1 /*-
2 * Copyright (c) 2001 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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/10.3/sys/compat/linux/linux_sysctl.c 293532 2016-01-09 16:20:29Z dchagin $");
31
32 #include "opt_compat.h"
33 #include "opt_kdtrace.h"
34
35 #include <sys/param.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/malloc.h>
39 #include <sys/mutex.h>
40 #include <sys/proc.h>
41 #include <sys/sdt.h>
42 #include <sys/sysctl.h>
43 #include <sys/systm.h>
44 #include <sys/sbuf.h>
45
46 #ifdef COMPAT_LINUX32
47 #include <machine/../linux32/linux.h>
48 #include <machine/../linux32/linux32_proto.h>
49 #else
50 #include <machine/../linux/linux.h>
51 #include <machine/../linux/linux_proto.h>
52 #endif
53
54 #include <compat/linux/linux_dtrace.h>
55 #include <compat/linux/linux_misc.h>
56 #include <compat/linux/linux_util.h>
57
58 #define LINUX_CTL_KERN 1
59 #define LINUX_CTL_VM 2
60 #define LINUX_CTL_NET 3
61 #define LINUX_CTL_PROC 4
62 #define LINUX_CTL_FS 5
63 #define LINUX_CTL_DEBUG 6
64 #define LINUX_CTL_DEV 7
65 #define LINUX_CTL_BUS 8
66
67 /* CTL_KERN names */
68 #define LINUX_KERN_OSTYPE 1
69 #define LINUX_KERN_OSRELEASE 2
70 #define LINUX_KERN_OSREV 3
71 #define LINUX_KERN_VERSION 4
72
73 /* DTrace init */
74 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
75
76 /**
77 * DTrace probes in this module.
78 */
79 LIN_SDT_PROBE_DEFINE2(sysctl, handle_string, entry, "struct l___sysctl_args *",
80 "char *");
81 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int");
82 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, return, "int");
83 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, entry, "struct l___sysctl_args *",
84 "struct thread *");
85 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int");
86 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int");
87 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *");
88 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, return, "int");
89
90 static int
91 handle_string(struct l___sysctl_args *la, char *value)
92 {
93 int error;
94
95 LIN_SDT_PROBE2(sysctl, handle_string, entry, la, value);
96
97 if (la->oldval != 0) {
98 l_int len = strlen(value);
99 error = copyout(value, PTRIN(la->oldval), len + 1);
100 if (!error && la->oldlenp != 0)
101 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len));
102 if (error) {
103 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error,
104 error);
105 LIN_SDT_PROBE1(sysctl, handle_string, return, error);
106 return (error);
107 }
108 }
109
110 if (la->newval != 0) {
111 LIN_SDT_PROBE1(sysctl, handle_string, return, ENOTDIR);
112 return (ENOTDIR);
113 }
114
115 LIN_SDT_PROBE1(sysctl, handle_string, return, 0);
116 return (0);
117 }
118
119 int
120 linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
121 {
122 struct l___sysctl_args la;
123 struct sbuf *sb;
124 l_int *mib;
125 char *sysctl_string;
126 int error, i;
127
128 LIN_SDT_PROBE2(sysctl, linux_sysctl, entry, td, args->args);
129
130 error = copyin(args->args, &la, sizeof(la));
131 if (error) {
132 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
133 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
134 return (error);
135 }
136
137 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) {
138 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen,
139 LINUX_CTL_MAXNAME);
140 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR);
141 return (ENOTDIR);
142 }
143
144 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK);
145 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int));
146 if (error) {
147 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
148 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
149 free(mib, M_LINUX);
150 return (error);
151 }
152
153 switch (mib[0]) {
154 case LINUX_CTL_KERN:
155 if (la.nlen < 2)
156 break;
157
158 switch (mib[1]) {
159 case LINUX_KERN_VERSION:
160 error = handle_string(&la, version);
161 free(mib, M_LINUX);
162 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
163 return (error);
164 default:
165 break;
166 }
167 break;
168 default:
169 break;
170 }
171
172 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
173 if (sb == NULL) {
174 linux_msg(td, "sysctl is not implemented");
175 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
176 "unknown sysctl, ENOMEM during lookup");
177 } else {
178 sbuf_printf(sb, "sysctl ");
179 for (i = 0; i < la.nlen; i++)
180 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
181 sbuf_printf(sb, "} is not implemented");
182 sbuf_finish(sb);
183 sysctl_string = sbuf_data(sb);
184 linux_msg(td, "%s", sbuf_data(sb));
185 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
186 sysctl_string);
187 sbuf_delete(sb);
188 }
189
190 free(mib, M_LINUX);
191
192 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR);
193 return (ENOTDIR);
194 }
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