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14636c3b51
of entropy harvesting they wish to perform: "ethernet" (LAN), point-to-point and interrupt.
261 lines
7.3 KiB
C
261 lines
7.3 KiB
C
/*-
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* Copyright (c) 2000 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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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/poll.h>
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#include <sys/selinfo.h>
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#include <sys/random.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <crypto/blowfish/blowfish.h>
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#include <dev/random/hash.h>
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#include <dev/random/yarrow.h>
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static d_open_t random_open;
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static d_close_t random_close;
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static d_read_t random_read;
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static d_write_t random_write;
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static d_ioctl_t random_ioctl;
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static d_poll_t random_poll;
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#define CDEV_MAJOR 2
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#define RANDOM_MINOR 3
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#define URANDOM_MINOR 4
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static struct cdevsw random_cdevsw = {
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/* open */ random_open,
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/* close */ random_close,
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/* read */ random_read,
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/* write */ random_write,
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/* ioctl */ random_ioctl,
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/* poll */ random_poll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "random",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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/* bmaj */ -1
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};
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/* For use with make_dev(9)/destroy_dev(9). */
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static dev_t random_dev;
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static dev_t urandom_dev; /* XXX Temporary */
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/* To stash the sysctl's until they are removed */
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static struct sysctl_oid *random_sysctl[12]; /* magic # is sysctl count */
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static int sysctlcount = 0;
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static int
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random_open(dev_t dev, int flags, int fmt, struct proc *p)
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{
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if ((flags & FWRITE) && (securelevel > 0 || suser(p)))
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return EPERM;
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else
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return 0;
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}
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static int
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random_close(dev_t dev, int flags, int fmt, struct proc *p)
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{
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if ((flags & FWRITE) && !(securelevel > 0 || suser(p)))
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random_reseed();
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return 0;
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}
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static int
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random_read(dev_t dev, struct uio *uio, int flag)
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{
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u_int c, ret;
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int error = 0;
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void *random_buf;
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while (!random_state.seeded) {
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if (flag & IO_NDELAY)
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error = EWOULDBLOCK;
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else
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error = tsleep(&random_state, PUSER|PCATCH, "rndblk", 0);
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if (error != 0)
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return error;
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}
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c = min(uio->uio_resid, PAGE_SIZE);
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random_buf = (void *)malloc(c, M_TEMP, M_WAITOK);
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while (uio->uio_resid > 0 && error == 0) {
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ret = read_random_real(random_buf, c);
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error = uiomove(random_buf, ret, uio);
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}
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free(random_buf, M_TEMP);
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return error;
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}
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static int
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random_write(dev_t dev, struct uio *uio, int flag)
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{
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u_int c;
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int error = 0;
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void *random_buf;
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random_buf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
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while (uio->uio_resid > 0) {
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c = min(uio->uio_resid, PAGE_SIZE);
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error = uiomove(random_buf, c, uio);
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if (error)
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break;
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write_random(random_buf, c);
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}
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free(random_buf, M_TEMP);
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return error;
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}
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static int
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random_ioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
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{
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return ENOTTY;
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}
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static int
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random_poll(dev_t dev, int events, struct proc *p)
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{
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int revents;
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revents = 0;
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if (events & (POLLIN | POLLRDNORM)) {
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if (random_state.seeded)
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revents = events & (POLLIN | POLLRDNORM);
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else
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selrecord(p, &random_state.rsel);
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}
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return revents;
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}
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static int
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random_modevent(module_t mod, int type, void *data)
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{
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struct sysctl_oid *node_base, *node1, *node2;
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int error, i;
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switch(type) {
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case MOD_LOAD:
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error = random_init();
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if (error != 0)
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return error;
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random_sysctl[sysctlcount++] = node_base =
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SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_kern),
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OID_AUTO, "random", CTLFLAG_RW, 0,
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"Random Number Generator");
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random_sysctl[sysctlcount++] = node1 =
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SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(node_base),
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OID_AUTO, "sys", CTLFLAG_RW, 0,
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"Entropy Device Parameters");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node1),
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OID_AUTO, "seeded", CTLFLAG_RW,
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&random_state.seeded, 0, "Seeded State");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node1),
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OID_AUTO, "harvest_ethernet", CTLFLAG_RW,
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&harvest.ethernet, 0, "Harvest NIC entropy");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node1),
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OID_AUTO, "harvest_point_to_point", CTLFLAG_RW,
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&harvest.point_to_point, 0, "Harvest serial net entropy");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node1),
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OID_AUTO, "harvest_interrupt", CTLFLAG_RW,
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&harvest.interrupt, 0, "Harvest IRQ entropy");
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random_sysctl[sysctlcount++] = node2 =
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SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(node_base),
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OID_AUTO, "yarrow", CTLFLAG_RW, 0,
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"Yarrow Parameters");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node2),
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OID_AUTO, "gengateinterval", CTLFLAG_RW,
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&random_state.gengateinterval, 0,
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"Generator Gate Interval");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node2),
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OID_AUTO, "bins", CTLFLAG_RW,
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&random_state.bins, 0,
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"Execution time tuner");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node2),
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OID_AUTO, "fastthresh", CTLFLAG_RW,
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&random_state.pool[0].thresh, 0,
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"Fast pool reseed threshhold");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node2),
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OID_AUTO, "slowthresh", CTLFLAG_RW,
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&random_state.pool[1].thresh, 0,
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"Slow pool reseed threshhold");
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random_sysctl[sysctlcount++] =
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SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(node2),
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OID_AUTO, "slowoverthresh", CTLFLAG_RW,
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&random_state.slowoverthresh, 0,
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"Slow pool over-threshhold reseed");
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if (bootverbose)
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printf("random: <entropy source>\n");
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random_dev = make_dev(&random_cdevsw, RANDOM_MINOR, UID_ROOT,
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GID_WHEEL, 0666, "random");
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urandom_dev = make_dev(&random_cdevsw, URANDOM_MINOR, UID_ROOT,
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GID_WHEEL, 0666, "urandom"); /* XXX Temporary */
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return 0;
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case MOD_UNLOAD:
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random_deinit();
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destroy_dev(random_dev);
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destroy_dev(urandom_dev); /* XXX Temporary */
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for (i = sysctlcount - 1; i >= 0; i--)
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if (sysctl_remove_oid(random_sysctl[i], 1, 0) == EINVAL)
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panic("random: removing sysctl");
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return 0;
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case MOD_SHUTDOWN:
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return 0;
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default:
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return EOPNOTSUPP;
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}
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}
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DEV_MODULE(random, random_modevent, NULL);
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