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  * Many kernel routines will have a use for good random numbers,
  44  * for example, for truly random TCP sequence numbers, which prevent
  45  * certain forms of TCP spoofing attacks.
  46  *
  47  */
  48
  49 #ifndef _SYS_RANDOM_H_
  50 #define _SYS_RANDOM_H_
  51
  52 #ifndef _SYS_TYPES_H_
  53 #include <sys/types.h>
  54 #endif
  55 #ifndef _SYS_IOCCOM_H_
  56 #include <sys/ioccom.h>
  57 #endif
  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 */
  61 #define MEM_RETURNIRQ   _IOR('r', 3, u_int16_t) /* obsolete */
  62 #define MEM_FINDIRQ     _IOWR('r', 4, u_int16_t) /* next interrupt */
  63
  64 #ifdef _KERNEL
  65
  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
  80 #define RAND_SRC_VIRTIO         0x0a
  81
  82 /* Type of the cookie passed to add_interrupt_randomness. */
  83
  84 struct random_softc {
  85         int             sc_intr;
  86         int             sc_enabled;
  87 };
  88
  89 /* Exported functions */
  90
  91 void rand_initialize(void);
  92 void add_keyboard_randomness(u_char scancode);
  93 void add_interrupt_randomness(int intr);
  94 int add_buffer_randomness(const char *, int);
  95 int add_buffer_randomness_src(const char *, int, int srcid);
  96
  97 u_int read_random(void *buf, u_int size);
  98 u_int read_random_unlimited(void *buf, u_int size);
  99 struct knote;
 100 int random_filter_read(struct knote *kn, long hint);
 101
 102 #endif /* _KERNEL */
 103
 104 #endif /* !_SYS_RANDOM_H_ */