1 | /* $NetBSD: clockctl.c,v 1.35 2016/11/21 03:53:59 rin 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 2016/11/21 03:53:59 rin 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 = ENOTTY; |
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 | #ifdef NTP |
332 | case CLOCKCTL_ONTP_ADJTIME: { |
333 | /* The ioctl number changed but the data did not change. */ |
334 | error = (cd->d_ioctl)(dev, CLOCKCTL_NTP_ADJTIME, |
335 | data, flags, l); |
336 | break; |
337 | } |
338 | #endif |
339 | default: |
340 | error = ENOTTY; |
341 | } |
342 | |
343 | return (error); |
344 | } |
345 | #endif |
346 | |