clockctl.c revision 1.35.6.2
1 /* $NetBSD: clockctl.c,v 1.35.6.2 2017/04/29 09:17:58 pgoyette 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 1.35.6.2 2017/04/29 09:17:58 pgoyette 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/localcount.h> 47 #include <sys/device.h> 48 #include <sys/time.h> 49 #include <sys/conf.h> 50 #ifdef NTP 51 #include <sys/timex.h> 52 #endif /* NTP */ 53 #include <sys/kauth.h> 54 #include <sys/module.h> 55 #include <sys/mutex.h> 56 57 #include <sys/clockctl.h> 58 #ifdef COMPAT_50 59 #include <compat/sys/clockctl.h> 60 #include <compat/sys/time_types.h> 61 #endif 62 63 kmutex_t clockctl_mtx; 64 int clockctl_refcnt; 65 66 #include "ioconf.h" 67 68 dev_type_ioctl(clockctlioctl); 69 70 const struct cdevsw clockctl_cdevsw = { 71 DEVSW_MODULE_INIT 72 .d_open = clockctlopen, 73 .d_close = clockctlclose, 74 .d_read = noread, 75 .d_write = nowrite, 76 .d_ioctl = clockctlioctl, 77 .d_stop = nostop, 78 .d_tty = notty, 79 .d_poll = nopoll, 80 .d_mmap = nommap, 81 .d_kqfilter = nokqfilter, 82 .d_discard = nodiscard, 83 .d_flag = D_OTHER, 84 }; 85 86 static kauth_listener_t clockctl_listener; 87 88 static int 89 clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 90 void *arg0, void *arg1, void *arg2, void *arg3) 91 { 92 int result; 93 enum kauth_system_req req; 94 bool device_context; 95 96 result = KAUTH_RESULT_DEFER; 97 req = (enum kauth_system_req)arg0; 98 99 if ((action != KAUTH_SYSTEM_TIME) || 100 (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM)) 101 return result; 102 103 device_context = (bool)arg3; 104 105 /* Device is controlled by permissions, so allow. */ 106 if (device_context) 107 result = KAUTH_RESULT_ALLOW; 108 109 return result; 110 } 111 112 /*ARGSUSED*/ 113 void 114 clockctlattach(int num) 115 { 116 117 /* 118 * Don't initialize the listener here - it will get handled as part 119 * of module initialization. 120 */ 121 #if 0 122 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 123 clockctl_listener_cb, NULL); 124 #endif 125 } 126 127 /* 128 * Maintain a refcount for each open/close, so we know when it is 129 * safe to call devsw_detach() 130 */ 131 int 132 clockctlopen(dev_t dev, int flag, int mode, struct lwp *l) 133 { 134 135 mutex_enter(&clockctl_mtx); 136 clockctl_refcnt++; 137 mutex_exit(&clockctl_mtx); 138 139 return 0; 140 } 141 142 int 143 clockctlclose(dev_t dev, int flag, int mode, struct lwp *l) 144 { 145 146 mutex_enter(&clockctl_mtx); 147 clockctl_refcnt--; 148 mutex_exit(&clockctl_mtx); 149 150 return 0; 151 } 152 153 MODULE(MODULE_CLASS_DRIVER, clockctl, NULL); 154 155 int 156 clockctl_modcmd(modcmd_t cmd, void *data) 157 { 158 int error; 159 #ifdef _MODULE 160 int bmajor, cmajor; 161 #endif 162 163 error = 0; 164 165 switch (cmd) { 166 case MODULE_CMD_INIT: 167 mutex_init(&clockctl_mtx, MUTEX_DEFAULT, IPL_NONE); 168 169 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 170 clockctl_listener_cb, NULL); 171 172 #ifdef _MODULE 173 bmajor = cmajor = -1; 174 error = devsw_attach("clockctl", NULL, &bmajor, 175 &clockctl_cdevsw, &cmajor); 176 if (error != 0) 177 kauth_unlisten_scope(clockctl_listener); 178 #endif 179 180 break; 181 182 case MODULE_CMD_FINI: 183 mutex_enter(&clockctl_mtx); 184 if (clockctl_refcnt != 0) { 185 mutex_exit(&clockctl_mtx); 186 return EBUSY; 187 } 188 #ifdef _MODULE 189 error = devsw_detach(NULL, &clockctl_cdevsw); 190 #endif 191 mutex_exit(&clockctl_mtx); 192 193 if (error == 0) { 194 kauth_unlisten_scope(clockctl_listener); 195 mutex_destroy(&clockctl_mtx); 196 } 197 break; 198 199 default: 