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/*
* 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(¶m->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(¶m->work, cryptomgr_probe);
schedule_work(¶m->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");
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