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/* $OpenBSD: xfs_syscalls.c,v 1.3 1998/08/31 05:13:17 art Exp $ */
/*
* Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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/types.h>
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/namei.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/syscall.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <xfs/xfs_common.h>
RCSID("$KTH: xfs_syscalls.c,v 1.20 1998/07/19 21:18:30 art Exp $");
/*
* XFS system calls.
*/
#include <xfs/xfs_message.h>
#include <xfs/xfs_syscalls.h>
#include <xfs/xfs_dev.h>
#include <xfs/xfs_node.h>
#include <xfs/xfs_deb.h>
/* Misc syscalls */
#include <xfs/xfs_pioctl.h>
#include <sys/syscallargs.h>
#ifdef ACTUALLY_LKM_NOT_KERNEL
/* XXX really defined in kern/kern_lkm.c */
extern int sys_lkmnosys(struct proc *p, void *v, register_t *retval);
#ifndef SYS_MAXSYSCALL /* Workaround for OpenBSD */
#define SYS_MAXSYSCALL 255
#endif
#endif /* ACTUALLY_LKM_NOT_KERNEL */
/*
* Def pag:
* 33536 <= g0 <= 34560
* 32512 <= g1 <= 48896
*/
#define XFS_PAG1_LLIM 33536
#define XFS_PAG1_ULIM 34560
#define XFS_PAG2_LLIM 32512
#define XFS_PAG2_ULIM 48896
static gid_t pag_part_one = XFS_PAG1_LLIM;
static gid_t pag_part_two = XFS_PAG2_LLIM;
static int
xfs_is_pag(struct ucred *cred)
{
/* The first group is the gid of the user ? */
if (cred->cr_ngroups >= 3 &&
cred->cr_groups[1] >= XFS_PAG1_LLIM &&
cred->cr_groups[1] <= XFS_PAG1_ULIM &&
cred->cr_groups[2] >= XFS_PAG2_LLIM &&
cred->cr_groups[2] <= XFS_PAG2_ULIM)
return 1;
else
return 0;
}
pag_t
xfs_get_pag(struct ucred *cred)
{
if (xfs_is_pag(cred)) {
return (((cred->cr_groups[1] << 16) & 0xFFFF0000) |
((cred->cr_groups[2] & 0x0000FFFF)));
} else
return cred->cr_uid; /* XXX */
}
static int
xfs_setpag_call(struct ucred **ret_cred)
{
struct ucred *cred = *ret_cred;
int i;
if (!xfs_is_pag(cred)) {
/* Check if it fits */
if (cred->cr_ngroups + 2 >= NGROUPS)
return E2BIG; /* XXX Hmmm, better error ? */
cred = crcopy (cred);
/* Copy the groups */
for (i = cred->cr_ngroups - 1; i > 0; i--) {
cred->cr_groups[i + 2] = cred->cr_groups[i];
}
cred->cr_ngroups += 2;
} else
cred = crcopy(cred);
cred->cr_groups[1] = pag_part_one;
cred->cr_groups[2] = pag_part_two++;
if (pag_part_two > XFS_PAG2_ULIM) {
pag_part_one++;
pag_part_two = XFS_PAG2_LLIM;
}
*ret_cred = cred;
return 0;
}
#ifdef ACTUALLY_LKM_NOT_KERNEL
#if defined(__NetBSD__) || defined(__OpenBSD__)
#define syscallarg(x) union { x datum; register_t pad; }
struct sys_xfspioctl_args {
syscallarg(int) operation;
syscallarg(char *) a_pathP;
syscallarg(int) a_opcode;
syscallarg(struct ViceIoctl *) a_paramsP;
syscallarg(int) a_followSymlinks;
};
#elif defined(__FreeBSD__)
struct sys_xfspioctl_args {
int operation;
char *a_pathP;
int a_opcode;
struct ViceIoctl *a_paramsP;
int a_followSymlinks;
};
#ifndef SCARG
#define SCARG(a, b) (a->b)
#endif
#endif
#endif /* ACTUALLY_LKM_NOT_KERNEL */
static int
xfs_pioctl_call(struct proc *p, void *v, int *i)
{
int error;
struct ViceIoctl vice_ioctl;
struct xfs_message_pioctl msg;
struct xfs_message_wakeup_data *msg2;
char *pathptr;
struct sys_xfspioctl_args *arg = (struct sys_xfspioctl_args *) v;
/* Copy in the data structure for us */
error = copyin(SCARG(arg, a_paramsP),
&vice_ioctl,
sizeof(vice_ioctl));
if (error)
return error;
if (vice_ioctl.in_size > 2048) {
printf("xfs_pioctl_call: got a humongous inpacket: opcode: %d",
SCARG(arg, a_opcode));
return EINVAL;
}
if (vice_ioctl.in_size != 0) {
error = copyin(vice_ioctl.in,
&msg.msg,
vice_ioctl.in_size);
if (error)
return error;
}
pathptr = SCARG(arg, a_pathP);
if (pathptr != NULL) {
char path[MAXPATHLEN];
struct xfs_node *xn;
struct nameidata nd;
struct vnode *vp;
size_t done;
XFSDEB(XDEBSYS, ("xfs_syscall: looking up: %p\n", pathptr));
error = copyinstr(pathptr, path, sizeof(path) - 1, &done);
path[sizeof(path) - 1] = '\0';
XFSDEB(XDEBSYS, ("xfs_syscall: path: %s len: %d error: %d\n",
path, done, error));
if (error)
return error;
NDINIT(&nd, LOOKUP,
SCARG(arg, a_followSymlinks) ? FOLLOW : 0,
UIO_SYSSPACE, path, p);
error = namei(&nd);
if (error != 0) {
XFSDEB(XDEBSYS, ("xfs_syscall: error in namei: %d\n",
error));
return EINVAL;
}
vp = nd.ni_vp;
if (vp->v_tag != VT_AFS) {
XFSDEB(XDEBSYS, ("xfs_syscall: %s not in afs\n",
path));
vrele(vp);
return EINVAL;
}
xn = VNODE_TO_XNODE(vp);
msg.handle = xn->handle;
vrele(vp);
}
msg.header.opcode = XFS_MSG_PIOCTL;
msg.opcode = SCARG(arg, a_opcode);
msg.insize = vice_ioctl.in_size;
msg.outsize = vice_ioctl.out_size;
msg.cred.uid = p->p_cred->p_ruid;
msg.cred.pag = xfs_get_pag(p->p_ucred);
error = xfs_message_rpc(0, &msg.header, sizeof(msg)); /* XXX */
msg2 = (struct xfs_message_wakeup_data *) &msg;
if (error == 0)
error = msg2->error;
else
error = EINVAL; /* return EINVAL to not confuse applications */
if (error == 0 && msg2->header.opcode == XFS_MSG_WAKEUP_DATA)
error = copyout(msg2->msg, vice_ioctl.out,
min(msg2->len, vice_ioctl.out_size));
return error;
}
#ifdef ACTUALLY_LKM_NOT_KERNEL
static int
xfs_syscall(struct proc *p, void *v, int *i)
#else
int
sys_xfspioctl(struct proc *p, void *v, int *i)
#endif
{
struct sys_xfspioctl_args *arg = (struct sys_xfspioctl_args *) v;
int error = EINVAL;
switch (SCARG(arg, operation)) {
case AFSCALL_PIOCTL:
error = xfs_pioctl_call(p, v, i);
break;
case AFSCALL_SETPAG:
error = xfs_setpag_call(&p->p_cred->pc_ucred);
break;
default:
uprintf("Unimplemeted call: %d\n", SCARG(arg, operation));
error = EINVAL;
break;
}
return error;
}
#ifdef ACTUALLY_LKM_NOT_KERNEL
#if defined(__NetBSD__) || defined(__OpenBSD__)
static int syscall_offset;
static struct sysent syscall_oldent;
static struct sysent xfs_syscallent = {
4, /* number of args */
sizeof(struct sys_xfspioctl_args), /* size of args */
xfs_syscall /* function pointer */
};
static int
find_first_free_syscall(int *ret)
{
int i;
/*
* Search the table looking for a slot...
*/
for (i = 0; i < SYS_MAXSYSCALL; i++)
if (sysent[i].sy_call == sys_lkmnosys) {
*ret = i;
return 0;
}
return ENFILE;
}
int
xfs_install_syscalls(void)
{
int error;
#ifdef AFS_SYSCALL
syscall_offset = AFS_SYSCALL;
#else
error = find_first_free_syscall(&syscall_offset);
if (error)
return error;
#endif
syscall_oldent = sysent[syscall_offset];
/* replace with new */
sysent[syscall_offset] = xfs_syscallent;
printf("syscall %d\n", syscall_offset);
return 0;
}
int
xfs_uninstall_syscalls(void)
{
/* replace current slot contents with old contents */
if (syscall_offset)
sysent[syscall_offset] = syscall_oldent;
return 0;
}
int
xfs_stat_syscalls(void)
{
return 0;
}
#elif defined(__FreeBSD__)
static int syscall_offset;
static struct sysent syscall_oldent;
static struct sysent xfs_syscallent = {
4,
xfs_syscall
};
static int
find_first_free_syscall(int *ret)
{
int i;
/*
* Search the table looking for a slot...
*/
for (i = 0; i < aout_sysvec.sv_size; i++)
if (aout_sysvec.sv_table[i].sy_call ==
(sy_call_t *) lkmnosys) {
*ret = i;
return 0;
}
return ENFILE;
}
int
xfs_install_syscalls(void)
{
int i;
int error;
#ifdef AFS_SYSCALL
i = AFS_SYSCALL;
#else
error = find_first_free_syscall(&i);
if (error)
return error;
#endif
syscall_oldent = aout_sysvec.sv_table[i];
aout_sysvec.sv_table[i] = xfs_syscallent;
syscall_offset = i;
printf("syscall %d\n", i);
return 0;
}
int
xfs_uninstall_syscalls(void)
{
if (syscall_offset) {
aout_sysvec.sv_table[syscall_offset].sy_call =
(sy_call_t *) lkmnosys;
}
return 0;
}
int
xfs_stat_syscalls(void)
{
return 0;
}
#endif
#endif /* ACTUALLY_LKM_NOT_KERNEL */
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