[linux.git] / crypto / algboss.c

/*
 * Create default crypto algorithm instances.
 *
 * Copyright (c) 2006 Herbert Xu <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/internal/aead.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>

#include "internal.h"

struct cryptomgr_param {
	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];

	struct {
		struct rtattr attr;
		struct crypto_attr_type data;
	} type;

	union {
		struct rtattr attr;
		struct {
			struct rtattr attr;
			struct crypto_attr_alg data;
		} alg;
		struct {
			struct rtattr attr;
			struct crypto_attr_u32 data;
		} nu32;
	} attrs[CRYPTO_MAX_ATTRS];

	char larval[CRYPTO_MAX_ALG_NAME];
	char template[CRYPTO_MAX_ALG_NAME];

	u32 otype;
	u32 omask;
};

struct crypto_test_param {
	char driver[CRYPTO_MAX_ALG_NAME];
	char alg[CRYPTO_MAX_ALG_NAME];
	u32 type;
};

static int cryptomgr_probe(void *data)
{
	struct cryptomgr_param *param = data;
	struct crypto_template *tmpl;
	struct crypto_instance *inst;
	int err;

	tmpl = crypto_lookup_template(param->template);
	if (!tmpl)
		goto err;

	do {
		if (tmpl->create) {
			err = tmpl->create(tmpl, param->tb);
			continue;
		}

		inst = tmpl->alloc(param->tb);
		if (IS_ERR(inst))
			err = PTR_ERR(inst);
		else if ((err = crypto_register_instance(tmpl, inst)))
			tmpl->free(inst);
	} while (err == -EAGAIN && !signal_pending(current));

	crypto_tmpl_put(tmpl);

	if (err)
		goto err;

out:
	kfree(param);
	module_put_and_exit(0);

err:
	crypto_larval_error(param->larval, param->otype, param->omask);
	goto out;
}

static int cryptomgr_schedule_probe(struct crypto_larval *larval)
{
	struct task_struct *thread;
	struct cryptomgr_param *param;
	const char *name = larval->alg.cra_name;
	const char *p;
	unsigned int len;
	int i;

	if (!try_module_get(THIS_MODULE))
		goto err;

	param = kzalloc(sizeof(*param), GFP_KERNEL);
	if (!param)
		goto err_put_module;

	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
		;

	len = p - name;
	if (!len || *p != '(')
		goto err_free_param;

	memcpy(param->template, name, len);

	i = 0;
	for (;;) {
		int notnum = 0;

		name = ++p;
		len = 0;

		for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
			notnum |= !isdigit(*p);

		if (*p == '(') {
			int recursion = 0;

			for (;;) {
				if (!*++p)
					goto err_free_param;
				if (*p == '(')
					recursion++;
				else if (*p == ')' && !recursion--)
					break;
			}

			notnum = 1;
			p++;
		}

		len = p - name;
		if (!len)
			goto err_free_param;

		if (notnum) {
			param->attrs[i].alg.attr.rta_len =
				sizeof(param->attrs[i].alg);
			param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
			memcpy(param->attrs[i].alg.data.name, name, len);
		} else {
			param->attrs[i].nu32.attr.rta_len =
				sizeof(param->attrs[i].nu32);
			param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
			param->attrs[i].nu32.data.num =
				simple_strtol(name, NULL, 0);
		}

		param->tb[i + 1] = &param->attrs[i].attr;
		i++;

		if (i >= CRYPTO_MAX_ATTRS)
			goto err_free_param;

		if (*p == ')')
			break;

		if (*p != ',')
			goto err_free_param;
	}

	if (!i)
		goto err_free_param;

	param->tb[i + 1] = NULL;

	param->type.attr.rta_len = sizeof(param->type);
	param->type.attr.rta_type = CRYPTOA_TYPE;
	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
	param->tb[0] = &param->type.attr;

	param->otype = larval->alg.cra_flags;
	param->omask = larval->mask;

	memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);

