NetBSD/sys/dev/clockctl.c

171 lines
4.4 KiB
C

/* $NetBSD: clockctl.c,v 1.30 2012/10/27 17:18:14 chs Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Emmanuel Dreyfus.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: clockctl.c,v 1.30 2012/10/27 17:18:14 chs Exp $");
#include "opt_ntp.h"
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/time.h>
#include <sys/conf.h>
#ifdef NTP
#include <sys/timex.h>
#endif /* NTP */
#include <sys/kauth.h>
#include <sys/clockctl.h>
#ifdef COMPAT_50
#include <compat/sys/clockctl.h>
#endif
dev_type_ioctl(clockctlioctl);
const struct cdevsw clockctl_cdevsw = {
nullopen, nullclose, noread, nowrite, clockctlioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_OTHER,
};
static kauth_listener_t clockctl_listener;
static int
clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
void *arg0, void *arg1, void *arg2, void *arg3)
{
int result;
enum kauth_system_req req;
bool device_context;
result = KAUTH_RESULT_DEFER;
req = (enum kauth_system_req)arg0;
if ((action != KAUTH_SYSTEM_TIME) ||
(req != KAUTH_REQ_SYSTEM_TIME_SYSTEM))
return result;
device_context = (bool)arg3;
/* Device is controlled by permissions, so allow. */
if (device_context)
result = KAUTH_RESULT_ALLOW;
return result;
}
/*ARGSUSED*/
void
clockctlattach(int num)
{
clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
clockctl_listener_cb, NULL);
}
int
clockctlioctl(
dev_t dev,
u_long cmd,
void *data,
int flags,
struct lwp *l)
{
int error = 0;
switch (cmd) {
case CLOCKCTL_SETTIMEOFDAY: {
struct clockctl_settimeofday *args = data;
error = settimeofday1(args->tv, true, args->tzp, l, false);
break;
}
case CLOCKCTL_ADJTIME: {
struct timeval atv, oldatv;
struct clockctl_adjtime *args = data;
if (args->delta) {
error = copyin(args->delta, &atv, sizeof(atv));
if (error)
return (error);
}
adjtime1(args->delta ? &atv : NULL,
args->olddelta ? &oldatv : NULL, l->l_proc);
if (args->olddelta)
error = copyout(&oldatv, args->olddelta,
sizeof(oldatv));
break;
}
case CLOCKCTL_CLOCK_SETTIME: {
struct clockctl_clock_settime *args = data;
struct timespec ts;
error = copyin(args->tp, &ts, sizeof ts);
if (error)
return (error);
error = clock_settime1(l->l_proc, args->clock_id, &ts, false);
break;
}
#ifdef NTP
case CLOCKCTL_NTP_ADJTIME: {
struct clockctl_ntp_adjtime *args = data;
struct timex ntv;
error = copyin(args->tp, &ntv, sizeof(ntv));
if (error)
return (error);
ntp_adjtime1(&ntv);
error = copyout(&ntv, args->tp, sizeof(ntv));
if (error == 0)
args->retval = ntp_timestatus();
break;
}
#endif /* NTP */
default:
#ifdef COMPAT_50
error = compat50_clockctlioctl(dev, cmd, data, flags, l);
#else
error = EINVAL;
#endif
}
return (error);
}