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/*
* An OCF module for determining the cost of crypto versus the cost of
* IPSec processing outside of OCF. This modules gives us the effect of
* zero cost encryption, of course you will need to run it at both ends
* since it does no crypto at all.
*
* Written by David McCullough <david_mccullough@mcafee.com>
* Copyright (C) 2006-2010 David McCullough
*
* LICENSE TERMS
*
* The free distribution and use of this software in both source and binary
* form is allowed (with or without changes) provided that:
*
* 1. distributions of this source code include the above copyright
* notice, this list of conditions and the following disclaimer;
*
* 2. distributions in binary form include the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other associated materials;
*
* 3. the copyright holder's name is not used to endorse products
* built using this software without specific written permission.
*
* ALTERNATIVELY, provided that this notice is retained in full, this product
* may be distributed under the terms of the GNU General Public License (GPL),
* in which case the provisions of the GPL apply INSTEAD OF those given above.
*
* DISCLAIMER
*
* This software is provided 'as is' with no explicit or implied warranties
* in respect of its properties, including, but not limited to, correctness
* and/or fitness for purpose.
*/
#ifndef AUTOCONF_INCLUDED
#include <linux/config.h>
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/crypto.h>
#include <linux/interrupt.h>
#include <cryptodev.h>
#include <uio.h>
static int32_t null_id = -1;
static u_int32_t null_sesnum = 0;
static int null_process(device_t, struct cryptop *, int);
static int null_newsession(device_t, u_int32_t *, struct cryptoini *);
static int null_freesession(device_t, u_int64_t);
#define debug ocfnull_debug
int ocfnull_debug = 0;
module_param(ocfnull_debug, int, 0644);
MODULE_PARM_DESC(ocfnull_debug, "Enable debug");
/*
* dummy device structure
*/
static struct {
softc_device_decl sc_dev;
} nulldev;
static device_method_t null_methods = {
/* crypto device methods */
DEVMETHOD(cryptodev_newsession, null_newsession),
DEVMETHOD(cryptodev_freesession,null_freesession),
DEVMETHOD(cryptodev_process, null_process),
};
/*
* Generate a new software session.
*/
static int
null_newsession(device_t arg, u_int32_t *sid, struct cryptoini *cri)
{
dprintk("%s()\n", __FUNCTION__);
if (sid == NULL || cri == NULL) {
dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
return EINVAL;
}
if (null_sesnum == 0)
null_sesnum++;
*sid = null_sesnum++;
return 0;
}
/*
* Free a session.
*/
static int
null_freesession(device_t arg, u_int64_t tid)
{
u_int32_t sid = CRYPTO_SESID2LID(tid);
dprintk("%s()\n", __FUNCTION__);
if (sid > null_sesnum) {
dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
return EINVAL;
}
/* Silently accept and return */
if (sid == 0)
return 0;
return 0;
}
/*
* Process a request.
*/
static int
null_process(device_t arg, struct cryptop *crp, int hint)
{
unsigned int lid;
dprintk("%s()\n", __FUNCTION__);
/* Sanity check */
if (crp == NULL) {
dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
return EINVAL;
}
crp->crp_etype = 0;
if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
crp->crp_etype = EINVAL;
goto done;
}
/*
* find the session we are using
*/
lid = crp->crp_sid & 0xffffffff;
if (lid >= null_sesnum || lid == 0) {
crp->crp_etype = ENOENT;
dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
goto done;
}
done:
crypto_done(crp);
return 0;
}
/*
* our driver startup and shutdown routines
*/
static int
null_init(void)
{
dprintk("%s(%p)\n", __FUNCTION__, null_init);
memset(&nulldev, 0, sizeof(nulldev));
softc_device_init(&nulldev, "ocfnull", 0, null_methods);
null_id = crypto_get_driverid(softc_get_device(&nulldev),
CRYPTOCAP_F_HARDWARE);
if (null_id < 0)
panic("ocfnull: crypto device cannot initialize!");
#define REGISTER(alg) \
crypto_register(null_id,alg,0,0)
REGISTER(CRYPTO_DES_CBC);
REGISTER(CRYPTO_3DES_CBC);
REGISTER(CRYPTO_RIJNDAEL128_CBC);
REGISTER(CRYPTO_MD5);
REGISTER(CRYPTO_SHA1);
REGISTER(CRYPTO_MD5_HMAC);
REGISTER(CRYPTO_SHA1_HMAC);
#undef REGISTER
return 0;
}
static void
null_exit(void)
{
dprintk("%s()\n", __FUNCTION__);
crypto_unregister_all(null_id);
null_id = -1;
}
module_init(null_init);
module_exit(null_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
MODULE_DESCRIPTION("ocfnull - claims a lot but does nothing");
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