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/*-
* Copyright (c) 2015 Mark R V Murray
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/random.h>
#include <sys/sysctl.h>
#if defined(RANDOM_LOADABLE)
#include <sys/lock.h>
#include <sys/sx.h>
#endif
#include <dev/random/randomdev.h>
/* Set up the sysctl root node for the entropy device */
SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Cryptographically Secure Random Number Generator");
MALLOC_DEFINE(M_ENTROPY, "entropy", "Entropy harvesting buffers and data structures");
struct sources_head source_list = LIST_HEAD_INITIALIZER(source_list);
#if defined(RANDOM_LOADABLE)
struct random_algorithm *p_random_alg_context = NULL;
#else /* !defined(RANDOM_LOADABLE) */
struct random_algorithm *p_random_alg_context = &random_alg_context;
#endif /* defined(RANDOM_LOADABLE) */
#if defined(RANDOM_LOADABLE)
struct random_readers {
int (*read_random_uio)(struct uio *, bool);
u_int (*read_random)(void *, u_int);
} random_reader_context = {
(int (*)(struct uio *, bool))nullop,
(u_int (*)(void *, u_int))nullop,
};
struct sx randomdev_config_lock;
static void
random_infra_sysinit(void *dummy __unused)
{
RANDOM_CONFIG_INIT_LOCK();
}
SYSINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysinit, NULL);
void
random_infra_init(int (*p_random_read_uio)(struct uio *, bool), u_int (*p_random_read)(void *, u_int))
{
RANDOM_CONFIG_X_LOCK();
random_reader_context.read_random_uio = p_random_read_uio;
random_reader_context.read_random = p_random_read;
RANDOM_CONFIG_X_UNLOCK();
}
void
random_infra_uninit(void)
{
RANDOM_CONFIG_X_LOCK();
random_reader_context.read_random_uio = (int (*)(struct uio *, bool))nullop;
random_reader_context.read_random = (u_int (*)(void *, u_int))nullop;
RANDOM_CONFIG_X_UNLOCK();
}
static void
random_infra_sysuninit(void *dummy __unused)
{
RANDOM_CONFIG_DEINIT_LOCK();
}
SYSUNINIT(random_device_h_init, SI_SUB_RANDOM, SI_ORDER_FIRST, random_infra_sysuninit, NULL);
int
read_random_uio(struct uio *uio, bool nonblock)
{
int retval;
RANDOM_CONFIG_S_LOCK();
retval = random_reader_context.read_random_uio(uio, nonblock);
RANDOM_CONFIG_S_UNLOCK();
return (retval);
}
u_int
read_random(void *buf, u_int len)
{
u_int retval;
RANDOM_CONFIG_S_LOCK();
retval = random_reader_context.read_random(buf, len);
RANDOM_CONFIG_S_UNLOCK();
return (retval);
}
#endif /* defined(RANDOM_LOADABLE) */
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