	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
	if (IS_ERR(thread))
		goto err_free_param;

	return NOTIFY_STOP;

err_free_param:
	kfree(param);
err_put_module:
	module_put(THIS_MODULE);
err:
	return NOTIFY_OK;
}

static int cryptomgr_test(void *data)
{
	struct crypto_test_param *param = data;
	u32 type = param->type;
	int err = 0;

#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
	goto skiptest;
#endif

	if (type & CRYPTO_ALG_TESTED)
		goto skiptest;

	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);

skiptest:
	crypto_alg_tested(param->driver, err);

	kfree(param);
	module_put_and_exit(0);
}

static int cryptomgr_schedule_test(struct crypto_alg *alg)
{
	struct task_struct *thread;
	struct crypto_test_param *param;
	u32 type;

	if (!try_module_get(THIS_MODULE))
		goto err;

	param = kzalloc(sizeof(*param), GFP_KERNEL);
	if (!param)
		goto err_put_module;

	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
	type = alg->cra_flags;

	/* This piece of crap needs to disappear into per-type test hooks. */
	if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
	       CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
	     ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	      CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
					  alg->cra_ablkcipher.ivsize)) ||
	    (!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
	     alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
		type |= CRYPTO_ALG_TESTED;

	param->type = type;

	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
	if (IS_ERR(thread))
		goto err_free_param;

	return NOTIFY_STOP;

err_free_param:
	kfree(param);
err_put_module:
	module_put(THIS_MODULE);
err:
	return NOTIFY_OK;
}

static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
			    void *data)
{
	switch (msg) {
	case CRYPTO_MSG_ALG_REQUEST:
		return cryptomgr_schedule_probe(data);
	case CRYPTO_MSG_ALG_REGISTER:
		return cryptomgr_schedule_test(data);
	}

	return NOTIFY_DONE;
}

static struct notifier_block cryptomgr_notifier = {
	.notifier_call = cryptomgr_notify,
};

static int __init cryptomgr_init(void)
{
	return crypto_register_notifier(&cryptomgr_notifier);
}

static void __exit cryptomgr_exit(void)
{
	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	BUG_ON(err);
}

subsys_initcall(cryptomgr_init);
module_exit(cryptomgr_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crypto Algorithm Manager");
Commit	Line	Data
2b8c19db HX	1	/*
	2	* Create default crypto algorithm instances.
	3	*
	4	* Copyright (c) 2006 Herbert Xu <[email protected]>
	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
6fe4a28d	13	#include <crypto/internal/aead.h>
2b8c19db HX	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>
5a0e3ad6	22	#include <linux/slab.h>
2b8c19db	23	#include <linux/string.h>
2b8c19db HX	24
	25	#include "internal.h"
	26
	27	struct cryptomgr_param {
39e1ee01	28	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
ebc610e5 HX	29
	30	struct {
	31	struct rtattr attr;
	32	struct crypto_attr_type data;
	33	} type;
	34
39e1ee01	35	union {
2b8c19db	36	struct rtattr attr;
39e1ee01 HX	37	struct {
	38	struct rtattr attr;
	39	struct crypto_attr_alg data;
	40	} alg;
	41	struct {
	42	struct rtattr attr;
	43	struct crypto_attr_u32 data;
	44	} nu32;
	45	} attrs[CRYPTO_MAX_ATTRS];
	46
	47	char larval[CRYPTO_MAX_ALG_NAME];
2b8c19db	48	char template[CRYPTO_MAX_ALG_NAME];
73d3864a HX	49
	50	u32 otype;
	51	u32 omask;
	52	};
	53
	54	struct crypto_test_param {
	55	char driver[CRYPTO_MAX_ALG_NAME];
	56	char alg[CRYPTO_MAX_ALG_NAME];
	57	u32 type;
2b8c19db HX	58	};
2b8c19db HX	59
cf02f5da	60	static int cryptomgr_probe(void *data)
2b8c19db	61	{
cf02f5da	62	struct cryptomgr_param *param = data;
2b8c19db HX	63	struct crypto_template *tmpl;
2b8c19db HX	64	struct crypto_instance *inst;
6bfd4809	65	int err;
2b8c19db HX	66
	67	tmpl = crypto_lookup_template(param->template);
	68	if (!tmpl)
	69	goto err;
	70
6bfd4809	71	do {
f2ac72e8 HX	72	if (tmpl->create) {
	73	err = tmpl->create(tmpl, param->tb);
	74	continue;
	75	}
	76
ebc610e5	77	inst = tmpl->alloc(param->tb);
6bfd4809 HX	78	if (IS_ERR(inst))
	79	err = PTR_ERR(inst);
	80	else if ((err = crypto_register_instance(tmpl, inst)))
	81	tmpl->free(inst);
	82	} while (err == -EAGAIN && !signal_pending(current));
2b8c19db HX	83
	84	crypto_tmpl_put(tmpl);
	85
6bfd4809 HX	86	if (err)
	87	goto err;
	88
2b8c19db HX	89	out:
2b8c19db HX	90	kfree(param);
cf02f5da	91	module_put_and_exit(0);
2b8c19db HX	92
2b8c19db HX	93	err:
73d3864a	94	crypto_larval_error(param->larval, param->otype, param->omask);
2b8c19db HX	95	goto out;
	96	}
	97
	98	static int cryptomgr_schedule_probe(struct crypto_larval *larval)
	99	{
1605b847	100	struct task_struct *thread;
2b8c19db HX	101	struct cryptomgr_param *param;
	102	const char *name = larval->alg.cra_name;
	103	const char *p;
	104	unsigned int len;
39e1ee01	105	int i;
2b8c19db	106
cf02f5da HX	107	if (!try_module_get(THIS_MODULE))
	108	goto err;
	109
ebc610e5	110	param = kzalloc(sizeof(*param), GFP_KERNEL);
2b8c19db	111	if (!param)
cf02f5da	112	goto err_put_module;
2b8c19db HX	113
	114	for (p = name; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	115	;
	116
	117	len = p - name;
	118	if (!len \|\| *p != '(')
	119	goto err_free_param;
	120
	121	memcpy(param->template, name, len);
2b8c19db	122
39e1ee01 HX	123	i = 0;
	124	for (;;) {
	125	int notnum = 0;
2b8c19db	126
39e1ee01 HX	127	name = ++p;
	128	len = 0;
	129
	130	for (; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	131	notnum \|= !isdigit(*p);
	132
	133	if (*p == '(') {
	134	int recursion = 0;
	135
	136	for (;;) {
	137	if (!*++p)
	138	goto err_free_param;
	139	if (*p == '(')
	140	recursion++;
	141	else if (*p == ')' && !recursion--)
	142	break;
	143	}
	144
	145	notnum = 1;
720a650f	146	p++;
39e1ee01	147	}
cf02f5da HX	148
cf02f5da HX	149	len = p - name;
39e1ee01 HX	150	if (!len)
	151	goto err_free_param;
	152
	153	if (notnum) {
	154	param->attrs[i].alg.attr.rta_len =
	155	sizeof(param->attrs[i].alg);
	156	param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
	157	memcpy(param->attrs[i].alg.data.name, name, len);
	158	} else {
	159	param->attrs[i].nu32.attr.rta_len =
	160	sizeof(param->attrs[i].nu32);
	161	param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
	162	param->attrs[i].nu32.data.num =
	163	simple_strtol(name, NULL, 0);
	164	}
	165
