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/*
* Driver for /dev/crypto device (aka CryptoDev)
*
* Copyright (c) 2004 Michal Ludvig <mludvig@logix.net.nz>, SuSE Labs
* Copyright (c) 2009,2010 Nikos Mavrogiannopoulos <nmav@gnutls.org>
*
* This file is part of linux cryptodev.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/*
* Device /dev/crypto provides an interface for
* accessing kernel CryptoAPI algorithms (ciphers,
* hashes) from userspace programs.
*
* /dev/crypto interface was originally introduced in
* OpenBSD and this module attempts to keep the API.
*
*/
#include <linux/crypto.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/ioctl.h>
#include <linux/random.h>
#include <linux/syscalls.h>
#include <linux/pagemap.h>
#include <linux/uaccess.h>
#include <linux/scatterlist.h>
#include "cryptodev_int.h"
#include "ncr-int.h"
#include <linux/version.h>
#include "version.h"
MODULE_AUTHOR("Nikos Mavrogiannopoulos <nmav@gnutls.org>");
MODULE_DESCRIPTION("CryptoDev driver");
MODULE_LICENSE("GPL");
/* ====== Module parameters ====== */
int cryptodev_verbosity = 0;
module_param(cryptodev_verbosity, int, 0644);
MODULE_PARM_DESC(cryptodev_verbosity, "0: normal, 1: verbose, 2: debug");
/* ====== CryptoAPI ====== */
void release_user_pages(struct page **pg, int pagecount)
{
while (pagecount--) {
if (!PageReserved(pg[pagecount]))
SetPageDirty(pg[pagecount]);
page_cache_release(pg[pagecount]);
}
}
/* offset of buf in it's first page */
#define PAGEOFFSET(buf) ((unsigned long)buf & ~PAGE_MASK)
/* fetch the pages addr resides in into pg and initialise sg with them */
int __get_userbuf(uint8_t __user * addr, uint32_t len, int write,
int pgcount, struct page **pg, struct scatterlist *sg)
{
int ret, pglen, i = 0;
struct scatterlist *sgp;
down_write(¤t->mm->mmap_sem);
ret = get_user_pages(current, current->mm,
(unsigned long)addr, pgcount, write, 0, pg, NULL);
up_write(¤t->mm->mmap_sem);
if (ret != pgcount)
return -EINVAL;
sg_init_table(sg, pgcount);
pglen =
min((ptrdiff_t) (PAGE_SIZE - PAGEOFFSET(addr)), (ptrdiff_t) len);
sg_set_page(sg, pg[i++], pglen, PAGEOFFSET(addr));
len -= pglen;
for (sgp = sg_next(sg); len; sgp = sg_next(sgp)) {
pglen = min((uint32_t) PAGE_SIZE, len);
sg_set_page(sgp, pg[i++], pglen, 0);
len -= pglen;
}
sg_mark_end(sg_last(sg, pgcount));
return 0;
}
/* ====== /dev/crypto ====== */
static int cryptodev_open(struct inode *inode, struct file *filp)
{
void *ncr;
ncr = ncr_init_lists();
if (ncr == NULL) {
return -ENOMEM;
}
filp->private_data = ncr;
return 0;
}
static int cryptodev_release(struct inode *inode, struct file *filp)
{
void *ncr = filp->private_data;
if (ncr) {
ncr_deinit_lists(ncr);
filp->private_data = NULL;
}
return 0;
}
static long
cryptodev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
void *ncr = filp->private_data;
if (unlikely(!ncr))
BUG();
return ncr_ioctl(ncr, cmd, arg);
}
/* compatibility code for 32bit userlands */
#ifdef CONFIG_COMPAT
static long
cryptodev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
void *ncr = file->private_data;
if (unlikely(!ncr))
BUG();
return ncr_compat_ioctl(ncr, cmd, arg);
}
#endif /* CONFIG_COMPAT */
static const struct file_operations cryptodev_fops = {
.owner = THIS_MODULE,
.open = cryptodev_open,
.release = cryptodev_release,
.unlocked_ioctl = cryptodev_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = cryptodev_compat_ioctl,
#endif /* CONFIG_COMPAT */
};
static struct miscdevice cryptodev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "crypto",
.fops = &cryptodev_fops,
};
static int __init cryptodev_register(void)
{
int rc;
ncr_limits_init();
ncr_master_key_reset();
rc = misc_register(&cryptodev);
if (unlikely(rc)) {
ncr_limits_deinit();
printk(KERN_ERR PFX "registration of /dev/crypto failed\n");
return rc;
}
return 0;
}
static void __exit cryptodev_deregister(void)
{
misc_deregister(&cryptodev);
ncr_limits_deinit();
}
/* ====== Module init/exit ====== */
static int __init init_cryptodev(void)
{
int rc;
rc = cryptodev_register();
if (unlikely(rc))
return rc;
printk(KERN_INFO PFX "driver %s loaded.\n", VERSION);
return 0;
}
static void __exit exit_cryptodev(void)
{
cryptodev_deregister();
printk(KERN_INFO PFX "driver unloaded.\n");
}
module_init(init_cryptodev);
module_exit(exit_cryptodev);
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