/* $NetBSD: clockctl.c,v 1.39 2022/03/28 12:33:20 riastradh Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Emmanuel Dreyfus. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: clockctl.c,v 1.39 2022/03/28 12:33:20 riastradh Exp $"); #ifdef _KERNEL_OPT #include "opt_ntp.h" #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include kmutex_t clockctl_mtx; int clockctl_refcnt; #include "ioconf.h" dev_type_ioctl(clockctlioctl); const struct cdevsw clockctl_cdevsw = { .d_open = clockctlopen, .d_close = clockctlclose, .d_read = noread, .d_write = nowrite, .d_ioctl = clockctlioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = D_OTHER, }; static kauth_listener_t clockctl_listener; static int clockctl_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, void *arg0, void *arg1, void *arg2, void *arg3) { int result; enum kauth_system_req req; bool device_context; result = KAUTH_RESULT_DEFER; req = (enum kauth_system_req)(uintptr_t)arg0; if ((action != KAUTH_SYSTEM_TIME) || (req != KAUTH_REQ_SYSTEM_TIME_SYSTEM)) return result; device_context = arg3 != NULL; /* Device is controlled by permissions, so allow. */ if (device_context) result = KAUTH_RESULT_ALLOW; return result; } /*ARGSUSED*/ void clockctlattach(int num) { /* * Don't initialize the listener here - it will get handled as part * of module initialization. */ #if 0 clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, clockctl_listener_cb, NULL); #endif } /* * Maintain a refcount for each open/close, so we know when it is * safe to call devsw_detach() */ int clockctlopen(dev_t dev, int flag, int mode, struct lwp *l) { mutex_enter(&clockctl_mtx); clockctl_refcnt++; mutex_exit(&clockctl_mtx); return 0; } int clockctlclose(dev_t dev, int flag, int mode, struct lwp *l) { mutex_enter(&clockctl_mtx); clockctl_refcnt--; mutex_exit(&clockctl_mtx); return 0; } MODULE(MODULE_CLASS_DRIVER, clockctl, NULL); int clockctl_modcmd(modcmd_t cmd, void *data) { int error; #ifdef _MODULE int bmajor, cmajor; #endif error = 0; switch (cmd) { case MODULE_CMD_INIT: mutex_init(&clockctl_mtx, MUTEX_DEFAULT, IPL_NONE); clockctl_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, clockctl_listener_cb, NULL); #ifdef _MODULE bmajor = cmajor = -1; error = devsw_attach("clockctl", NULL, &bmajor, &clockctl_cdevsw, &cmajor); if (error != 0) kauth_unlisten_scope(clockctl_listener); #endif break; case MODULE_CMD_FINI: mutex_enter(&clockctl_mtx); if (clockctl_refcnt != 0) { mutex_exit(&clockctl_mtx); return EBUSY; } #ifdef _MODULE devsw_detach(NULL, &clockctl_cdevsw); #endif mutex_exit(&clockctl_mtx); kauth_unlisten_scope(clockctl_listener); mutex_destroy(&clockctl_mtx); break; default: error = ENOTTY; break; } return error; } int clockctlioctl( dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) { int error = 0; switch (cmd) { case CLOCKCTL_SETTIMEOFDAY: { struct clockctl_settimeofday *args = data; error = settimeofday1(args->tv, true, args->tzp, l, false); break; } case CLOCKCTL_ADJTIME: { struct timeval atv, oldatv; struct clockctl_adjtime *args = data; if (args->delta) { error = copyin(args->delta, &atv, sizeof(atv)); if (error) return (error); } adjtime1(args->delta ? &atv : NULL, args->olddelta ? &oldatv : NULL, l->l_proc); if (args->olddelta) error = copyout(&oldatv, args->olddelta, sizeof(oldatv)); break; } case CLOCKCTL_CLOCK_SETTIME: { struct clockctl_clock_settime *args = data; struct timespec ts; error = copyin(args->tp, &ts, sizeof ts); if (error) return (error); error = clock_settime1(l->l_proc, args->clock_id, &ts, false); break; } case CLOCKCTL_NTP_ADJTIME: { struct clockctl_ntp_adjtime *args = data; struct timex ntv; if (vec_ntp_timestatus == NULL) { error = ENOTTY; break; } error = copyin(args->tp, &ntv, sizeof(ntv)); if (error) return (error); (*vec_ntp_adjtime1)(&ntv); error = copyout(&ntv, args->tp, sizeof(ntv)); if (error == 0) args->retval = (*vec_ntp_timestatus)(); break; } default: MODULE_HOOK_CALL(clockctl_ioctl_50_hook, (dev, cmd, data, flags, l), enosys(), error); if (error == ENOSYS) error = ENOTTY; } return (error); }