200 error = ENOTTY; 201 break; 202 } 203 204 return error; 205 } 206 207 int 208 clockctlioctl( 209 dev_t dev, 210 u_long cmd, 211 void *data, 212 int flags, 213 struct lwp *l) 214 { 215 int error = 0; 216 217 switch (cmd) { 218 case CLOCKCTL_SETTIMEOFDAY: { 219 struct clockctl_settimeofday *args = data; 220 221 error = settimeofday1(args->tv, true, args->tzp, l, false); 222 break; 223 } 224 case CLOCKCTL_ADJTIME: { 225 struct timeval atv, oldatv; 226 struct clockctl_adjtime *args = data; 227 228 if (args->delta) { 229 error = copyin(args->delta, &atv, sizeof(atv)); 230 if (error) 231 return (error); 232 } 233 adjtime1(args->delta ? &atv : NULL, 234 args->olddelta ? &oldatv : NULL, l->l_proc); 235 if (args->olddelta) 236 error = copyout(&oldatv, args->olddelta, 237 sizeof(oldatv)); 238 break; 239 } 240 case CLOCKCTL_CLOCK_SETTIME: { 241 struct clockctl_clock_settime *args = data; 242 struct timespec ts; 243 244 error = copyin(args->tp, &ts, sizeof ts); 245 if (error) 246 return (error); 247 error = clock_settime1(l->l_proc, args->clock_id, &ts, false); 248 break; 249 } 250 #ifdef NTP 251 case CLOCKCTL_NTP_ADJTIME: { 252 struct clockctl_ntp_adjtime *args = data; 253 struct timex ntv; 254 255 error = copyin(args->tp, &ntv, sizeof(ntv)); 256 if (error) 257 return (error); 258 259 ntp_adjtime1(&ntv); 260 261 error = copyout(&ntv, args->tp, sizeof(ntv)); 262 if (error == 0) 263 args->retval = ntp_timestatus(); 264 break; 265 } 266 #endif /* NTP */ 267 default: 268 #ifdef COMPAT_50 269 error = compat50_clockctlioctl(dev, cmd, data, flags, l); 270 #else 271 error = ENOTTY; 272 #endif 273 } 274 275 return (error); 276 } 277 278 #ifdef COMPAT_50 279 int 280 compat50_clockctlioctl(dev_t dev, u_long cmd, void *data, int flags, 281 struct lwp *l) 282 { 283 int error = 0; 284 const struct cdevsw *cd = cdevsw_lookup_acquire(dev); 285 286 if (cd == NULL || cd->d_ioctl == NULL) { 287 if (cd != NULL) 288 cdevsw_release(cd); 289 return ENXIO; 290 } 291 292 switch (cmd) { 293 case CLOCKCTL_OSETTIMEOFDAY: { 294 struct timeval50 tv50; 295 struct timeval tv; 296 struct clockctl50_settimeofday *args = data; 297 298 error = copyin(args->tv, &tv50, sizeof(tv50)); 299 if (error) 300 break; 301 timeval50_to_timeval(&tv50, &tv); 302 error = settimeofday1(&tv, false, args->tzp, l, false); 303 break; 304 } 305 case CLOCKCTL_OADJTIME: { 306 struct timeval atv, oldatv; 307 struct timeval50 atv50; 308 struct clockctl50_adjtime *args = data; 309 310 if (args->delta) { 311 error = copyin(args->delta, &atv50, sizeof(atv50)); 312 if (error) 313 break; 314 timeval50_to_timeval(&atv50, &atv); 315 } 316 adjtime1(args->delta ? &atv : NULL, 317 args->olddelta ? &oldatv : NULL, l->l_proc); 318 if (args->olddelta) { 319 timeval_to_timeval50(&oldatv, &atv50); 320 error = copyout(&atv50, args->olddelta, sizeof(atv50)); 321 } 322 break; 323 } 324 case CLOCKCTL_OCLOCK_SETTIME: { 325 struct timespec50 tp50; 326 struct timespec tp; 327 struct clockctl50_clock_settime *args = data; 328 329 error = copyin(args->tp, &tp50, sizeof(tp50)); 330 if (error) 331 break; 332 timespec50_to_timespec(&tp50, &tp); 333 error = clock_settime1(l->l_proc, args->clock_id, &tp, true); 334 break; 335 } 336 #ifdef NTP 337 case CLOCKCTL_ONTP_ADJTIME: { 338 /* The ioctl number changed but the data did not change. */ 339 error = (cd->d_ioctl)(dev, CLOCKCTL_NTP_ADJTIME, 340 data, flags, l); 341 break; 342 } 343 #endif 344 default: 345 error = ENOTTY; 346 } 347 348 cdevsw_release(cd); 349 return (error); 350 } 351 #endif 352
Indexes created Thu Oct 02 10:09:58 GMT 2025