_attr_alg data; | |
32 | } alg; | |
33 | ||
34 | struct { | |
492e2b63 HX |
35 | u32 type; |
36 | u32 mask; | |
2b8c19db HX |
37 | char name[CRYPTO_MAX_ALG_NAME]; |
38 | } larval; | |
39 | ||
40 | char template[CRYPTO_MAX_ALG_NAME]; | |
41 | }; | |
42 | ||
43 | static void cryptomgr_probe(void *data) | |
44 | { | |
45 | struct cryptomgr_param *param = data; | |
46 | struct crypto_template *tmpl; | |
47 | struct crypto_instance *inst; | |
6bfd4809 | 48 | int err; |
2b8c19db HX |
49 | |
50 | tmpl = crypto_lookup_template(param->template); | |
51 | if (!tmpl) | |
52 | goto err; | |
53 | ||
6bfd4809 HX |
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)); | |
2b8c19db HX |
61 | |
62 | crypto_tmpl_put(tmpl); | |
63 | ||
6bfd4809 HX |
64 | if (err) |
65 | goto err; | |
66 | ||
2b8c19db HX |
67 | out: |
68 | kfree(param); | |
69 | return; | |
70 | ||
71 | err: | |
492e2b63 HX |
72 | crypto_larval_error(param->larval.name, param->larval.type, |
73 | param->larval.mask); | |
2b8c19db HX |
74 | goto out; |
75 | } | |
76 | ||
77 | static 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); | |
492e2b63 HX |
112 | param->larval.type = larval->alg.cra_flags; |
113 | param->larval.mask = larval->mask; | |
2b8c19db HX |
114 | |
115 | INIT_WORK(¶m->work, cryptomgr_probe, param); | |
116 | schedule_work(¶m->work); | |
117 | ||
118 | return NOTIFY_STOP; | |
119 | ||
120 | err_free_param: | |
121 | kfree(param); | |
122 | err: | |
123 | return NOTIFY_OK; | |
124 | } | |
125 | ||
126 | static 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 | ||
137 | static struct notifier_block cryptomgr_notifier = { | |
138 | .notifier_call = cryptomgr_notify, | |
139 | }; | |
140 | ||
141 | static int __init cryptomgr_init(void) | |
142 | { | |
143 | return crypto_register_notifier(&cryptomgr_notifier); | |
144 | } | |
145 | ||
146 | static void __exit cryptomgr_exit(void) | |
147 | { | |
148 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
149 | BUG_ON(err); | |
150 | } | |
151 | ||
152 | module_init(cryptomgr_init); | |
153 | module_exit(cryptomgr_exit); | |
154 | ||
155 | MODULE_LICENSE("GPL"); | |
156 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |