1 /*-
2 * Copyright (c) 1999 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: src/sys/compat/linux/linux_mib.c,v 1.7.2.2 2001/11/05 19:08:22 marcel Exp $
29 */
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/sysctl.h>
35 #include <sys/proc.h>
36 #include <sys/malloc.h>
37 #include <sys/jail.h>
38
39 #include <arch_linux/linux.h>
40 #include "linux_mib.h"
41
42 struct linux_prison {
43 char pr_osname[LINUX_MAX_UTSNAME];
44 char pr_osrelease[LINUX_MAX_UTSNAME];
45 int pr_oss_version;
46 };
47
48 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
49 "Linux mode");
50
51 static char linux_osname[LINUX_MAX_UTSNAME] = "Linux";
52
53 static int
54 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
55 {
56 char osname[LINUX_MAX_UTSNAME];
57 int error;
58
59 strcpy(osname, linux_get_osname(req->td));
60 error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
61 if (error || req->newptr == NULL)
62 return (error);
63 error = linux_set_osname(req->td, osname);
64 return (error);
65 }
66
67 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
68 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
69 0, 0, linux_sysctl_osname, "A",
70 "Linux kernel OS name");
71
72 static char linux_osrelease[LINUX_MAX_UTSNAME] = "2.6.16";
73
74 static int
75 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
76 {
77 char osrelease[LINUX_MAX_UTSNAME];
78 int error;
79
80 strcpy(osrelease, linux_get_osrelease(req->td));
81 error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
82 if (error || req->newptr == NULL)
83 return (error);
84 error = linux_set_osrelease(req->td, osrelease);
85 return (error);
86 }
87
88 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
89 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
90 0, 0, linux_sysctl_osrelease, "A",
91 "Linux kernel OS release");
92
93 static int linux_oss_version = 0x030600;
94
95 static int
96 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
97 {
98 int oss_version;
99 int error;
100
101 oss_version = linux_get_oss_version(req->td);
102 error = sysctl_handle_int(oidp, &oss_version, 0, req);
103 if (error || req->newptr == NULL)
104 return (error);
105 error = linux_set_oss_version(req->td, oss_version);
106 return (error);
107 }
108
109 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
110 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
111 0, 0, linux_sysctl_oss_version, "I",
112 "Linux OSS version");
113
114 static struct linux_prison *
115 get_prison(struct thread *td)
116 {
117 struct prison *pr;
118 struct linux_prison *lpr;
119
120 KKASSERT(td->td_proc);
121 pr = td->td_proc->p_ucred->cr_prison;
122 if (pr == NULL)
123 return (NULL);
124
125 if (pr->pr_linux == NULL) {
126 lpr = kmalloc(sizeof *lpr, M_PRISON, M_WAITOK | M_ZERO);
127 pr->pr_linux = lpr;
128 }
129
130 return (pr->pr_linux);
131 }
132
133 char *
134 linux_get_osname(struct thread *td)
135 {
136 struct prison *pr;
137 struct linux_prison *lpr;
138
139 KKASSERT(td->td_proc);
140 pr = td->td_proc->p_ucred->cr_prison;
141 if (pr != NULL && pr->pr_linux != NULL) {
142 lpr = pr->pr_linux;
143 if (lpr->pr_osname[0])
144 return (lpr->pr_osname);
145 }
146
147 return (linux_osname);
148 }
149
150 int
151 linux_set_osname(struct thread *td, char *osname)
152 {
153 struct linux_prison *lpr;
154
155 KKASSERT(td->td_proc);
156 lpr = get_prison(td);
157 if (lpr != NULL)
158 strcpy(lpr->pr_osname, osname);
159 else
160 strcpy(linux_osname, osname);
161
162 return (0);
163 }
164
165 char *
166 linux_get_osrelease(struct thread *td)
167 {
168 struct prison *pr;
169 struct linux_prison *lpr;
170
171 KKASSERT(td->td_proc);
172 pr = td->td_proc->p_ucred->cr_prison;
173 if (pr != NULL && pr->pr_linux != NULL) {
174 lpr = pr->pr_linux;
175 if (lpr->pr_osrelease[0])
176 return (lpr->pr_osrelease);
177 }
178
179 return (linux_osrelease);
180 }
181
182 int
183 linux_set_osrelease(struct thread *td, char *osrelease)
184 {
185 struct linux_prison *lpr;
186
187 lpr = get_prison(td);
188 if (lpr != NULL)
189 strcpy(lpr->pr_osrelease, osrelease);
190 else
191 strcpy(linux_osrelease, osrelease);
192
193 return (0);
194 }
195
196 int
197 linux_get_oss_version(struct thread *td)
198 {
199 struct prison *pr;
200 struct linux_prison *lpr;
201
202 KKASSERT(td->td_proc);
203 pr = td->td_proc->p_ucred->cr_prison;
204 if (pr != NULL && pr->pr_linux != NULL) {
205 lpr = pr->pr_linux;
206 if (lpr->pr_oss_version)
207 return (lpr->pr_oss_version);
208 }
209
210 return (linux_oss_version);
211 }
212
213 int
214 linux_set_oss_version(struct thread *td, int oss_version)
215 {
216 struct linux_prison *lpr;
217
218 lpr = get_prison(td);
219 if (lpr != NULL)
220 lpr->pr_oss_version = oss_version;
221 else
222 linux_oss_version = oss_version;
223
224 return (0);
225 }
226
227 #ifdef DEBUG
228
229 u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
230
231 static int
232 linux_debug(int syscall, int toggle, int global)
233 {
234
235 if (global) {
236 char c = toggle ? 0 : 0xff;
237
238 memset(linux_debug_map, c, sizeof(linux_debug_map));
239 return (0);
240 }
241 if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
242 return (EINVAL);
243 if (toggle)
244 clrbit(linux_debug_map, syscall);
245 else
246 setbit(linux_debug_map, syscall);
247 return (0);
248 }
249
250 /*
251 * Usage: sysctl -w linux.debug=<syscall_nr>.<0/1>
252 *
253 * E.g.: sysctl -w linux.debug=21.0
254 *
255 * As a special case, syscall "all" will apply to all syscalls globally.
256 */
257 #define LINUX_MAX_DEBUGSTR 16
258 static int
259 linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
260 {
261 char value[LINUX_MAX_DEBUGSTR], *p;
262 int error, sysc, toggle;
263 int global = 0;
264
265 value[0] = '\0';
266 error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
267 if (error || req->newptr == NULL)
268 return (error);
269 for (p = value; *p != '\0' && *p != '.'; p++);
270 if (*p == '\0')
271 return (EINVAL);
272 *p++ = '\0';
273 sysc = strtol(value, NULL, 0);
274 toggle = strtol(p, NULL, 0);
275 if (strcmp(value, "all") == 0)
276 global = 1;
277 error = linux_debug(sysc, toggle, global);
278 return (error);
279 }
280
281 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
282 CTLTYPE_STRING | CTLFLAG_RW,
283 0, 0, linux_sysctl_debug, "A",
284 "Linux debugging control");
285
286 #endif /* DEBUG */
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