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 27#ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED 28#define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED 29 30#ifdef _KERNEL 31 32/* This header contains only those definitions that are global 33 * and non algorithm-specific for the entropy processor 34 */ 35 36#ifdef SYSCTL_DECL /* from sysctl.h */ 37SYSCTL_DECL(_kern_random); 38SYSCTL_DECL(_kern_random_initial_seeding); 39 40#define RANDOM_CHECK_UINT(name, min, max) \ 41static int \ 42random_check_uint_##name(SYSCTL_HANDLER_ARGS) \ 43{ \ 44 if (oidp->oid_arg1 != NULL) { \ 45 if (*(u_int *)(oidp->oid_arg1) <= (min)) \ 46 *(u_int *)(oidp->oid_arg1) = (min); \ 47 else if (*(u_int *)(oidp->oid_arg1) > (max)) \ 48 *(u_int *)(oidp->oid_arg1) = (max); \ 49 } \ 50 return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \ 51 req)); \ 52} 53#endif /* SYSCTL_DECL */ 54 55MALLOC_DECLARE(M_ENTROPY); 56 57extern bool random_bypass_before_seeding; 58extern bool read_random_bypassed_before_seeding; 59extern bool arc4random_bypassed_before_seeding; 60extern bool random_bypass_disable_warnings; 61 62#endif /* _KERNEL */ 63 64struct harvest_event; 65 66typedef void random_alg_init_t(void *); 67typedef void random_alg_deinit_t(void *); 68typedef void random_alg_pre_read_t(void); 69typedef void random_alg_read_t(uint8_t *, u_int); 70typedef bool random_alg_seeded_t(void); 71typedef void random_alg_reseed_t(void); 72typedef void random_alg_eventprocessor_t(struct harvest_event *); 73 74typedef u_int random_source_read_t(void *, u_int); 75 76/* 77 * Random Algorithm is a processor of randomness for the kernel 78 * and for userland. 79 */ 80struct random_algorithm { 81 const char *ra_ident; 82 u_int ra_poolcount; 83 void (*ra_init_alg)(void *); 84 void (*ra_deinit_alg)(void *); 85 random_alg_pre_read_t *ra_pre_read; 86 random_alg_read_t *ra_read; 87 random_alg_seeded_t *ra_seeded; 88 random_alg_eventprocessor_t *ra_event_processor; 89}; 90 91extern struct random_algorithm random_alg_context, *p_random_alg_context; 92 93#ifdef _KERNEL 94 95/* 96 * Random Source is a source of entropy that can provide 97 * specified or approximate amount of entropy immediately 98 * upon request. 99 */ 100struct random_source { 101 const char *rs_ident; 102 enum random_entropy_source rs_source; 103 random_source_read_t *rs_read; 104}; 105 106struct random_sources { 107 LIST_ENTRY(random_sources) rrs_entries; 108 struct random_source *rrs_source; 109}; 110 111LIST_HEAD(sources_head, random_sources); 112extern struct sources_head source_list; 113 114void random_source_register(struct random_source *); 115void random_source_deregister(struct random_source *); 116 117#if defined(RANDOM_LOADABLE) 118extern struct sx randomdev_config_lock; 119#define RANDOM_CONFIG_INIT_LOCK(x) sx_init(&randomdev_config_lock, "configuration change lock") 120#define RANDOM_CONFIG_X_LOCK(x) sx_xlock(&randomdev_config_lock) 121#define RANDOM_CONFIG_X_UNLOCK(x) sx_xunlock(&randomdev_config_lock) 122#define RANDOM_CONFIG_S_LOCK(x) sx_slock(&randomdev_config_lock) 123#define RANDOM_CONFIG_S_UNLOCK(x) sx_sunlock(&randomdev_config_lock) 124#define RANDOM_CONFIG_DEINIT_LOCK(x) sx_destroy(&randomdev_config_lock) 125void random_infra_init(int (*)(struct uio *, bool), u_int (*)(void *, u_int)); 126void random_infra_uninit(void); 127#endif 128 129#endif /* _KERNEL */ 130 131void randomdev_unblock(void); 132 133#endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */ 134