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/*-
* Copyright (c) 2000-2015 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.
*
* $FreeBSD$
*/
#ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
#define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
#ifdef _KERNEL
/* This header contains only those definitions that are global
* and non algorithm-specific for the entropy processor
*/
#ifdef SYSCTL_DECL /* from sysctl.h */
SYSCTL_DECL(_kern_random);
#define RANDOM_CHECK_UINT(name, min, max) \
static int \
random_check_uint_##name(SYSCTL_HANDLER_ARGS) \
{ \
if (oidp->oid_arg1 != NULL) { \
if (*(u_int *)(oidp->oid_arg1) <= (min)) \
*(u_int *)(oidp->oid_arg1) = (min); \
else if (*(u_int *)(oidp->oid_arg1) > (max)) \
*(u_int *)(oidp->oid_arg1) = (max); \
} \
return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \
req)); \
}
#endif /* SYSCTL_DECL */
MALLOC_DECLARE(M_ENTROPY);
#endif /* _KERNEL */
struct harvest_event;
typedef void random_alg_init_t(void *);
typedef void random_alg_deinit_t(void *);
typedef void random_alg_pre_read_t(void);
typedef void random_alg_read_t(uint8_t *, u_int);
typedef bool random_alg_seeded_t(void);
typedef void random_alg_reseed_t(void);
typedef void random_alg_eventprocessor_t(struct harvest_event *);
typedef u_int random_source_read_t(void *, u_int);
/*
* Random Algorithm is a processor of randomness for the kernel
* and for userland.
*/
struct random_algorithm {
const char *ra_ident;
u_int ra_poolcount;
void (*ra_init_alg)(void *);
void (*ra_deinit_alg)(void *);
random_alg_pre_read_t *ra_pre_read;
random_alg_read_t *ra_read;
random_alg_seeded_t *ra_seeded;
random_alg_eventprocessor_t *ra_event_processor;
};
extern struct random_algorithm random_alg_context, *p_random_alg_context;
#ifdef _KERNEL
/*
* Random Source is a source of entropy that can provide
* specified or approximate amount of entropy immediately
* upon request.
*/
struct random_source {
const char *rs_ident;
enum random_entropy_source rs_source;
random_source_read_t *rs_read;
};
struct random_sources {
LIST_ENTRY(random_sources) rrs_entries;
struct random_source *rrs_source;
};
LIST_HEAD(sources_head, random_sources);
extern struct sources_head source_list;
void random_source_register(struct random_source *);
void random_source_deregister(struct random_source *);
#if defined(RANDOM_LOADABLE)
extern struct sx randomdev_config_lock;
#define RANDOM_CONFIG_INIT_LOCK(x) sx_init(&randomdev_config_lock, "configuration change lock")
#define RANDOM_CONFIG_X_LOCK(x) sx_xlock(&randomdev_config_lock)
#define RANDOM_CONFIG_X_UNLOCK(x) sx_xunlock(&randomdev_config_lock)
#define RANDOM_CONFIG_S_LOCK(x) sx_slock(&randomdev_config_lock)
#define RANDOM_CONFIG_S_UNLOCK(x) sx_sunlock(&randomdev_config_lock)
#define RANDOM_CONFIG_DEINIT_LOCK(x) sx_destroy(&randomdev_config_lock)
void random_infra_init(int (*)(struct uio *, bool), u_int (*)(void *, u_int));
void random_infra_uninit(void);
#endif
#endif /* _KERNEL */
void randomdev_unblock(void);
#endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */
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