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 <crypto/internal/aead.h>
14#include <linux/completion.h>
15#include <linux/ctype.h>
16#include <linux/err.h>
17#include <linux/init.h>
18#include <linux/kthread.h>
19#include <linux/module.h>
20#include <linux/notifier.h>
21#include <linux/rtnetlink.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/string.h>
25
26#include "internal.h"
27
28struct cryptomgr_param {
29	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
30
31	struct {
32		struct rtattr attr;
33		struct crypto_attr_type data;
34	} type;
35
36	union {
37		struct rtattr attr;
38		struct {
39			struct rtattr attr;
40			struct crypto_attr_alg data;
41		} alg;
42		struct {
43			struct rtattr attr;
44			struct crypto_attr_u32 data;
45		} nu32;
46	} attrs[CRYPTO_MAX_ATTRS];
47
48	char template[CRYPTO_MAX_ALG_NAME];
49
50	struct crypto_larval *larval;
51
52	u32 otype;
53	u32 omask;
54};
55
56struct crypto_test_param {
57	char driver[CRYPTO_MAX_ALG_NAME];
58	char alg[CRYPTO_MAX_ALG_NAME];
59	u32 type;
60};
61
62static int cryptomgr_probe(void *data)
63{
64	struct cryptomgr_param *param = data;
65	struct crypto_template *tmpl;
66	struct crypto_instance *inst;
67	int err;
68
69	tmpl = crypto_lookup_template(param->template);
70	if (!tmpl)
71		goto out;
72
73	do {
74		if (tmpl->create) {
75			err = tmpl->create(tmpl, param->tb);
76			continue;
77		}
78
79		inst = tmpl->alloc(param->tb);
80		if (IS_ERR(inst))
81			err = PTR_ERR(inst);
82		else if ((err = crypto_register_instance(tmpl, inst)))
83			tmpl->free(inst);
84	} while (err == -EAGAIN && !signal_pending(current));
85
86	crypto_tmpl_put(tmpl);
87
88out:
89	complete_all(&param->larval->completion);
90	crypto_alg_put(&param->larval->alg);
91	kfree(param);
92	module_put_and_exit(0);
93}
94
95static int cryptomgr_schedule_probe(struct crypto_larval *larval)
96{
97	struct task_struct *thread;
98	struct cryptomgr_param *param;
99	const char *name = larval->alg.cra_name;
100	const char *p;
101	unsigned int len;
102	int i;
103
104	if (!try_module_get(THIS_MODULE))
105		goto err;
106
107	param = kzalloc(sizeof(*param), GFP_KERNEL);
108	if (!param)
109		goto err_put_module;
110
111	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
112		;
113
114	len = p - name;
115	if (!len || *p != '(')
116		goto err_free_param;
117
118	memcpy(param->template, name, len);
119
120	i = 0;
121	for (;;) {
122		int notnum = 0;
123
124		name = ++p;
125		len = 0;
126
127		for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
128			notnum |= !isdigit(*p);
129
130		if (*p == '(') {
131			int recursion = 0;
132
133			for (;;) {
134				if (!*++p)
135					goto err_free_param;
136				if (*p == '(')
137					recursion++;
138				else if (*p == ')' && !recursion--)
139					break;
140			}
141
142			notnum = 1;
143			p++;
144		}
145
146		len = p - name;
147		if (!len)
148			goto err_free_param;
149
150		if (notnum) {
151			param->attrs[i].alg.attr.rta_len =
152				sizeof(param->attrs[i].alg);
153			param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
154			memcpy(param->attrs[i].alg.data.name, name, len);
155		} else {
156			param->attrs[i].nu32.attr.rta_len =
157				sizeof(param->attrs[i].nu32);
158			param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
159			param->attrs[i].nu32.data.num =
160				simple_strtol(name, NULL, 0);
161		}
162
163		param->tb[i + 1] = &param->attrs[i].attr;
164		i++;
165
166		if (i >= CRYPTO_MAX_ATTRS)
167			goto err_free_param;
168
169		if (*p == ')')
170			break;
171
172		if (*p != ',')
173			goto err_free_param;
174	}
175
176	if (!i)
177		goto err_free_param;
178
179	param->tb[i + 1] = NULL;
180
181	param->type.attr.rta_len = sizeof(param->type);
182	param->type.attr.rta_type = CRYPTOA_TYPE;
183	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
184	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
185	param->tb[0] = &param->type.attr;
186
187	param->otype = larval->alg.cra_flags;
188	param->omask = larval->mask;
189
190	crypto_alg_get(&larval->alg);
191	param->larval = larval;
192
193	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
194	if (IS_ERR(thread))
195		goto err_put_larval;
196
197	wait_for_completion_interruptible(&larval->completion);
198
199	return NOTIFY_STOP;
200
201err_put_larval:
202	crypto_alg_put(&larval->alg);
203err_free_param:
204	kfree(param);
205err_put_module:
206	module_put(THIS_MODULE);
207err:
208	return NOTIFY_OK;
209}
210
211static int cryptomgr_test(void *data)
212{
213	struct crypto_test_param *param = data;
214	u32 type = param->type;
215	int err = 0;
216
217#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
218	goto skiptest;
219#endif
220
221	if (type & CRYPTO_ALG_TESTED)
222		goto skiptest;
223
224	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
225
226skiptest:
227	crypto_alg_tested(param->driver, err);
228
229	kfree(param);
230	module_put_and_exit(0);
231}
232
233static int cryptomgr_schedule_test(struct crypto_alg *alg)
234{
235	struct task_struct *thread;
236	struct crypto_test_param *param;
237	u32 type;
238
239	if (!try_module_get(THIS_MODULE))
240		goto err;
241
242	param = kzalloc(sizeof(*param), GFP_KERNEL);
243	if (!param)
244		goto err_put_module;
245
246	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
247	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
248	type = alg->cra_flags;
249
250	/* This piece of crap needs to disappear into per-type test hooks. */
251	if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
252	       CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
253	     ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
254	      CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
255					  alg->cra_ablkcipher.ivsize)) ||
256	    (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
257	     alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
258		type |= CRYPTO_ALG_TESTED;
259
260	param->type = type;
261
262	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
263	if (IS_ERR(thread))
264		goto err_free_param;
265
266	return NOTIFY_STOP;
267
268err_free_param:
269	kfree(param);
270err_put_module:
271	module_put(THIS_MODULE);
272err:
273	return NOTIFY_OK;
274}
275
276static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
277			    void *data)
278{
279	switch (msg) {
280	case CRYPTO_MSG_ALG_REQUEST:
281		return cryptomgr_schedule_probe(data);
282	case CRYPTO_MSG_ALG_REGISTER:
283		return cryptomgr_schedule_test(data);
284	}
285
286	return NOTIFY_DONE;
287}
288
289static struct notifier_block cryptomgr_notifier = {
290	.notifier_call = cryptomgr_notify,
291};
292
293static int __init cryptomgr_init(void)
294{
295	return crypto_register_notifier(&cryptomgr_notifier);
296}
297
298static void __exit cryptomgr_exit(void)
299{
300	int err = crypto_unregister_notifier(&cryptomgr_notifier);
301	BUG_ON(err);
302}
303
304subsys_initcall(cryptomgr_init);
305module_exit(cryptomgr_exit);
306
307MODULE_LICENSE("GPL");
308MODULE_DESCRIPTION("Crypto Algorithm Manager");
309