Home | History | Annotate | Line # | Download | only in dev
clockctl.c revision 1.32 
      1 /*      $NetBSD: clockctl.c,v 1.32 2014/07/25 08:10:35 dholland Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Emmanuel Dreyfus.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: clockctl.c,v 1.32 2014/07/25 08:10:35 dholland Exp $");
     35 
     36 #include "opt_ntp.h"
     37 #include "opt_compat_netbsd.h"
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/proc.h>
     42 #include <sys/errno.h>
     43 #include <sys/ioctl.h>
     44 #include <sys/device.h>
     45 #include <sys/time.h>
     46 #include <sys/conf.h>
     47 #ifdef NTP
     48 #include <sys/timex.h>
     49 #endif /* NTP */
     50 #include <sys/kauth.h>
     51 
     52 #include <sys/clockctl.h>
     53 #ifdef COMPAT_50
     54 #include <compat/sys/clockctl.h>
     55 #endif
     56 
     57 dev_type_ioctl(clockctlioctl);
     58 
     59 const struct cdevsw clockctl_cdevsw = {
     60 	.d_open = nullopen,
     61 	.d_close = nullclose,
     62 	.d_read = noread,
     63 	.d_write = nowrite,
     64 	.d_ioctl = clockctlioctl,
     65 	.d_stop = nostop,
     66 	.d_tty = notty,
     67 	.d_poll = nopoll,
     68 	.d_mmap = nommap,
     69 	.d_kqfilter = nokqfilter,
     70 	.d_discard = nodiscard,
     71 	.d_flag = D_OTHER,
     72 };
     73 
     74 static kauth_listener_t clockctl_listener;
     75 
     76 static int
     77 clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
     78     void *arg0, void *arg1, void *arg2, void *arg3)
     79 {
     80 	int result;
     81 	enum kauth_system_req req;
     82 	bool device_context;
     83 
     84 	result = KAUTH_RESULT_DEFER;
     85 	req = (enum kauth_system_req)arg0;
     86 
     87 	if ((action != KAUTH_SYSTEM_TIME) ||
     88 	    (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM))
     89 		return result;
     90 
     91 	device_context = (bool)arg3;
     92 
     93 	/* Device is controlled by permissions, so allow. */
     94 	if (device_context)
     95 		result = KAUTH_RESULT_ALLOW;
     96 
     97 	return result;
     98 }
     99 
    100 /*ARGSUSED*/
    101 void
    102 clockctlattach(int num)
    103 {
    104 
    105 	clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
    106 	    clockctl_listener_cb, NULL);
    107 }
    108 
    109 int
    110 clockctlioctl(
    111     dev_t dev,
    112     u_long cmd,
    113     void *data,
    114     int flags,
    115     struct lwp *l)
    116 {
    117 	int error = 0;
    118 
    119 	switch (cmd) {
    120 	case CLOCKCTL_SETTIMEOFDAY: {
    121 		struct clockctl_settimeofday *args = data;
    122 
    123 		error = settimeofday1(args->tv, true, args->tzp, l, false);
    124 		break;
    125 	}
    126 	case CLOCKCTL_ADJTIME: {
    127 		struct timeval atv, oldatv;
    128 		struct clockctl_adjtime *args = data;
    129 
    130 		if (args->delta) {
    131 			error = copyin(args->delta, &atv, sizeof(atv));
    132 			if (error)
    133 				return (error);
    134 		}
    135 		adjtime1(args->delta ? &atv : NULL,
    136 		    args->olddelta ? &oldatv : NULL, l->l_proc);
    137 		if (args->olddelta)
    138 			error = copyout(&oldatv, args->olddelta,
    139 			    sizeof(oldatv));
    140 		break;
    141 	}
    142 	case CLOCKCTL_CLOCK_SETTIME: {
    143 		struct clockctl_clock_settime *args = data;
    144 		struct timespec ts;
    145 
    146 		error = copyin(args->tp, &ts, sizeof ts);
    147 		if (error)
    148 			return (error);
    149 		error = clock_settime1(l->l_proc, args->clock_id, &ts, false);
    150 		break;
    151 	}
    152 #ifdef NTP
    153 	case CLOCKCTL_NTP_ADJTIME: {
    154 		struct clockctl_ntp_adjtime *args = data;
    155 		struct timex ntv;
    156 
    157 		error = copyin(args->tp, &ntv, sizeof(ntv));
    158 		if (error)
    159 			return (error);
    160 
    161 		ntp_adjtime1(&ntv);
    162 
    163 		error = copyout(&ntv, args->tp, sizeof(ntv));
    164 		if (error == 0)
    165 			args->retval = ntp_timestatus();
    166 		break;
    167 	}
    168 #endif /* NTP */
    169 	default:
    170 #ifdef COMPAT_50
    171 		error = compat50_clockctlioctl(dev, cmd, data, flags, l);
    172 #else
    173 		error = EINVAL;
    174 #endif
    175 	}
    176 
    177 	return (error);
    178 }
    179 
    180 
    181