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 */ 37 SYSCTL_DECL(_kern_random); 38 SYSCTL_DECL(_kern_random_initial_seeding); 39 40 #define RANDOM_CHECK_UINT(name, min, max) \ 41 static int \ 42 random_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 55 MALLOC_DECLARE(M_ENTROPY); 56 57 extern bool random_bypass_before_seeding; 58 extern bool read_random_bypassed_before_seeding; 59 extern bool arc4random_bypassed_before_seeding; 60 extern bool random_bypass_disable_warnings; 61 62 #endif /* _KERNEL */ 63 64 struct harvest_event; 65 66 typedef void random_alg_pre_read_t(void); 67 typedef void random_alg_read_t(uint8_t *, size_t); 68 typedef bool random_alg_seeded_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 random_alg_pre_read_t *ra_pre_read; 81 random_alg_read_t *ra_read; 82 random_alg_seeded_t *ra_seeded; 83 random_alg_eventprocessor_t *ra_event_processor; 84 }; 85 86 #if defined(RANDOM_LOADABLE) 87 extern const struct random_algorithm *p_random_alg_context; 88 #else 89 extern const struct random_algorithm random_alg_context; 90 #define p_random_alg_context (&random_alg_context) 91 #endif 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 */ 100 struct random_source { 101 const char *rs_ident; 102 enum random_entropy_source rs_source; 103 random_source_read_t *rs_read; 104 }; 105 106 void random_source_register(struct random_source *); 107 void random_source_deregister(struct random_source *); 108 109 #endif /* _KERNEL */ 110 111 void randomdev_unblock(void); 112 113 #endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */ 114