2 * Copyright (c) 2000-2015 Mark R V Murray
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
29 #ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
30 #define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
34 /* This header contains only those definitions that are global
35 * and non algorithm-specific for the entropy processor
38 #ifdef SYSCTL_DECL /* from sysctl.h */
39 SYSCTL_DECL(_kern_random);
41 #define RANDOM_CHECK_UINT(name, min, max) \
43 random_check_uint_##name(SYSCTL_HANDLER_ARGS) \
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); \
51 return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \
54 #endif /* SYSCTL_DECL */
56 MALLOC_DECLARE(M_ENTROPY);
62 typedef void random_alg_init_t(void *);
63 typedef void random_alg_deinit_t(void *);
64 typedef void random_alg_pre_read_t(void);
65 typedef void random_alg_read_t(uint8_t *, u_int);
66 typedef bool random_alg_seeded_t(void);
67 typedef void random_alg_reseed_t(void);
68 typedef void random_alg_eventprocessor_t(struct harvest_event *);
70 typedef u_int random_source_read_t(void *, u_int);
73 * Random Algorithm is a processor of randomness for the kernel
76 struct random_algorithm {
79 void (*ra_init_alg)(void *);
80 void (*ra_deinit_alg)(void *);
81 random_alg_pre_read_t *ra_pre_read;
82 random_alg_read_t *ra_read;
83 random_alg_seeded_t *ra_seeded;
84 random_alg_eventprocessor_t *ra_event_processor;
87 extern struct random_algorithm random_alg_context, *p_random_alg_context;
92 * Random Source is a source of entropy that can provide
93 * specified or approximate amount of entropy immediately
96 struct random_source {
98 enum random_entropy_source rs_source;
99 random_source_read_t *rs_read;
102 struct random_sources {
103 LIST_ENTRY(random_sources) rrs_entries;
104 struct random_source *rrs_source;
107 LIST_HEAD(sources_head, random_sources);
108 extern struct sources_head source_list;
110 void random_source_register(struct random_source *);
111 void random_source_deregister(struct random_source *);
113 #if defined(RANDOM_LOADABLE)
114 extern struct sx randomdev_config_lock;
115 #define RANDOM_CONFIG_INIT_LOCK(x) sx_init(&randomdev_config_lock, "configuration change lock")
116 #define RANDOM_CONFIG_X_LOCK(x) sx_xlock(&randomdev_config_lock)
117 #define RANDOM_CONFIG_X_UNLOCK(x) sx_xunlock(&randomdev_config_lock)
118 #define RANDOM_CONFIG_S_LOCK(x) sx_slock(&randomdev_config_lock)
119 #define RANDOM_CONFIG_S_UNLOCK(x) sx_sunlock(&randomdev_config_lock)
120 #define RANDOM_CONFIG_DEINIT_LOCK(x) sx_destroy(&randomdev_config_lock)
121 void random_infra_init(int (*)(struct uio *, bool), u_int (*)(void *, u_int));
122 void random_infra_uninit(void);
127 void randomdev_unblock(void);
129 #endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */