clockctl.c revision 1.34
1 /* $NetBSD: clockctl.c,v 1.34 2016/01/06 18:06:38 christos 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 1.34 2016/01/06 18:06:38 christos Exp $"); 35 36 #ifdef _KERNEL_OPT 37 #include "opt_ntp.h" 38 #include "opt_compat_netbsd.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/proc.h> 44 #include <sys/errno.h> 45 #include <sys/ioctl.h> 46 #include <sys/device.h> 47 #include <sys/time.h> 48 #include <sys/conf.h> 49 #ifdef NTP 50 #include <sys/timex.h> 51 #endif /* NTP */ 52 #include <sys/kauth.h> 53 #include <sys/module.h> 54 #include <sys/mutex.h> 55 56 #include <sys/clockctl.h> 57 #ifdef COMPAT_50 58 #include <compat/sys/clockctl.h> 59 #include <compat/sys/time_types.h> 60 #endif 61 62 kmutex_t clockctl_mtx; 63 int clockctl_refcnt; 64 65 #include "ioconf.h" 66 67 dev_type_ioctl(clockctlioctl); 68 69 const struct cdevsw clockctl_cdevsw = { 70 .d_open = clockctlopen, 71 .d_close = clockctlclose, 72 .d_read = noread, 73 .d_write = nowrite, 74 .d_ioctl = clockctlioctl, 75 .d_stop = nostop, 76 .d_tty = notty, 77 .d_poll = nopoll, 78 .d_mmap = nommap, 79 .d_kqfilter = nokqfilter, 80 .d_discard = nodiscard, 81 .d_flag = D_OTHER, 82 }; 83 84 static kauth_listener_t clockctl_listener; 85 86 static int 87 clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 88 void *arg0, void *arg1, void *arg2, void *arg3) 89 { 90 int result; 91 enum kauth_system_req req; 92 bool device_context; 93 94 result = KAUTH_RESULT_DEFER; 95 req = (enum kauth_system_req)arg0; 96 97 if ((action != KAUTH_SYSTEM_TIME) || 98 (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM)) 99 return result; 100 101 device_context = (bool)arg3; 102 103 /* Device is controlled by permissions, so allow. */ 104 if (device_context) 105 result = KAUTH_RESULT_ALLOW; 106 107 return result; 108 } 109 110 /*ARGSUSED*/ 111 void 112 clockctlattach(int num) 113 { 114 115 /* 116 * Don't initialize the listener here - it will get handled as part 117 * of module initialization. 118 */ 119 #if 0 120 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 121 clockctl_listener_cb, NULL); 122 #endif 123 } 124 125 /* 126 * Maintain a refcount for each open/close, so we know when it is 127 * safe to call devsw_detach() 128 */ 129 int 130 clockctlopen(dev_t dev, int flag, int mode, struct lwp *l) 131 { 132 133 mutex_enter(&clockctl_mtx); 134 clockctl_refcnt++; 135 mutex_exit(&clockctl_mtx); 136 137 return 0; 138 } 139 140 int 141 clockctlclose(dev_t dev, int flag, int mode, struct lwp *l) 142 { 143 144 mutex_enter(&clockctl_mtx); 145 clockctl_refcnt--; 146 mutex_exit(&clockctl_mtx); 147 148 return 0; 149 } 150 151 MODULE(MODULE_CLASS_DRIVER, clockctl, NULL); 152 153 int 154 clockctl_modcmd(modcmd_t cmd, void *data) 155 { 156 int error; 157 #ifdef _MODULE 158 int bmajor, cmajor; 159 #endif 160 161 error = 0; 162 163 switch (cmd) { 164 case MODULE_CMD_INIT: 165 mutex_init(&clockctl_mtx, MUTEX_DEFAULT, IPL_NONE); 166 167 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 168 clockctl_listener_cb, NULL); 169 170 #ifdef _MODULE 171 bmajor = cmajor = -1; 172 error = devsw_attach("clockctl", NULL, &bmajor, 173 &clockctl_cdevsw, &cmajor); 174 if (error != 0) 175 kauth_unlisten_scope(clockctl_listener); 176 #endif 177 178 break; 179 180 case MODULE_CMD_FINI: 181 mutex_enter(&clockctl_mtx); 182 if (clockctl_refcnt != 0) { 183 mutex_exit(&clockctl_mtx); 184 return EBUSY; 185 } 186 #ifdef _MODULE 187 error = devsw_detach(NULL, &clockctl_cdevsw); 188 #endif 189 mutex_exit(&clockctl_mtx); 190 191 if (error == 0) { 192 kauth_unlisten_scope(clockctl_listener); 193 mutex_destroy(&clockctl_mtx); 194 } 195 break; 196 197 default: 198 error = ENOTTY; 199 break; 200 } 201 202 return error; 203 } 204 205 int 206 clockctlioctl( 207 dev_t dev, 208 u_long cmd, 209 void *data, 210 int flags, 211 struct lwp *l) 212 { 213 int error = 0; 214 215 switch (cmd) { 216 case CLOCKCTL_SETTIMEOFDAY: { 217 struct clockctl_settimeofday *args = data; 218 219 error = settimeofday1(args->tv, true, args->tzp, l, false); 220 break; 221 } 222 case CLOCKCTL_ADJTIME: { 223 struct timeval atv, oldatv; 224 struct clockctl_adjtime *args = data; 225 226 if (args->delta) { 227 error = copyin(args->delta, &atv, sizeof(atv)); 228 if (error) 229 return (error); 230 } 231 adjtime1(args->delta ? &atv : NULL, 232 args->olddelta ? &oldatv : NULL, l->l_proc); 233 if (args->olddelta) 234 error = copyout(&oldatv, args->olddelta, 235 sizeof(oldatv)); 236 break; 237 } 238 case CLOCKCTL_CLOCK_SETTIME: { 239 struct clockctl_clock_settime *args = data; 240 struct timespec ts; 241 242 error = copyin(args->tp, &ts, sizeof ts); 243 if (error) 244 return (error); 245 error = clock_settime1(l->l_proc, args->clock_id, &ts, false); 246 break; 247 } 248 #ifdef NTP 249 case CLOCKCTL_NTP_ADJTIME: { 250 struct clockctl_ntp_adjtime *args = data; 251 struct timex ntv; 252 253 error = copyin(args->tp, &ntv, sizeof(ntv)); 254 if (error) 255 return (error); 256 257 ntp_adjtime1(&ntv); 258 259 error = copyout(&ntv, args->tp, sizeof(ntv)); 260 if (error == 0) 261 args->retval = ntp_timestatus(); 262 break; 263 } 264 #endif /* NTP */ 265 default: 266 #ifdef COMPAT_50 267 error = compat50_clockctlioctl(dev, cmd, data, flags, l); 268 #else 269 error = EINVAL; 270 #endif 271 } 272 273 return (error); 274 } 275 276 #ifdef COMPAT_50 277 int 278 compat50_clockctlioctl(dev_t dev, u_long cmd, void *data, int flags, 279 struct lwp *l) 280 { 281 int error = 0; 282 const struct cdevsw *cd = cdevsw_lookup(dev); 283 284 if (cd == NULL || cd->d_ioctl == NULL) 285 return ENXIO; 286 287 switch (cmd) { 288 case CLOCKCTL_OSETTIMEOFDAY: { 289 struct timeval50 tv50; 290 struct timeval tv; 291 struct clockctl50_settimeofday *args = data; 292 293 error = copyin(args->tv, &tv50, sizeof(tv50)); 294 if (error) 295 return (error); 296 timeval50_to_timeval(&tv50, &tv); 297 error = settimeofday1(&tv, false, args->tzp, l, false); 298 break; 299 } 300 case CLOCKCTL_OADJTIME: { 301 struct timeval atv, oldatv; 302 struct timeval50 atv50; 303 struct clockctl50_adjtime *args = data; 304 305 if (args->delta) { 306 error = copyin(args->delta, &atv50, sizeof(atv50)); 307 if (error) 308 return (error); 309 timeval50_to_timeval(&atv50, &atv); 310 } 311 adjtime1(args->delta ? &atv : NULL, 312 args->olddelta ? &oldatv : NULL, l->l_proc); 313 if (args->olddelta) { 314 timeval_to_timeval50(&oldatv, &atv50); 315 error = copyout(&atv50, args->olddelta, sizeof(atv50)); 316 } 317 break; 318 } 319 case CLOCKCTL_OCLOCK_SETTIME: { 320 struct timespec50 tp50; 321 struct timespec tp; 322 struct clockctl50_clock_settime *args = data; 323 324 error = copyin(args->tp, &tp50, sizeof(tp50)); 325 if (error) 326 return (error); 327 timespec50_to_timespec(&tp50, &tp); 328 error = clock_settime1(l->l_proc, args->clock_id, &tp, true); 329 break; 330 } 331 case CLOCKCTL_ONTP_ADJTIME: 332 /* The ioctl number changed but the data did not change. */ 333 error = (cd->d_ioctl)(dev, CLOCKCTL_NTP_ADJTIME, 334 data, flags, l); 335 break; 336 default: 337 error = EINVAL; 338 } 339 340 return (error); 341 } 342 #endif 343
Indexes created Sun Sep 28 07:09:56 GMT 2025