sys/sys/random.h

   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.
  40  *
  41  */
  42
  43 /*
  44  * Many kernel routines will have a use for good random numbers,
  45  * for example, for truely random TCP sequence numbers, which prevent
  46  * certain forms of TCP spoofing attacks.
  47  *
  48  */
  49
  50 #ifndef _SYS_RANDOM_H_
  51 #define _SYS_RANDOM_H_
  52
  53 #ifndef _SYS_TYPES_H_
  54 #include <sys/types.h>
  55 #endif
  56 #ifndef _SYS_INTERRUPT_H_
  57 #include <sys/interrupt.h>
  58 #endif
  59 #ifndef _SYS_IOCCOM_H_
  60 #include <sys/ioccom.h>
  61 #endif
  62
  63 #define MEM_SETIRQ      _IOW('r', 1, u_int16_t) /* set interrupt */
  64 #define MEM_CLEARIRQ    _IOW('r', 2, u_int16_t) /* clear interrupt */
  65 #define MEM_RETURNIRQ   _IOR('r', 3, u_int16_t) /* obsolete */
  66 #define MEM_FINDIRQ     _IOWR('r', 4, u_int16_t) /* next interrupt */
  67
  68 #ifdef _KERNEL
  69
  70 /*
  71  * XXX: consider only statically allocating some, and allocating
  72  *      most others dynamically.
  73  */
  74 #define RAND_SRC_UNKNOWN        0x00
  75 #define RAND_SRC_SEEDING        0x01
  76 #define RAND_SRC_TIMING         0x02
  77 #define RAND_SRC_INTR           0x03
  78 #define RAND_SRC_RDRAND         0x04
  79 #define RAND_SRC_PADLOCK        0x05
  80 #define RAND_SRC_GLXSB          0x06
  81 #define RAND_SRC_HIFN           0x07
  82 #define RAND_SRC_UBSEC          0x08
  83 #define RAND_SRC_SAFE           0x09
  84
  85 /* Type of the cookie passed to add_interrupt_randomness. */
  86
  87 struct random_softc {
  88         int             sc_intr;
  89         int             sc_enabled;
  90 };
  91
  92 /* Exported functions */
  93
  94 void rand_initialize(void);
  95 void add_keyboard_randomness(u_char scancode);
  96 void add_interrupt_randomness(int intr);
  97 #ifdef notused
  98 void add_blkdev_randomness(int major);
  99 #endif
 100 int add_buffer_randomness(const char *, int);
 101 int add_buffer_randomness_src(const char *, int, int srcid);
 102
 103 #ifdef notused
 104 void get_random_bytes(void *buf, u_int nbytes);
 105 #endif
 106 u_int read_random(void *buf, u_int size);
 107 u_int read_random_unlimited(void *buf, u_int size);
 108 #ifdef notused
 109 u_int write_random(const char *buf, u_int nbytes);
 110 #endif
 111 struct thread;
 112 struct knote;
 113 int random_filter_read(struct knote *kn, long hint);
 114
 115 #endif /* _KERNEL */
 116
 117 #endif /* !_SYS_RANDOM_H_ */