linux_sysctl.c revision 156874 
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: head/sys/compat/linux/linux_sysctl.c 156874 2006-03-19 11:10:33Z ru $");
31
32#include "opt_compat.h"
33
34#include <sys/param.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>
37#include <sys/mutex.h>
38#include <sys/proc.h>
39#include <sys/sysctl.h>
40#include <sys/systm.h>
41#include <sys/sbuf.h>
42
43#ifdef COMPAT_LINUX32
44#include <machine/../linux32/linux.h>
45#include <machine/../linux32/linux32_proto.h>
46#else
47#include <machine/../linux/linux.h>
48#include <machine/../linux/linux_proto.h>
49#endif
50
51#include <compat/linux/linux_util.h>
52
53#define	LINUX_CTL_KERN		1
54#define	LINUX_CTL_VM		2
55#define	LINUX_CTL_NET		3
56#define	LINUX_CTL_PROC		4
57#define	LINUX_CTL_FS		5
58#define	LINUX_CTL_DEBUG		6
59#define	LINUX_CTL_DEV		7
60#define	LINUX_CTL_BUS		8
61
62/* CTL_KERN names */
63#define	LINUX_KERN_OSTYPE	1
64#define	LINUX_KERN_OSRELEASE	2
65#define	LINUX_KERN_OSREV	3
66#define	LINUX_KERN_VERSION	4
67
68static int
69handle_string(struct l___sysctl_args *la, char *value)
70{
71	int error;
72
73	if (la->oldval != 0) {
74		l_int len = strlen(value);
75		error = copyout(value, PTRIN(la->oldval), len + 1);
76		if (!error && la->oldlenp != 0)
77			error = copyout(&len, PTRIN(la->oldlenp), sizeof(len));
78		if (error)
79			return (error);
80	}
81
82	if (la->newval != 0)
83		return (ENOTDIR);
84
85	return (0);
86}
87
88int
89linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
90{
91	struct l___sysctl_args la;
92	struct sbuf *sb;
93	l_int *mib;
94	int error, i;
95
96	error = copyin(args->args, &la, sizeof(la));
97	if (error)
98		return (error);
99
100	if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME)
101		return (ENOTDIR);
102
103	mib = malloc(la.nlen * sizeof(l_int), M_TEMP, M_WAITOK);
104	error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int));
105	if (error) {
106		free(mib, M_TEMP);
107		return (error);
108	}
109
110	switch (mib[0]) {
111	case LINUX_CTL_KERN:
112		if (la.nlen < 2)
113			break;
114
115		switch (mib[1]) {
116		case LINUX_KERN_VERSION:
117			error = handle_string(&la, version);
118			free(mib, M_TEMP);
119			return (error);
120		default:
121			break;
122		}
123		break;
124	default:
125		break;
126	}
127
128	sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
129	if (sb == NULL) {
130		linux_msg(td, "sysctl is not implemented");
131	} else {
132		sbuf_printf(sb, "sysctl ");
133		for (i = 0; i < la.nlen; i++)
134			sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
135		sbuf_printf(sb, "} is not implemented");
136		sbuf_finish(sb);
137		linux_msg(td, "%s", sbuf_data(sb));
138		sbuf_delete(sb);
139	}
140
141	free(mib, M_TEMP);
142	return (ENOTDIR);
143}
144