1 | /* $NetBSD: linux_sysctl.c,v 1.43 2014/05/16 12:22:32 martin Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2003, 2008 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Andrew Brown. |
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 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | /* |
33 | * sysctl system call. |
34 | */ |
35 | |
36 | #include <sys/cdefs.h> |
37 | __KERNEL_RCSID(0, "$NetBSD: linux_sysctl.c,v 1.43 2014/05/16 12:22:32 martin Exp $" ); |
38 | |
39 | #include <sys/param.h> |
40 | #include <sys/systm.h> |
41 | #include <sys/errno.h> |
42 | #include <sys/proc.h> |
43 | #include <sys/mount.h> |
44 | #include <sys/sysctl.h> |
45 | #include <sys/sched.h> |
46 | #include <sys/syscallargs.h> |
47 | #include <sys/ktrace.h> |
48 | |
49 | #include <compat/linux/common/linux_types.h> |
50 | #include <compat/linux/common/linux_signal.h> |
51 | #include <compat/linux/common/linux_ipc.h> |
52 | #include <compat/linux/common/linux_sem.h> |
53 | |
54 | #include <compat/linux/linux_syscallargs.h> |
55 | #include <compat/linux/common/linux_sysctl.h> |
56 | #include <compat/linux/common/linux_exec.h> |
57 | #include <compat/linux/common/linux_machdep.h> |
58 | |
59 | char linux_sysname[128] = "Linux" ; |
60 | char linux_release[128] = "3.11.6" ; |
61 | char linux_version[128] = "#1 SMP PREEMPT Thu Oct 24 16:23:02 UTC 2013" ; |
62 | |
63 | struct sysctlnode linux_sysctl_root = { |
64 | .sysctl_flags = SYSCTL_VERSION| |
65 | CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE, |
66 | .sysctl_num = 0, |
67 | .sysctl_name = "(linux_root)" , |
68 | .sysctl_size = sizeof(struct sysctlnode), |
69 | }; |
70 | |
71 | static struct sysctllog *linux_clog1; |
72 | static struct sysctllog *linux_clog2; |
73 | |
74 | void |
75 | linux_sysctl_fini(void) |
76 | { |
77 | |
78 | sysctl_teardown(&linux_clog2); |
79 | sysctl_teardown(&linux_clog1); |
80 | sysctl_free(&linux_sysctl_root); |
81 | } |
82 | |
83 | void |
84 | linux_sysctl_init(void) |
85 | { |
86 | const struct sysctlnode *node = &linux_sysctl_root; |
87 | |
88 | sysctl_createv(&linux_clog1, 0, &node, &node, |
89 | CTLFLAG_PERMANENT, |
90 | CTLTYPE_NODE, "kern" , NULL, |
91 | NULL, 0, NULL, 0, |
92 | LINUX_CTL_KERN, CTL_EOL); |
93 | sysctl_createv(&linux_clog1, 0, &node, NULL, |
94 | CTLFLAG_PERMANENT, |
95 | CTLTYPE_STRING, "ostype" , NULL, |
96 | NULL, 0, linux_sysname, sizeof(linux_sysname), |
97 | LINUX_KERN_OSTYPE, CTL_EOL); |
98 | sysctl_createv(&linux_clog1, 0, &node, NULL, |
99 | CTLFLAG_PERMANENT, |
100 | CTLTYPE_STRING, "osrelease" , NULL, |
101 | NULL, 0, linux_release, sizeof(linux_release), |
102 | LINUX_KERN_OSRELEASE, CTL_EOL); |
103 | sysctl_createv(&linux_clog1, 0, &node, NULL, |
104 | CTLFLAG_PERMANENT, |
105 | CTLTYPE_STRING, "version" , NULL, |
106 | NULL, 0, linux_version, sizeof(linux_version), |
107 | LINUX_KERN_VERSION, CTL_EOL); |
108 | |
109 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
110 | CTLFLAG_PERMANENT, |
111 | CTLTYPE_NODE, "linux" , |
112 | SYSCTL_DESCR("Linux emulation settings" ), |
113 | NULL, 0, NULL, 0, |
114 | CTL_EMUL, EMUL_LINUX, CTL_EOL); |
115 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
116 | CTLFLAG_PERMANENT, |