	166	param->tb[i + 1] = &param->attrs[i].attr;
	167	i++;
	168
720a650f	169	if (i >= CRYPTO_MAX_ATTRS)
39e1ee01 HX	170	goto err_free_param;
	171
	172	if (*p == ')')
	173	break;
	174
	175	if (*p != ',')
	176	goto err_free_param;
cf02f5da HX	177	}
cf02f5da HX	178
39e1ee01	179	if (!i)
2b8c19db HX	180	goto err_free_param;
2b8c19db HX	181
39e1ee01 HX	182	param->tb[i + 1] = NULL;
39e1ee01 HX	183
ebc610e5 HX	184	param->type.attr.rta_len = sizeof(param->type);
ebc610e5 HX	185	param->type.attr.rta_type = CRYPTOA_TYPE;
73d3864a HX	186	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
73d3864a HX	187	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
39e1ee01	188	param->tb[0] = &param->type.attr;
2b8c19db	189
73d3864a HX	190	param->otype = larval->alg.cra_flags;
	191	param->omask = larval->mask;
	192
39e1ee01	193	memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
2b8c19db	194
73d3864a HX	195	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
	196	if (IS_ERR(thread))
	197	goto err_free_param;
	198
	199	return NOTIFY_STOP;
	200
	201	err_free_param:
	202	kfree(param);
	203	err_put_module:
	204	module_put(THIS_MODULE);
	205	err:
	206	return NOTIFY_OK;
	207	}
	208
	209	static int cryptomgr_test(void *data)
	210	{
	211	struct crypto_test_param *param = data;
	212	u32 type = param->type;
	213	int err = 0;
	214
326a6346 HX	215	#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
	216	goto skiptest;
	217	#endif
	218
6fe4a28d	219	if (type & CRYPTO_ALG_TESTED)
73d3864a HX	220	goto skiptest;
73d3864a HX	221
1aa4ecd9	222	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
73d3864a HX	223
	224	skiptest:
	225	crypto_alg_tested(param->driver, err);
	226
	227	kfree(param);
	228	module_put_and_exit(0);
	229	}
	230
	231	static int cryptomgr_schedule_test(struct crypto_alg *alg)
	232	{
	233	struct task_struct *thread;
	234	struct crypto_test_param *param;
6fe4a28d	235	u32 type;
73d3864a HX	236
	237	if (!try_module_get(THIS_MODULE))
	238	goto err;
	239
	240	param = kzalloc(sizeof(*param), GFP_KERNEL);
	241	if (!param)
	242	goto err_put_module;
	243
	244	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
	245	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
6fe4a28d HX	246	type = alg->cra_flags;
	247
	248	/* This piece of crap needs to disappear into per-type test hooks. */
	249	if ((!((type ^ CRYPTO_ALG_TYPE_BLKCIPHER) &
	250	CRYPTO_ALG_TYPE_BLKCIPHER_MASK) && !(type & CRYPTO_ALG_GENIV) &&
	251	((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	252	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
	253	alg->cra_ablkcipher.ivsize)) \|\|
	254	(!((type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) &&
	255	alg->cra_type == &crypto_nivaead_type && alg->cra_aead.ivsize))
	256	type \|= CRYPTO_ALG_TESTED;
	257
	258	param->type = type;
73d3864a HX	259
73d3864a HX	260	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
1605b847	261	if (IS_ERR(thread))
cf02f5da	262	goto err_free_param;
2b8c19db HX	263
	264	return NOTIFY_STOP;
	265
	266	err_free_param:
	267	kfree(param);
cf02f5da HX	268	err_put_module:
cf02f5da HX	269	module_put(THIS_MODULE);
2b8c19db HX	270	err:
	271	return NOTIFY_OK;
	272	}
	273
	274	static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
	275	void *data)
	276	{
	277	switch (msg) {
	278	case CRYPTO_MSG_ALG_REQUEST:
	279	return cryptomgr_schedule_probe(data);
73d3864a HX	280	case CRYPTO_MSG_ALG_REGISTER:
73d3864a HX	281	return cryptomgr_schedule_test(data);
2b8c19db HX	282	}
	283
	284	return NOTIFY_DONE;
	285	}
	286
	287	static struct notifier_block cryptomgr_notifier = {
	288	.notifier_call = cryptomgr_notify,
	289	};
	290
	291	static int __init cryptomgr_init(void)
	292	{
f8b0d4d0	293	return crypto_register_notifier(&cryptomgr_notifier);
2b8c19db HX	294	}
	295
	296	static void __exit cryptomgr_exit(void)
	297	{
	298	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	299	BUG_ON(err);
	300	}
	301
da7f033d	302	subsys_initcall(cryptomgr_init);
2b8c19db HX	303	module_exit(cryptomgr_exit);
	304
	305	MODULE_LICENSE("GPL");
	306	MODULE_DESCRIPTION("Crypto Algorithm Manager");