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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)
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*-
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* Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
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* Copyright (c) 2013 David E. O'Brien <obrien@NUXI.org>
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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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#include <sys/param.h>
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__FBSDID("$FreeBSD$");
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/selinfo.h>
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#include <sys/sysctl.h>
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#include <sys/sx.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/libkern.h>
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#include <dev/random/random_adaptors.h>
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#include <dev/random/randomdev.h>
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LIST_HEAD(adaptors_head, random_adaptors);
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static struct adaptors_head adaptors = LIST_HEAD_INITIALIZER(adaptors);
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static struct sx adaptors_lock; /* need a sleepable lock */
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/* List for the dynamic sysctls */
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static struct sysctl_ctx_list random_clist;
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MALLOC_DEFINE(M_RANDOM_ADAPTORS, "random_adaptors", "Random adaptors buffers");
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int
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random_adaptor_register(const char *name, struct random_adaptor *rsp)
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{
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struct random_adaptors *rpp;
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KASSERT(name != NULL && rsp != NULL, ("invalid input to %s", __func__));
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rpp = malloc(sizeof(struct random_adaptors), M_RANDOM_ADAPTORS, M_WAITOK);
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rpp->name = name;
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rpp->rsp = rsp;
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sx_xlock(&adaptors_lock);
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LIST_INSERT_HEAD(&adaptors, rpp, entries);
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sx_xunlock(&adaptors_lock);
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return (0);
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}
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struct random_adaptor *
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random_adaptor_get(const char *name)
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{
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struct random_adaptors *rpp;
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struct random_adaptor *rsp;
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rsp = NULL;
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sx_slock(&adaptors_lock);
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LIST_FOREACH(rpp, &adaptors, entries)
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if (strcmp(rpp->name, name) == 0)
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rsp = rpp->rsp;
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sx_sunlock(&adaptors_lock);
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return (rsp);
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}
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static void
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random_adaptors_deinit(void *unused)
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{
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sx_destroy(&adaptors_lock);
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sysctl_ctx_free(&random_clist);
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}
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static int
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random_sysctl_adaptors_handler(SYSCTL_HANDLER_ARGS)
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{
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struct random_adaptors *rpp;
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int error;
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error = 0;
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sx_slock(&adaptors_lock);
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if (LIST_EMPTY(&adaptors))
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error = SYSCTL_OUT(req, "", strlen(""));
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LIST_FOREACH(rpp, &adaptors, entries) {
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if (0 != SYSCTL_OUT(req, rpp->name, strlen(rpp->name)))
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break;
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}
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sx_sunlock(&adaptors_lock);
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return (error);
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}
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static void
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random_adaptors_init(void *unused)
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{
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SYSCTL_PROC(_kern_random, OID_AUTO, adaptors,
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
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NULL, 0, random_sysctl_adaptors_handler, "",
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"Random Number Generator adaptors");
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sx_init(&adaptors_lock, "random_adaptors");
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}
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SYSCTL_NODE(_kern, OID_AUTO, random, CTLFLAG_RW, 0, "Random Number Generator");
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SYSINIT(random_adaptors, SI_SUB_DRIVERS, SI_ORDER_FIRST, random_adaptors_init,
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NULL);
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SYSUNINIT(random_adaptors, SI_SUB_DRIVERS, SI_ORDER_FIRST,
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random_adaptors_deinit, NULL);
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