[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/sched.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(struct work_struct *work)
{
	struct cryptomgr_param *param =
		container_of(work, struct cryptomgr_param, work);
	struct crypto_template *tmpl;
	struct crypto_instance *inst;
	int err;

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

	do {
		inst = tmpl->alloc(&param->alg, sizeof(param->alg));
		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);
	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);
	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>
6bfd4809	20	#include <linux/sched.h>
2b8c19db HX	21	#include <linux/string.h>
	22	#include <linux/workqueue.h>
	23
	24	#include "internal.h"
	25
	26	struct 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 {
492e2b63 HX	35	u32 type;
492e2b63 HX	36	u32 mask;
2b8c19db HX	37	char name[CRYPTO_MAX_ALG_NAME];
	38	} larval;
	39
	40	char template[CRYPTO_MAX_ALG_NAME];
	41	};
	42
65f27f38	43	static void cryptomgr_probe(struct work_struct *work)
2b8c19db	44	{
65f27f38 DH	45	struct cryptomgr_param *param =
65f27f38 DH	46	container_of(work, struct cryptomgr_param, work);
2b8c19db HX	47	struct crypto_template *tmpl;
2b8c19db HX	48	struct crypto_instance *inst;
6bfd4809	49	int err;
2b8c19db HX	50
	51	tmpl = crypto_lookup_template(param->template);
	52	if (!tmpl)
	53	goto err;
	54
6bfd4809 HX	55	do {
	56	inst = tmpl->alloc(&param->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));
2b8c19db HX	62
	63	crypto_tmpl_put(tmpl);
	64
6bfd4809 HX	65	if (err)
	66	goto err;
	67
2b8c19db HX	68	out:
	69	kfree(param);
	70	return;
	71
	72	err:
492e2b63 HX	73	crypto_larval_error(param->larval.name, param->larval.type,
492e2b63 HX	74	param->larval.mask);
2b8c19db HX	75	goto out;
	76	}
	77
	78	static 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);
492e2b63 HX	113	param->larval.type = larval->alg.cra_flags;
492e2b63 HX	114	param->larval.mask = larval->mask;
2b8c19db	115
65f27f38	116	INIT_WORK(&param->work, cryptomgr_probe);
2b8c19db HX	117	schedule_work(&param->work);
	118
	119	return NOTIFY_STOP;
	120
	121	err_free_param:
	122	kfree(param);
	123	err:
	124	return NOTIFY_OK;
	125	}
	126
	127	static 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
	138	static struct notifier_block cryptomgr_notifier = {
	139	.notifier_call = cryptomgr_notify,
	140	};
	141
	142	static int __init cryptomgr_init(void)
	143	{
	144	return crypto_register_notifier(&cryptomgr_notifier);
	145	}
	146
	147	static void __exit cryptomgr_exit(void)
	148	{
	149	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	150	BUG_ON(err);
	151	}
	152
	153	module_init(cryptomgr_init);
	154	module_exit(cryptomgr_exit);
	155
	156	MODULE_LICENSE("GPL");
	157	MODULE_DESCRIPTION("Crypto Algorithm Manager");