5711939b63
random_adaptor is basically an adapter that plugs in to random(4). random_adaptor can only be plugged in to random(4) very early in bootup. Unplugging random_adaptor from random(4) is not supported, and is probably a bad idea anyway, due to potential loss of entropy pools. We currently have 3 random_adaptors: + yarrow + rdrand (ivy.c) + nehemeiah * Remove platform dependent logic from probe.c, and move it into corresponding registration routines of each random_adaptor provider. probe.c doesn't do anything other than picking a specific random_adaptor from a list of registered ones. * If the kernel doesn't have any random_adaptor adapters present then the creation of /dev/random is postponed until next random_adaptor is kldload'ed. * Fix randomdev_soft.c to refer to its own random_adaptor, instead of a system wide one. Submitted by: arthurmesh@gmail.com, obrien Obtained from: Juniper Networks Reviewed by: so (des)
67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
/*-
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* Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
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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 __RANDOM_ADAPTORS_H__
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#define __RANDOM_ADAPTORS_H__
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#include <sys/eventhandler.h>
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struct random_adaptors {
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LIST_ENTRY(random_adaptors) entries; /* list of providers */
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const char *name; /* name of random adaptor */
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struct random_adaptor *rsp;
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};
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struct random_adaptor *random_adaptor_get(const char *);
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int random_adaptor_register(const char *, struct random_adaptor *);
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/*
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* random_adaptor's should be registered prior to
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* random module (SI_SUB_DRIVERS/SI_ORDER_MIDDLE)
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*/
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#define RANDOM_ADAPTOR_MODULE(name, modevent, ver) \
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static moduledata_t name##_mod = { \
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#name, \
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modevent, \
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0 \
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}; \
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DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, \
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SI_ORDER_SECOND); \
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MODULE_VERSION(name, ver); \
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MODULE_DEPEND(name, random, 1, 1, 1);
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typedef void (*random_adaptor_attach_hook)(void *, struct random_adaptor *);
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EVENTHANDLER_DECLARE(random_adaptor_attach, random_adaptor_attach_hook);
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/* kern.random sysctls */
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#ifdef SYSCTL_DECL /* from sysctl.h */
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SYSCTL_DECL(_kern_random);
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#endif /* SYSCTL_DECL */
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#endif /* __RANDOM_ADAPTORS_H__ */
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