Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/sched.h>
21#include <linux/string.h>
22#include <linux/workqueue.h>
23
24#include "internal.h"
25
26struct 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 {
35 u32 type;
36 u32 mask;
37 char name[CRYPTO_MAX_ALG_NAME];
38 } larval;
39
40 char template[CRYPTO_MAX_ALG_NAME];
41};
42
43static void cryptomgr_probe(struct work_struct *work)
44{
45 struct cryptomgr_param *param =
46 container_of(work, struct cryptomgr_param, work);
47 struct crypto_template *tmpl;
48 struct crypto_instance *inst;
49 int err;
50
51 tmpl = crypto_lookup_template(param->template);
52 if (!tmpl)
53 goto err;
54
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));
62
63 crypto_tmpl_put(tmpl);
64
65 if (err)
66 goto err;
67
68out:
69 kfree(param);
70 return;
71
72err:
73 crypto_larval_error(param->larval.name, param->larval.type,
74 param->larval.mask);
75 goto out;
76}
77
78static 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);
113 param->larval.type = larval->alg.cra_flags;
114 param->larval.mask = larval->mask;
115
116 INIT_WORK(¶m->work, cryptomgr_probe);
117 schedule_work(¶m->work);
118
119 return NOTIFY_STOP;
120
121err_free_param:
122 kfree(param);
123err:
124 return NOTIFY_OK;
125}
126
127static 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
138static struct notifier_block cryptomgr_notifier = {
139 .notifier_call = cryptomgr_notify,
140};
141
142static int __init cryptomgr_init(void)
143{
144 return crypto_register_notifier(&cryptomgr_notifier);
145}
146
147static void __exit cryptomgr_exit(void)
148{
149 int err = crypto_unregister_notifier(&cryptomgr_notifier);
150 BUG_ON(err);
151}
152
153module_init(cryptomgr_init);
154module_exit(cryptomgr_exit);
155
156MODULE_LICENSE("GPL");
157MODULE_DESCRIPTION("Crypto Algorithm Manager");