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clockctl.c revision 1.31 
      1 /*      $NetBSD: clockctl.c,v 1.31 2014/03/16 05:20:26 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 1.31 2014/03/16 05:20:26 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_flag = D_OTHER,
     71 };
     72 
     73 static kauth_listener_t clockctl_listener;
     74 
     75 static int
     76 clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie,
     77     void *arg0, void *arg1, void *arg2, void *arg3)
     78 {
     79 	int result;
     80 	enum kauth_system_req req;
     81 	bool device_context;
     82 
     83 	result = KAUTH_RESULT_DEFER;
     84 	req = (enum kauth_system_req)arg0;
     85 
     86 	if ((action != KAUTH_SYSTEM_TIME) ||
     87 	    (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM))
     88 		return result;
     89 
     90 	device_context = (bool)arg3;
     91 
     92 	/* Device is controlled by permissions, so allow. */
     93 	if (device_context)
     94 		result = KAUTH_RESULT_ALLOW;
     95 
     96 	return result;
     97 }
     98 
     99 /*ARGSUSED*/
    100 void
    101 clockctlattach(int num)
    102 {
    103 
    104 	clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM,
    105 	    clockctl_listener_cb, NULL);
    106 }
    107 
    108 int
    109 clockctlioctl(
    110     dev_t dev,
    111     u_long cmd,
    112     void *data,
    113     int flags,
    114     struct lwp *l)
    115 {
    116 	int error = 0;
    117 
    118 	switch (cmd) {
    119 	case CLOCKCTL_SETTIMEOFDAY: {
    120 		struct clockctl_settimeofday *args = data;
    121 
    122 		error = settimeofday1(args->tv, true, args->tzp, l, false);
    123 		break;
    124 	}
    125 	case CLOCKCTL_ADJTIME: {
    126 		struct timeval atv, oldatv;
    127 		struct clockctl_adjtime *args = data;
    128 
    129 		if (args->delta) {
    130 			error = copyin(args->delta, &atv, sizeof(atv));
    131 			if (error)
    132 				return (error);
    133 		}
    134 		adjtime1(args->delta ? &atv : NULL,
    135 		    args->olddelta ? &oldatv : NULL, l->l_proc);
    136 		if (args->olddelta)
    137 			error = copyout(&oldatv, args->olddelta,
    138 			    sizeof(oldatv));
    139 		break;
    140 	}
    141 	case CLOCKCTL_CLOCK_SETTIME: {
    142 		struct clockctl_clock_settime *args = data;
    143 		struct timespec ts;
    144 
    145 		error = copyin(args->tp, &ts, sizeof ts);
    146 		if (error)
    147 			return (error);
    148 		error = clock_settime1(l->l_proc, args->clock_id, &ts, false);
    149 		break;
    150 	}
    151 #ifdef NTP
    152 	case CLOCKCTL_NTP_ADJTIME: {
    153 		struct clockctl_ntp_adjtime *args = data;
    154 		struct timex ntv;
    155 
    156 		error = copyin(args->tp, &ntv, sizeof(ntv));
    157 		if (error)
    158 			return (error);
    159 
    160 		ntp_adjtime1(&ntv);
    161 
    162 		error = copyout(&ntv, args->tp, sizeof(ntv));
    163 		if (error == 0)
    164 			args->retval = ntp_timestatus();
    165 		break;
    166 	}
    167 #endif /* NTP */
    168 	default:
    169 #ifdef COMPAT_50
    170 		error = compat50_clockctlioctl(dev, cmd, data, flags, l);
    171 #else
    172 		error = EINVAL;
    173 #endif
    174 	}
    175 
    176 	return (error);
    177 }
    178 
    179 
    180