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clockctl.c revision 1.28.12.1 
      1 /*      $NetBSD: clockctl.c,v 1.28.12.1 2012/04/17 00:07:25 yamt 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 1.28.12.1 2012/04/17 00:07:25 yamt 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 struct clockctl_softc {
     58 	struct device   clockctl_dev;
     59 };
     60 
     61 dev_type_ioctl(clockctlioctl);
     62 
     63 const struct cdevsw clockctl_cdevsw = {
     64 	nullopen, nullclose, noread, nowrite, clockctlioctl,
     65 	nostop, notty, nopoll, nommap, nokqfilter, D_OTHER,
     66 };
     67 
     68 static kauth_listener_t clockctl_listener;
     69 
     70 static int
     71 clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
     72     void *arg0, void *arg1, void *arg2, void *arg3)
     73 {
     74 	int result;
     75 	enum kauth_system_req req;
     76 	bool device_context;
     77 
     78 	result = KAUTH_RESULT_DEFER;
     79 	req = (enum kauth_system_req)arg0;
     80 
     81 	if ((action != KAUTH_SYSTEM_TIME) ||
     82 	    (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM))
     83 		return result;
     84 
     85 	device_context = (bool)arg3;
     86 
     87 	/* Device is controlled by permissions, so allow. */
     88 	if (device_context)
     89 		result = KAUTH_RESULT_ALLOW;
     90 
     91 	return result;
     92 }
     93 
     94 /*ARGSUSED*/
     95 void
     96 clockctlattach(int num)
     97 {
     98 
     99 	clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
    100 	    clockctl_listener_cb, NULL);
    101 }
    102 
    103 int
    104 clockctlioctl(
    105     dev_t dev,
    106     u_long cmd,
    107     void *data,
    108     int flags,
    109     struct lwp *l)
    110 {
    111 	int error = 0;
    112 
    113 	switch (cmd) {
    114 	case CLOCKCTL_SETTIMEOFDAY: {
    115 		struct clockctl_settimeofday *args = data;
    116 
    117 		error = settimeofday1(args->tv, true, args->tzp, l, false);
    118 		break;
    119 	}
    120 	case CLOCKCTL_ADJTIME: {
    121 		struct timeval atv, oldatv;
    122 		struct clockctl_adjtime *args = data;
    123 
    124 		if (args->delta) {
    125 			error = copyin(args->delta, &atv, sizeof(atv));
    126 			if (error)
    127 				return (error);
    128 		}
    129 		adjtime1(args->delta ? &atv : NULL,
    130 		    args->olddelta ? &oldatv : NULL, l->l_proc);
    131 		if (args->olddelta)
    132 			error = copyout(&oldatv, args->olddelta,
    133 			    sizeof(oldatv));
    134 		break;
    135 	}
    136 	case CLOCKCTL_CLOCK_SETTIME: {
    137 		struct clockctl_clock_settime *args = data;
    138 		struct timespec ts;
    139 
    140 		error = copyin(args->tp, &ts, sizeof ts);
    141 		if (error)
    142 			return (error);
    143 		error = clock_settime1(l->l_proc, args->clock_id, &ts, false);
    144 		break;
    145 	}
    146 #ifdef NTP
    147 	case CLOCKCTL_NTP_ADJTIME: {
    148 		struct clockctl_ntp_adjtime *args = data;
    149 		struct timex ntv;
    150 
    151 		error = copyin(args->tp, &ntv, sizeof(ntv));
    152 		if (error)
    153 			return (error);
    154 
    155 		ntp_adjtime1(&ntv);
    156 
    157 		error = copyout(&ntv, args->tp, sizeof(ntv));
    158 		if (error == 0)
    159 			args->retval = ntp_timestatus();
    160 		break;
    161 	}
    162 #endif /* NTP */
    163 	default:
    164 #ifdef COMPAT_50
    165 		error = compat50_clockctlioctl(dev, cmd, data, flags, l);
    166 #else
    167 		error = EINVAL;
    168 #endif
    169 	}
    170 
    171 	return (error);
    172 }
    173 
    174 
    175