kernel: Bring in a port of FreeBSD's virtio_random(4) driver.
[dragonfly.git] / sys / sys / random.h
CommitLineData
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1/*
2 * random.h -- A strong random number generator
3 *
4 * $FreeBSD: src/sys/sys/random.h,v 1.19.2.2 2002/09/17 17:11:54 sam Exp $
5 *
6 * Version 0.95, last modified 18-Oct-95
7 *
8 * Copyright Theodore Ts'o, 1994, 1995. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, and the entire permission notice in its entirety,
15 * including the disclaimer of warranties.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 * products derived from this software without specific prior
21 * written permission.
22 *
23 * ALTERNATIVELY, this product may be distributed under the terms of
24 * the GNU Public License, in which case the provisions of the GPL are
25 * required INSTEAD OF the above restrictions. (This clause is
26 * necessary due to a potential bad interaction between the GPL and
27 * the restrictions contained in a BSD-style copyright.)
28 *
29 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
32 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
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40 */
41
42/*
43 * Many kernel routines will have a use for good random numbers,
446b4829 44 * for example, for truly random TCP sequence numbers, which prevent
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45 * certain forms of TCP spoofing attacks.
46 *
47 */
48
49#ifndef _SYS_RANDOM_H_
50#define _SYS_RANDOM_H_
51
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52#ifndef _SYS_TYPES_H_
53#include <sys/types.h>
54#endif
1bd40720 55#ifndef _SYS_IOCCOM_H_
984263bc 56#include <sys/ioccom.h>
1bd40720 57#endif
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58
59#define MEM_SETIRQ _IOW('r', 1, u_int16_t) /* set interrupt */
60#define MEM_CLEARIRQ _IOW('r', 2, u_int16_t) /* clear interrupt */
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61#define MEM_RETURNIRQ _IOR('r', 3, u_int16_t) /* obsolete */
62#define MEM_FINDIRQ _IOWR('r', 4, u_int16_t) /* next interrupt */
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63
64#ifdef _KERNEL
65
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66/*
67 * XXX: consider only statically allocating some, and allocating
68 * most others dynamically.
69 */
70#define RAND_SRC_UNKNOWN 0x00
71#define RAND_SRC_SEEDING 0x01
72#define RAND_SRC_TIMING 0x02
73#define RAND_SRC_INTR 0x03
74#define RAND_SRC_RDRAND 0x04
75#define RAND_SRC_PADLOCK 0x05
76#define RAND_SRC_GLXSB 0x06
77#define RAND_SRC_HIFN 0x07
78#define RAND_SRC_UBSEC 0x08
79#define RAND_SRC_SAFE 0x09
0625343f 80#define RAND_SRC_VIRTIO 0x0a
790110cd 81
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82/* Type of the cookie passed to add_interrupt_randomness. */
83
84struct random_softc {
984263bc 85 int sc_intr;
7e071e7a 86 int sc_enabled;
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87};
88
89/* Exported functions */
90
91void rand_initialize(void);
92void add_keyboard_randomness(u_char scancode);
7e071e7a 93void add_interrupt_randomness(int intr);
bcce56a4 94int add_buffer_randomness(const char *, int);
790110cd 95int add_buffer_randomness_src(const char *, int, int srcid);
984263bc 96
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97u_int read_random(void *buf, u_int size);
98u_int read_random_unlimited(void *buf, u_int size);
6dcd6ba9 99struct knote;
6dcd6ba9 100int random_filter_read(struct knote *kn, long hint);
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101
102#endif /* _KERNEL */
103
104#endif /* !_SYS_RANDOM_H_ */