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3aa77530ca
- Tweek man page. - Remove all mention of RANDOM_FORTUNA. If the system owner wants YARROW or DUMMY, they ask for it, otherwise they get FORTUNA. - Tidy up headers a bit. - Tidy up declarations a bit. - Make static in a couple of places where needed. - Move Yarrow/Fortuna SYSINIT/SYSUNINIT to randomdev.c, moving us towards a single file where the algorithm context is used. - Get rid of random_*_process_buffer() functions. They were only used in one place each, and are better subsumed into those places. - Remove *_post_read() functions as they are stubs everywhere. - Assert against buffer size illegalities. - Clean up some silly code in the randomdev_read() routine. - Make the harvesting more consistent. - Make some requested argument name changes. - Tidy up and clarify a few comments. - Make some requested comment changes. - Make some requested macro changes. * NOTE: the thing calling itself a 'unit test' is not yet a proper unit test, but it helps me ensure things work. It may be a proper unit test at some time in the future, but for now please don't make any assumptions or hold any expectations. Differential Revision: https://reviews.freebsd.org/D2025 Approved by: so (/dev/random blanket)
122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/*-
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* Copyright (c) 2000-2015 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
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#define SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED
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#ifdef _KERNEL
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/* This header contains only those definitions that are global
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* and non algorithm-specific for the entropy processor
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*/
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#ifdef SYSCTL_DECL /* from sysctl.h */
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SYSCTL_DECL(_kern_random);
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#define RANDOM_CHECK_UINT(name, min, max) \
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static int \
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random_check_uint_##name(SYSCTL_HANDLER_ARGS) \
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{ \
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if (oidp->oid_arg1 != NULL) { \
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if (*(u_int *)(oidp->oid_arg1) <= (min)) \
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*(u_int *)(oidp->oid_arg1) = (min); \
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else if (*(u_int *)(oidp->oid_arg1) > (max)) \
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*(u_int *)(oidp->oid_arg1) = (max); \
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} \
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return (sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, \
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req)); \
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}
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#endif /* SYSCTL_DECL */
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MALLOC_DECLARE(M_ENTROPY);
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#define RANDOM_ALG_READ_RATE_MINIMUM 32
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#endif /* _KERNEL */
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struct harvest_event;
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typedef void random_alg_pre_read_t(void);
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typedef void random_alg_read_t(uint8_t *, u_int);
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typedef void random_alg_write_t(uint8_t *, u_int);
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typedef int random_alg_seeded_t(void);
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typedef void random_alg_reseed_t(void);
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typedef void random_alg_eventprocessor_t(struct harvest_event *);
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typedef u_int random_source_read_t(void *, u_int);
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/*
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* Random Algorithm is a processor of randomness for the kernel
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* and for userland.
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*/
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struct random_algorithm {
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const char *ra_ident;
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u_int ra_poolcount;
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void (*ra_init_alg)(void *);
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void (*ra_deinit_alg)(void *);
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random_alg_pre_read_t *ra_pre_read;
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random_alg_read_t *ra_read;
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random_alg_write_t *ra_write;
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random_alg_reseed_t *ra_reseed;
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random_alg_seeded_t *ra_seeded;
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random_alg_eventprocessor_t *ra_event_processor;
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};
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extern struct random_algorithm random_alg_context;
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#ifdef _KERNEL
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/*
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* Random Source is a source of entropy that can provide
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* specified or approximate amount of entropy immediately
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* upon request.
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*/
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struct random_source {
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const char *rs_ident;
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enum random_entropy_source rs_source;
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random_source_read_t *rs_read;
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};
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#if !defined(RANDOM_DUMMY)
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struct random_sources {
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LIST_ENTRY(random_sources) rrs_entries;
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struct random_source *rrs_source;
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};
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#endif /* !defined(RANDOM_DUMMY) */
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void random_source_register(struct random_source *);
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void random_source_deregister(struct random_source *);
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void random_sources_feed(void);
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#endif /* _KERNEL */
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void randomdev_unblock(void);
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#endif /* SYS_DEV_RANDOM_RANDOMDEV_H_INCLUDED */
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