FreeBSD-5.3/sys/compat/linux/linux_mib.c
/*-
* Copyright (c) 1999 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/compat/linux/linux_mib.c,v 1.22 2004/08/16 07:28:16 tjr Exp $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/jail.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include "opt_compat.h"
#if !COMPAT_LINUX32
#include <machine/../linux/linux.h>
#else
#include <machine/../linux32/linux.h>
#endif
#include <compat/linux/linux_mib.h>
struct linux_prison {
char pr_osname[LINUX_MAX_UTSNAME];
char pr_osrelease[LINUX_MAX_UTSNAME];
int pr_oss_version;
};
SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0,
"Linux mode");
static struct mtx osname_lock;
MTX_SYSINIT(linux_osname, &osname_lock, "linux osname", MTX_DEF);
static char linux_osname[LINUX_MAX_UTSNAME] = "Linux";
static int
linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
{
char osname[LINUX_MAX_UTSNAME];
int error;
linux_get_osname(req->td, osname);
error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
if (error || req->newptr == NULL)
return (error);
error = linux_set_osname(req->td, osname);
return (error);
}
SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
0, 0, linux_sysctl_osname, "A",
"Linux kernel OS name");
static char linux_osrelease[LINUX_MAX_UTSNAME] = "2.4.2";
static int
linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
{
char osrelease[LINUX_MAX_UTSNAME];
int error;
linux_get_osrelease(req->td, osrelease);
error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
if (error || req->newptr == NULL)
return (error);
error = linux_set_osrelease(req->td, osrelease);
return (error);
}
SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
0, 0, linux_sysctl_osrelease, "A",
"Linux kernel OS release");
static int linux_oss_version = 0x030600;
static int
linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
{
int oss_version;
int error;
oss_version = linux_get_oss_version(req->td);
error = sysctl_handle_int(oidp, &oss_version, 0, req);
if (error || req->newptr == NULL)
return (error);
error = linux_set_oss_version(req->td, oss_version);
return (error);
}
SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON,
0, 0, linux_sysctl_oss_version, "I",
"Linux OSS version");
/*
* Returns holding the prison mutex if return non-NULL.
*/
static struct prison *
linux_get_prison(struct thread *td)
{
register struct prison *pr;
register struct linux_prison *lpr;
KASSERT(td == curthread, ("linux_get_prison() called on !curthread"));
if (!jailed(td->td_ucred))
return (NULL);
pr = td->td_ucred->cr_prison;
mtx_lock(&pr->pr_mtx);
if (pr->pr_linux == NULL) {
/*
* If we don't have a linux prison structure yet, allocate
* one. We have to handle the race where another thread
* could be adding a linux prison to this process already.
*/
mtx_unlock(&pr->pr_mtx);
lpr = malloc(sizeof(struct linux_prison), M_PRISON,
M_WAITOK | M_ZERO);
mtx_lock(&pr->pr_mtx);
if (pr->pr_linux == NULL)
pr->pr_linux = lpr;
else
free(lpr, M_PRISON);
}
return (pr);
}
void
linux_mib_destroy(void)
{
mtx_destroy(&osname_lock);
}
void
linux_get_osname(struct thread *td, char *dst)
{
register struct prison *pr;
register struct linux_prison *lpr;
pr = td->td_ucred->cr_prison;
if (pr != NULL) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_linux != NULL) {
lpr = (struct linux_prison *)pr->pr_linux;
if (lpr->pr_osname[0]) {
bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
mtx_unlock(&pr->pr_mtx);
return;
}
}
mtx_unlock(&pr->pr_mtx);
}
mtx_lock(&osname_lock);
bcopy(linux_osname, dst, LINUX_MAX_UTSNAME);
mtx_unlock(&osname_lock);
}
int
linux_set_osname(struct thread *td, char *osname)
{
struct prison *pr;
struct linux_prison *lpr;
pr = linux_get_prison(td);
if (pr != NULL) {
lpr = (struct linux_prison *)pr->pr_linux;
strcpy(lpr->pr_osname, osname);
mtx_unlock(&pr->pr_mtx);
} else {
mtx_lock(&osname_lock);
strcpy(linux_osname, osname);
mtx_unlock(&osname_lock);
}
return (0);
}
void
linux_get_osrelease(struct thread *td, char *dst)
{
register struct prison *pr;
struct linux_prison *lpr;
pr = td->td_ucred->cr_prison;
if (pr != NULL) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_linux != NULL) {
lpr = (struct linux_prison *)pr->pr_linux;
if (lpr->pr_osrelease[0]) {
bcopy(lpr->pr_osrelease, dst,
LINUX_MAX_UTSNAME);
mtx_unlock(&pr->pr_mtx);
return;
}
}
mtx_unlock(&pr->pr_mtx);
}
mtx_lock(&osname_lock);
bcopy(linux_osrelease, dst, LINUX_MAX_UTSNAME);
mtx_unlock(&osname_lock);
}
int
linux_set_osrelease(struct thread *td, char *osrelease)
{
struct prison *pr;
struct linux_prison *lpr;
pr = linux_get_prison(td);
if (pr != NULL) {
lpr = (struct linux_prison *)pr->pr_linux;
strcpy(lpr->pr_osrelease, osrelease);
mtx_unlock(&pr->pr_mtx);
} else {
mtx_lock(&osname_lock);
strcpy(linux_osrelease, osrelease);
mtx_unlock(&osname_lock);
}
return (0);
}
int
linux_get_oss_version(struct thread *td)
{
register struct prison *pr;
register struct linux_prison *lpr;
int version;
pr = td->td_ucred->cr_prison;
if (pr != NULL) {
mtx_lock(&pr->pr_mtx);
if (pr->pr_linux != NULL) {
lpr = (struct linux_prison *)pr->pr_linux;
if (lpr->pr_oss_version) {
version = lpr->pr_oss_version;
mtx_unlock(&pr->pr_mtx);
return (version);
}
}
mtx_unlock(&pr->pr_mtx);
}
mtx_lock(&osname_lock);
version = linux_oss_version;
mtx_unlock(&osname_lock);
return (version);
}
int
linux_set_oss_version(struct thread *td, int oss_version)
{
struct prison *pr;
struct linux_prison *lpr;
pr = linux_get_prison(td);
if (pr != NULL) {
lpr = (struct linux_prison *)pr->pr_linux;
lpr->pr_oss_version = oss_version;
mtx_unlock(&pr->pr_mtx);
} else {
mtx_lock(&osname_lock);
linux_oss_version = oss_version;
mtx_unlock(&osname_lock);
}
return (0);
}
#ifdef DEBUG
u_char linux_debug_map[howmany(LINUX_SYS_MAXSYSCALL, sizeof(u_char))];
static int
linux_debug(int syscall, int toggle, int global)
{
if (global) {
char c = toggle ? 0 : 0xff;
memset(linux_debug_map, c, sizeof(linux_debug_map));
return (0);
}
if (syscall < 0 || syscall >= LINUX_SYS_MAXSYSCALL)
return (EINVAL);
if (toggle)
clrbit(linux_debug_map, syscall);
else
setbit(linux_debug_map, syscall);
return (0);
}
/*
* Usage: sysctl linux.debug=<syscall_nr>.<0/1>
*
* E.g.: sysctl linux.debug=21.0
*
* As a special case, syscall "all" will apply to all syscalls globally.
*/
#define LINUX_MAX_DEBUGSTR 16
static int
linux_sysctl_debug(SYSCTL_HANDLER_ARGS)
{
char value[LINUX_MAX_DEBUGSTR], *p;
int error, sysc, toggle;
int global = 0;
value[0] = '\0';
error = sysctl_handle_string(oidp, value, LINUX_MAX_DEBUGSTR, req);
if (error || req->newptr == NULL)
return (error);
for (p = value; *p != '\0' && *p != '.'; p++);
if (*p == '\0')
return (EINVAL);
*p++ = '\0';
sysc = strtol(value, NULL, 0);
toggle = strtol(p, NULL, 0);
if (strcmp(value, "all") == 0)
global = 1;
error = linux_debug(sysc, toggle, global);
return (error);
}
SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
CTLTYPE_STRING | CTLFLAG_RW,
0, 0, linux_sysctl_debug, "A",
"Linux debugging control");
#endif /* DEBUG */