clockctl.c revision 1.35.6.3
1 /* $NetBSD: clockctl.c,v 1.35.6.3 2017/04/29 10:19:31 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 1.35.6.3 2017/04/29 10:19:31 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/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 DEVSW_MODULE_INIT 71 .d_open = clockctlopen, 72 .d_close = clockctlclose, 73 .d_read = noread, 74 .d_write = nowrite, 75 .d_ioctl = clockctlioctl, 76 .d_stop = nostop, 77 .d_tty = notty, 78 .d_poll = nopoll, 79 .d_mmap = nommap, 80 .d_kqfilter = nokqfilter, 81 .d_discard = nodiscard, 82 .d_flag = D_OTHER, 83 }; 84 85 static kauth_listener_t clockctl_listener; 86 87 static int 88 clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 89 void *arg0, void *arg1, void *arg2, void *arg3) 90 { 91 int result; 92 enum kauth_system_req req; 93 bool device_context; 94 95 result = KAUTH_RESULT_DEFER; 96 req = (enum kauth_system_req)arg0; 97 98 if ((action != KAUTH_SYSTEM_TIME) || 99 (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM)) 100 return result; 101 102 device_context = (bool)arg3; 103 104 /* Device is controlled by permissions, so allow. */ 105 if (device_context) 106 result = KAUTH_RESULT_ALLOW; 107 108 return result; 109 } 110 111 /*ARGSUSED*/ 112 void 113 clockctlattach(int num) 114 { 115 116 /* 117 * Don't initialize the listener here - it will get handled as part 118 * of module initialization. 119 */ 120 #if 0 121 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 122 clockctl_listener_cb, NULL); 123 #endif 124 } 125 126 /* 127 * Maintain a refcount for each open/close, so we know when it is 128 * safe to call devsw_detach() 129 */ 130 int 131 clockctlopen(dev_t dev, int flag, int mode, struct lwp *l) 132 { 133 134 mutex_enter(&clockctl_mtx); 135 clockctl_refcnt++; 136 mutex_exit(&clockctl_mtx); 137 138 return 0; 139 } 140 141 int 142 clockctlclose(dev_t dev, int flag, int mode, struct lwp *l) 143 { 144 145 mutex_enter(&clockctl_mtx); 146 clockctl_refcnt--; 147 mutex_exit(&clockctl_mtx); 148 149 return 0; 150 } 151 152 MODULE(MODULE_CLASS_DRIVER, clockctl, NULL); 153 154 int 155 clockctl_modcmd(modcmd_t cmd, void *data) 156 { 157 int error; 158 #ifdef _MODULE 159 int bmajor, cmajor; 160 #endif 161 162 error = 0; 163 164 switch (cmd) { 165 case MODULE_CMD_INIT: 166 mutex_init(&clockctl_mtx, MUTEX_DEFAULT, IPL_NONE); 167 168 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, 169 clockctl_listener_cb, NULL); 170 171 #ifdef _MODULE 172 bmajor = cmajor = -1; 173 error = devsw_attach("clockctl", NULL, &bmajor, 174 &clockctl_cdevsw, &cmajor); 175 if (error != 0) 176 kauth_unlisten_scope(clockctl_listener); 177 #endif 178 179 break; 180 181 case MODULE_CMD_FINI: 182 mutex_enter(&clockctl_mtx); 183 if (clockctl_refcnt != 0) { 184 mutex_exit(&clockctl_mtx); 185 return EBUSY; 186 } 187 #ifdef _MODULE 188 error = devsw_detach(NULL, &clockctl_cdevsw); 189 #endif 190 mutex_exit(&clockctl_mtx); 191 192 if (error == 0) { 193 kauth_unlisten_scope(clockctl_listener); 194 mutex_destroy(&clockctl_mtx); 195 } 196 break; 197 198 default: 199 error = ENOTTY; 200 break; 201 } 202 203 return error; 204 } 205 206 int 207 clockctlioctl( 208 dev_t dev, 209 u_long cmd, 210 void *data, 211 int flags, 212 struct lwp *l) 213 { 214 int error = 0; 215 216 switch (cmd) { 217 case CLOCKCTL_SETTIMEOFDAY: { 218 struct clockctl_settimeofday *args = data; 219 220 error = settimeofday1(args->tv, true, args->tzp, l, false); 221 break; 222 } 223 case CLOCKCTL_ADJTIME: { 224 struct timeval atv, oldatv; 225 struct clockctl_adjtime *args = data; 226 227 if (args->delta) { 228 error = copyin(args->delta, &atv, sizeof(atv)); 229 if (error) 230 return (error); 231 } 232 adjtime1(args->delta ? &atv : NULL, 233 args->olddelta ? &oldatv : NULL, l->l_proc); 234 if (args->olddelta) 235 error = copyout(&oldatv, args->olddelta, 236 sizeof(oldatv)); 237 break; 238 } 239 case CLOCKCTL_CLOCK_SETTIME: { 240 struct clockctl_clock_settime *args = data; 241 struct timespec ts; 242 243 error = copyin(args->tp, &ts, sizeof ts); 244 if (error) 245 return (error); 246 error = clock_settime1(l->l_proc, args->clock_id, &ts, false); 247 break; 248 } 249 #ifdef NTP 250 case CLOCKCTL_NTP_ADJTIME: { 251 struct clockctl_ntp_adjtime *args = data; 252 struct timex ntv; 253 254 error = copyin(args->tp, &ntv, sizeof(ntv)); 255 if (error) 256 return (error); 257 258 ntp_adjtime1(&ntv); 259 260 error = copyout(&ntv, args->tp, sizeof(ntv)); 261 if (error == 0) 262 args->retval = ntp_timestatus(); 263 break; 264 } 265 #endif /* NTP */ 266 default: 267 #ifdef COMPAT_50 268 error = compat50_clockctlioctl(dev, cmd, data, flags, l); 269 #else 270 error = ENOTTY; 271 #endif 272 } 273 274 return (error); 275 } 276 277 #ifdef COMPAT_50 278 int 279 compat50_clockctlioctl(dev_t dev, u_long cmd, void *data, int flags, 280 struct lwp *l) 281 { 282 int error = 0; 283 const struct cdevsw *cd = cdevsw_lookup_acquire(dev); 284 285 if (cd == NULL || cd->d_ioctl == NULL) { 286 if (cd != NULL) 287 cdevsw_release(cd); 288 return ENXIO; 289 } 290 291 switch (cmd) { 292 case CLOCKCTL_OSETTIMEOFDAY: { 293 struct timeval50 tv50; 294 struct timeval tv; 295 struct clockctl50_settimeofday *args = data; 296 297 error = copyin(args->tv, &tv50, sizeof(tv50)); 298 if (error) 299 break; 300 timeval50_to_timeval(&tv50, &tv); 301 error = settimeofday1(&tv, false, args->tzp, l, false); 302 break; 303 } 304 case CLOCKCTL_OADJTIME: { 305 struct timeval atv, oldatv; 306 struct timeval50 atv50; 307 struct clockctl50_adjtime *args = data; 308 309 if (args->delta) { 310 error = copyin(args->delta, &atv50, sizeof(atv50)); 311 if (error) 312 break; 313 timeval50_to_timeval(&atv50, &atv); 314 } 315 adjtime1(args->delta ? &atv : NULL, 316 args->olddelta ? &oldatv : NULL, l->l_proc); 317 if (args->olddelta) { 318 timeval_to_timeval50(&oldatv, &atv50); 319 error = copyout(&atv50, args->olddelta, sizeof(atv50)); 320 } 321 break; 322 } 323 case CLOCKCTL_OCLOCK_SETTIME: { 324 struct timespec50 tp50; 325 struct timespec tp; 326 struct clockctl50_clock_settime *args = data; 327 328 error = copyin(args->tp, &tp50, sizeof(tp50)); 329 if (error) 330 break; 331 timespec50_to_timespec(&tp50, &tp); 332 error = clock_settime1(l->l_proc, args->clock_id, &tp, true); 333 break; 334 } 335 #ifdef NTP 336 case CLOCKCTL_ONTP_ADJTIME: { 337 /* The ioctl number changed but the data did not change. */ 338 error = (cd->d_ioctl)(dev, CLOCKCTL_NTP_ADJTIME, 339 data, flags, l); 340 break; 341 } 342 #endif 343 default: 344 error = ENOTTY; 345 } 346 347 cdevsw_release(cd); 348 return (error); 349 } 350 #endif 351
Indexes created Thu Oct 02 10:09:58 GMT 2025