[linux-2.6-block.git] / crypto / algboss.c

/*
 * Create default crypto algorithm instances.
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * 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/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;

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