1 /*- 2 * Copyright (c) 2000-2015 Mark R V Murray 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED 30 #define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED 31 32 #ifdef _KERNEL 33 34 /* This header contains only those definitions that are global 35 * and non algorithm-specific for the entropy processor 36 */ 37 38 #ifdef SYSCTL_DECL /* from sysctl.h */ 39 SYSCTL_DECL(_kern_random); 40 41 #define RANDOM_CHECK_UINT(name, min, max) \ 42 static int \ 43 random_check_uint_##name(SYSCTL_HANDLER_ARGS) \ 44 { \ 45 if (oidp->oid_arg1 != NULL) { \ 46 if (*(u_int *)(oidp->oid_arg1) <= (min)) \ 47 *(u_int *)(oidp->oid_arg1) = (min); \ 48 else if (*(u_int *)(oidp->oid_arg1) > (max)) \ 49 *(u_int *)(oidp->oid_arg1) = (max); \ 50 } \ 51 return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \ 52 req)); \ 53 } 54 #endif /* SYSCTL_DECL */ 55 56 MALLOC_DECLARE(M_ENTROPY); 57 58 #define RANDOM_ALG_READ_RATE_MINIMUM 32 59 60 #endif /* _KERNEL */ 61 62 struct harvest_event; 63 64 typedef void random_alg_pre_read_t(void); 65 typedef void random_alg_read_t(uint8_t *, u_int); 66 typedef void random_alg_write_t(uint8_t *, u_int); 67 typedef int random_alg_seeded_t(void); 68 typedef void random_alg_reseed_t(void); 69 typedef void random_alg_eventprocessor_t(struct harvest_event *); 70 71 typedef u_int random_source_read_t(void *, u_int); 72 73 /* 74 * Random Algorithm is a processor of randomness for the kernel 75 * and for userland. 76 */ 77 struct random_algorithm { 78 const char *ra_ident; 79 u_int ra_poolcount; 80 void (*ra_init_alg)(void *); 81 void (*ra_deinit_alg)(void *); 82 random_alg_pre_read_t *ra_pre_read; 83 random_alg_read_t *ra_read; 84 random_alg_write_t *ra_write; 85 random_alg_reseed_t *ra_reseed; 86 random_alg_seeded_t *ra_seeded; 87 random_alg_eventprocessor_t *ra_event_processor; 88 }; 89 90 extern struct random_algorithm random_alg_context; 91 92 #ifdef _KERNEL 93 94 /* 95 * Random Source is a source of entropy that can provide 96 * specified or approximate amount of entropy immediately 97 * upon request. 98 */ 99 struct random_source { 100 const char *rs_ident; 101 enum random_entropy_source rs_source; 102 random_source_read_t *rs_read; 103 }; 104 105 #if !defined(RANDOM_DUMMY) 106 struct random_sources { 107 LIST_ENTRY(random_sources) rrs_entries; 108 struct random_source *rrs_source; 109 }; 110 #endif /* !defined(RANDOM_DUMMY) */ 111 112 void random_source_register(struct random_source *); 113 void random_source_deregister(struct random_source *); 114 115 void random_sources_feed(void); 116 117 #endif /* _KERNEL */ 118 119 void randomdev_unblock(void); 120 121 #endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */ 122