/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2000-2015, 2017 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_RANDOM_H_
#define _SYS_RANDOM_H_
#include <sys/types.h>
#ifdef _KERNEL
struct uio;
/*
* In the loadable random world, there are set of dangling pointers left in the
* core kernel:
* * read_random, read_random_uio, is_random_seeded are function pointers,
* rather than functions.
* * p_random_alg_context is a true pointer in loadable random kernels.
*
* These are initialized at SI_SUB_RANDOM:SI_ORDER_SECOND during boot. The
* read-type pointers are initialized by random_alg_context_init() in
* randomdev.c and p_random_alg_context in the algorithm, e.g., fortuna.c's
* random_fortuna_init_alg(). The nice thing about function pointers is they
* have a similar calling convention to ordinary functions.
*
* (In !loadable, the read_random, etc, routines are just plain functions;
* p_random_alg_context is a macro for the public visibility
* &random_alg_context.)
*/
#if defined(RANDOM_LOADABLE)
extern void (*_read_random)(void *, u_int);
extern int (*_read_random_uio)(struct uio *, bool);
extern bool (*_is_random_seeded)(void);
#define read_random(a, b) (*_read_random)(a, b)
#define read_random_uio(a, b) (*_read_random_uio)(a, b)
#define is_random_seeded() (*_is_random_seeded)()
#else
void read_random(void *, u_int);
int read_random_uio(struct uio *, bool);
bool is_random_seeded(void);
#endif
/*
* Note: if you add or remove members of random_entropy_source, remember to
* also update the strings in the static array random_source_descr[] in
* random_harvestq.c.
*/
enum random_entropy_source {
RANDOM_START = 0,
RANDOM_CACHED = 0,
/* Environmental sources */
RANDOM_ATTACH,
RANDOM_KEYBOARD,
RANDOM_MOUSE,
RANDOM_NET_TUN,
RANDOM_NET_ETHER,
RANDOM_NET_NG,
RANDOM_INTERRUPT,
RANDOM_SWI,
RANDOM_FS_ATIME,
RANDOM_UMA, /* Special!! UMA/SLAB Allocator */
RANDOM_ENVIRONMENTAL_END = RANDOM_UMA,
/* Fast hardware random-number sources from here on. */
RANDOM_PURE_START,
RANDOM_PURE_OCTEON = RANDOM_PURE_START,
RANDOM_PURE_SAFE,
RANDOM_PURE_GLXSB,
RANDOM_PURE_HIFN,
RANDOM_PURE_RDRAND,
RANDOM_PURE_NEHEMIAH,
RANDOM_PURE_RNDTEST,
RANDOM_PURE_VIRTIO,
RANDOM_PURE_BROADCOM,
RANDOM_PURE_CCP,
RANDOM_PURE_DARN,
RANDOM_PURE_TPM,
RANDOM_PURE_VMGENID,
ENTROPYSOURCE
};
_Static_assert(ENTROPYSOURCE <= 32,
"hardcoded assumption that values fit in a typical word-sized bitset");
#define RANDOM_CACHED_BOOT_ENTROPY_MODULE "boot_entropy_cache"
extern u_int hc_source_mask;
void random_harvest_queue_(const void *, u_int, enum random_entropy_source);
void random_harvest_fast_(const void *, u_int);
void random_harvest_direct_(const void *, u_int, enum random_entropy_source);
static __inline void
random_harvest_queue(const void *entropy, u_int size, enum random_entropy_source origin)
{
if (hc_source_mask & (1 << origin))
random_harvest_queue_(entropy, size, origin);
}
static __inline void
random_harvest_fast(const void *entropy, u_int size, enum random_entropy_source origin)
{
if (hc_source_mask & (1 << origin))
random_harvest_fast_(entropy, size);
}
static __inline void
random_harvest_direct(const void *entropy, u_int size, enum random_entropy_source origin)
{
if (hc_source_mask & (1 << origin))
random_harvest_direct_(entropy, size, origin);
}
void random_harvest_register_source(enum random_entropy_source);
void random_harvest_deregister_source(enum random_entropy_source);
#if defined(RANDOM_ENABLE_UMA)
#define random_harvest_fast_uma(a, b, c) random_harvest_fast(a, b, c)
#else /* !defined(RANDOM_ENABLE_UMA) */
#define random_harvest_fast_uma(a, b, c) do {} while (0)
#endif /* defined(RANDOM_ENABLE_UMA) */
#if defined(RANDOM_ENABLE_ETHER)
#define random_harvest_queue_ether(a, b) random_harvest_queue(a, b, RANDOM_NET_ETHER)
#else /* !defined(RANDOM_ENABLE_ETHER) */
#define random_harvest_queue_ether(a, b) do {} while (0)
#endif /* defined(RANDOM_ENABLE_ETHER) */
#endif /* _KERNEL */
#define GRND_NONBLOCK 0x1
#define GRND_RANDOM 0x2
#define GRND_INSECURE 0x4
__BEGIN_DECLS
ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
__END_DECLS
#endif /* _SYS_RANDOM_H_ */
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