[linux-2.6-block.git] / crypto / cryptomgr.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 <linux/crypto.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <linux/string.h>
#include <linux/workqueue.h>

#include "internal.h"

struct cryptomgr_param {
	struct work_struct work;

	struct {
		struct rtattr attr;
		struct crypto_attr_alg data;
	} alg;

	struct {
		u32 type;
		u32 mask;
		char name[CRYPTO_MAX_ALG_NAME];
	} larval;

	char template[CRYPTO_MAX_ALG_NAME];
};

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

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

	inst = tmpl->alloc(&param->alg, sizeof(param->alg));
	if (IS_ERR(inst))
		goto err;
	else if ((err = crypto_register_instance(tmpl, inst))) {
		tmpl->free(inst);
		goto err;
	}

	crypto_tmpl_put(tmpl);

out:
	kfree(param);
	return;

err:
	crypto_larval_error(param->larval.name, param->larval.type,
			    param->larval.mask);
	goto out;
}

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

	param = kmalloc(sizeof(*param), GFP_KERNEL);
	if (!param)
		goto err;

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

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

	memcpy(param->template, name, len);
	param->template[len] = 0;

	name = p + 1;
	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
		;

	len = p - name;
	if (!len || *p != ')' || p[1])
		goto err_free_param;

	param->alg.attr.rta_len = sizeof(param->alg);
	param->alg.attr.rta_type = CRYPTOA_ALG;
	memcpy(param->alg.data.name, name, len);
	param->alg.data.name[len] = 0;

	memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
	param->larval.type = larval->alg.cra_flags;
	param->larval.mask = larval->mask;

	INIT_WORK(&param->work, cryptomgr_probe, param);
	schedule_work(&param->work);

	return NOTIFY_STOP;

err_free_param:
	kfree(param);
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);
	}

	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);
}

module_init(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
	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/string.h>
	21	#include <linux/workqueue.h>
	22
	23	#include "internal.h"
	24
	25	struct cryptomgr_param {
	26	struct work_struct work;
	27
	28	struct {
	29	struct rtattr attr;
	30	struct crypto_attr_alg data;
	31	} alg;
	32
	33	struct {
492e2b63 HX	34	u32 type;
492e2b63 HX	35	u32 mask;
2b8c19db HX	36	char name[CRYPTO_MAX_ALG_NAME];
	37	} larval;
	38
	39	char template[CRYPTO_MAX_ALG_NAME];
	40	};
	41
	42	static void cryptomgr_probe(void *data)
	43	{
	44	struct cryptomgr_param *param = data;
	45	struct crypto_template *tmpl;
	46	struct crypto_instance *inst;
	47
	48	tmpl = crypto_lookup_template(param->template);
	49	if (!tmpl)
	50	goto err;
	51
	52	inst = tmpl->alloc(&param->alg, sizeof(param->alg));
	53	if (IS_ERR(inst))
	54	goto err;
	55	else if ((err = crypto_register_instance(tmpl, inst))) {
	56	tmpl->free(inst);
	57	goto err;
	58	}
	59
	60	crypto_tmpl_put(tmpl);
	61
	62	out:
	63	kfree(param);
	64	return;
	65
	66	err:
492e2b63 HX	67	crypto_larval_error(param->larval.name, param->larval.type,
492e2b63 HX	68	param->larval.mask);
2b8c19db HX	69	goto out;
	70	}
	71
	72	static int cryptomgr_schedule_probe(struct crypto_larval *larval)
	73	{
	74	struct cryptomgr_param *param;
	75	const char *name = larval->alg.cra_name;
	76	const char *p;
	77	unsigned int len;
	78
	79	param = kmalloc(sizeof(*param), GFP_KERNEL);
	80	if (!param)
	81	goto err;
	82
	83	for (p = name; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	84	;
	85
	86	len = p - name;
	87	if (!len \|\| *p != '(')
	88	goto err_free_param;
	89
	90	memcpy(param->template, name, len);
	91	param->template[len] = 0;
	92
	93	name = p + 1;
	94	for (p = name; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	95	;
	96
	97	len = p - name;
	98	if (!len \|\| *p != ')' \|\| p[1])
	99	goto err_free_param;
	100
	101	param->alg.attr.rta_len = sizeof(param->alg);
	102	param->alg.attr.rta_type = CRYPTOA_ALG;
	103	memcpy(param->alg.data.name, name, len);
	104	param->alg.data.name[len] = 0;
	105
	106	memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
492e2b63 HX	107	param->larval.type = larval->alg.cra_flags;
492e2b63 HX	108	param->larval.mask = larval->mask;
2b8c19db HX	109
	110	INIT_WORK(&param->work, cryptomgr_probe, param);
	111	schedule_work(&param->work);
	112
	113	return NOTIFY_STOP;
	114
	115	err_free_param:
	116	kfree(param);
	117	err:
	118	return NOTIFY_OK;
	119	}
	120
	121	static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
	122	void *data)
	123	{
	124	switch (msg) {
	125	case CRYPTO_MSG_ALG_REQUEST:
	126	return cryptomgr_schedule_probe(data);
	127	}
	128
	129	return NOTIFY_DONE;
	130	}
	131
	132	static struct notifier_block cryptomgr_notifier = {
	133	.notifier_call = cryptomgr_notify,
	134	};
	135
	136	static int __init cryptomgr_init(void)
	137	{
	138	return crypto_register_notifier(&cryptomgr_notifier);
	139	}
	140
	141	static void __exit cryptomgr_exit(void)
	142	{
	143	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	144	BUG_ON(err);
	145	}
	146
	147	module_init(cryptomgr_init);
	148	module_exit(cryptomgr_exit);
	149
	150	MODULE_LICENSE("GPL");
	151	MODULE_DESCRIPTION("Crypto Algorithm Manager");