1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright (c) 2018, Joyent, Inc.
  27  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
  28  */
  29 
  30 #ifndef _SYS_RANDOM_H
  31 #define _SYS_RANDOM_H
  32 
  33 #include <sys/types.h>
  34 #include <sys/atomic.h>
  35 
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39 
  40 /* stats for the random number devices, /dev/random and /dev/urandom. */
  41 typedef struct rnd_stats {
  42         uint64_t        rs_rndOut;      /* Bytes generated for /dev/random */
  43         uint64_t        rs_rndcOut;     /* Bytes read from /dev/random cache */
  44         uint64_t        rs_urndOut;     /* Bytes generated for /dev/urandom */
  45 } rnd_stats_t;
  46 
  47 /* stats for the kernel random number provider, swrand. */
  48 typedef struct swrand_stats {
  49         uint32_t        ss_entEst;      /* Entropy estimate in bits */
  50         uint64_t        ss_entIn;       /* Entropy bits added to pool */
  51         uint64_t        ss_entOut;      /* Entropy bits extracted from pool */
  52         uint64_t        ss_bytesIn;     /* Total data bytes added to pool */
  53         uint64_t        ss_bytesOut;    /* Total data bytes extracted from */
  54                                         /* the pool */
  55 } swrand_stats_t;
  56 
  57 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
  58 
  59 #define BUMP_CPU_RND_STATS(rm, x, v)    (((rm)->rm_mag.rm_stats).x += (v))
  60 #define BUMP_RND_STATS(x, v)    atomic_add_64(&(rnd_stats).x, (v))
  61 #define BUMP_SWRAND_STATS(x, v) atomic_add_64(&(swrand_stats).x, (v))
  62 
  63 extern int random_add_entropy(uint8_t *, size_t, uint_t);
  64 extern int random_get_bytes(uint8_t *, size_t);
  65 extern int random_get_blocking_bytes(uint8_t *, size_t);
  66 extern int random_get_pseudo_bytes(uint8_t *, size_t);
  67 
  68 #endif /* _KERNEL */
  69 
  70 /*
  71  * Flags for the getrandom(2) system call.
  72  */
  73 #define GRND_NONBLOCK   0x0001          /* O_NONBLOCK equiv */
  74 #define GRND_RANDOM     0x0002          /* Use /dev/random, not /dev/urandom */
  75 extern ssize_t getrandom(void *, size_t, unsigned int);
  76 
  77 #ifdef  __cplusplus
  78 }
  79 #endif
  80 
  81 #endif /* _SYS_RANDOM_H */