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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 | ||
65f27f38 | 43 | static void cryptomgr_probe(struct work_struct *work) |
2b8c19db | 44 | { |
65f27f38 DH |
45 | struct cryptomgr_param *param = |
46 | container_of(work, struct cryptomgr_param, work); | |
2b8c19db HX |
47 | struct crypto_template *tmpl; |
48 | struct crypto_instance *inst; | |
6bfd4809 | 49 | int err; |
2b8c19db HX |
50 | |
51 | tmpl = crypto_lookup_template(param->template); | |
52 | if (!tmpl) | |
53 | goto err; | |
54 | ||
6bfd4809 HX |
55 | do { |
56 | inst = tmpl->alloc(¶m->alg, sizeof(param->alg)); | |
57 | if (IS_ERR(inst)) | |
58 | err = PTR_ERR(inst); | |
59 | else if ((err = crypto_register_instance(tmpl, inst))) | |
60 | tmpl->free(inst); | |
61 | } while (err == -EAGAIN && !signal_pending(current)); | |
2b8c19db HX |
62 | |
63 | crypto_tmpl_put(tmpl); | |
64 | ||
6bfd4809 HX |
65 | if (err) |
66 | goto err; | |
67 | ||
2b8c19db HX |
68 | out: |
69 | kfree(param); | |
70 | return; | |
71 | ||
72 | err: | |
492e2b63 HX |
73 | crypto_larval_error(param->larval.name, param->larval.type, |
74 | param->larval.mask); | |
2b8c19db HX |
75 | goto out; |
76 | } | |
77 | ||
78 | static int cryptomgr_schedule_probe(struct crypto_larval *larval) | |
79 | { | |
80 | struct cryptomgr_param *param; | |
81 | const char *name = larval->alg.cra_name; | |
82 | const char *p; | |
83 | unsigned int len; | |
84 | ||
85 | param = kmalloc(sizeof(*param), GFP_KERNEL); | |
86 | if (!param) | |
87 | goto err; | |
88 | ||
89 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
90 | ; | |
91 | ||
92 | len = p - name; | |
93 | if (!len || *p != '(') | |
94 | goto err_free_param; | |
95 | ||
96 | memcpy(param->template, name, len); | |
97 | param->template[len] = 0; | |
98 | ||
99 | name = p + 1; | |
100 | for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) | |
101 | ; | |
102 | ||
103 | len = p - name; | |
104 | if (!len || *p != ')' || p[1]) | |
105 | goto err_free_param; | |
106 | ||
107 | param->alg.attr.rta_len = sizeof(param->alg); | |
108 | param->alg.attr.rta_type = CRYPTOA_ALG; | |
109 | memcpy(param->alg.data.name, name, len); | |
110 | param->alg.data.name[len] = 0; | |
111 | ||
112 | memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME); | |
492e2b63 HX |
113 | param->larval.type = larval->alg.cra_flags; |
114 | param->larval.mask = larval->mask; | |
2b8c19db | 115 | |
65f27f38 | 116 | INIT_WORK(¶m->work, cryptomgr_probe); |
2b8c19db HX |
117 | schedule_work(¶m->work); |
118 | ||
119 | return NOTIFY_STOP; | |
120 | ||
121 | err_free_param: | |
122 | kfree(param); | |
123 | err: | |
124 | return NOTIFY_OK; | |
125 | } | |
126 | ||
127 | static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, | |
128 | void *data) | |
129 | { | |
130 | switch (msg) { | |
131 | case CRYPTO_MSG_ALG_REQUEST: | |
132 | return cryptomgr_schedule_probe(data); | |
133 | } | |
134 | ||
135 | return NOTIFY_DONE; | |
136 | } | |
137 | ||
138 | static struct notifier_block cryptomgr_notifier = { | |
139 | .notifier_call = cryptomgr_notify, | |
140 | }; | |
141 | ||
142 | static int __init cryptomgr_init(void) | |
143 | { | |
144 | return crypto_register_notifier(&cryptomgr_notifier); | |
145 | } | |
146 | ||
147 | static void __exit cryptomgr_exit(void) | |
148 | { | |
149 | int err = crypto_unregister_notifier(&cryptomgr_notifier); | |
150 | BUG_ON(err); | |
151 | } | |
152 | ||
153 | module_init(cryptomgr_init); | |
154 | module_exit(cryptomgr_exit); | |
155 | ||
156 | MODULE_LICENSE("GPL"); | |
157 | MODULE_DESCRIPTION("Crypto Algorithm Manager"); |