117 | CTLTYPE_NODE, "kern" , |
118 | SYSCTL_DESCR("Linux kernel emulation settings" ), |
119 | NULL, 0, NULL, 0, |
120 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, CTL_EOL); |
121 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
122 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
123 | CTLTYPE_STRING, "ostype" , |
124 | SYSCTL_DESCR("Linux operating system type" ), |
125 | NULL, 0, linux_sysname, sizeof(linux_sysname), |
126 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, |
127 | EMUL_LINUX_KERN_OSTYPE, CTL_EOL); |
128 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
129 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
130 | CTLTYPE_STRING, "osrelease" , |
131 | SYSCTL_DESCR("Linux operating system release" ), |
132 | NULL, 0, linux_release, sizeof(linux_release), |
133 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, |
134 | EMUL_LINUX_KERN_OSRELEASE, CTL_EOL); |
135 | sysctl_createv(&linux_clog2, 0, NULL, NULL, |
136 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
137 | CTLTYPE_STRING, "osversion" , |
138 | SYSCTL_DESCR("Linux operating system revision" ), |
139 | NULL, 0, linux_version, sizeof(linux_version), |
140 | CTL_EMUL, EMUL_LINUX, EMUL_LINUX_KERN, |
141 | EMUL_LINUX_KERN_VERSION, CTL_EOL); |
142 | |
143 | linux_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE; |
144 | } |
145 | |
146 | /* |
147 | * linux sysctl system call |
148 | */ |
149 | int |
150 | linux_sys___sysctl(struct lwp *l, const struct linux_sys___sysctl_args *uap, register_t *retval) |
151 | { |
152 | struct linux___sysctl ls; |
153 | int error, nerror, name[CTL_MAXNAME]; |
154 | size_t savelen = 0, oldlen = 0; |
155 | |
156 | /* |
157 | * get linux args structure |
158 | */ |
159 | if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls)))) |
160 | return error; |
161 | |
162 | /* |
163 | * get oldlen |
164 | */ |
165 | oldlen = 0; |
166 | if (ls.oldlenp != NULL) { |
167 | error = copyin(ls.oldlenp, &oldlen, sizeof(oldlen)); |
168 | if (error) |
169 | return (error); |
170 | } |
171 | savelen = oldlen; |
172 | |
173 | /* |
174 | * top-level sysctl names may or may not be non-terminal, but |
175 | * we don't care |
176 | */ |
177 | if (ls.nlen > CTL_MAXNAME || ls.nlen < 1) |
178 | return (ENOTDIR); |
179 | error = copyin(ls.name, &name, ls.nlen * sizeof(int)); |
180 | if (error) |
181 | return (error); |
182 | |
183 | ktrmib(name, ls.nlen); |
184 | |
185 | /* |
186 | * dispatch request into linux sysctl tree |
187 | */ |
188 | sysctl_lock(ls.newval != NULL); |
189 | error = sysctl_dispatch(&name[0], ls.nlen, |
190 | ls.oldval, &oldlen, |
191 | ls.newval, ls.newlen, |
192 | &name[0], l, &linux_sysctl_root); |
193 | sysctl_unlock(); |
194 | |
195 | /* |
196 | * reset caller's oldlen, even if we got an error |
197 | */ |
198 | if (ls.oldlenp) { |
199 | nerror = copyout(&oldlen, ls.oldlenp, sizeof(oldlen)); |
200 | if (error == 0) |
201 | error = nerror; |
202 | } |
203 | |
204 | /* |
205 | * if the only problem is that we weren't given enough space, |
206 | * that's an ENOMEM error |
207 | */ |
208 | if (error == 0 && ls.oldval != NULL && savelen < oldlen) |
209 | error = ENOMEM; |
210 | |
211 | return (error); |
212 | } |
213 | |