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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*/
#define DEBUG_SUBSYSTEM S_LNET
#include "../../../include/linux/libcfs/libcfs.h"
#define LNET_MINOR 240
static inline size_t libcfs_ioctl_packlen(struct libcfs_ioctl_data *data)
{
size_t len = sizeof(*data);
len += cfs_size_round(data->ioc_inllen1);
len += cfs_size_round(data->ioc_inllen2);
return len;
}
static inline bool libcfs_ioctl_is_invalid(struct libcfs_ioctl_data *data)
{
if (data->ioc_hdr.ioc_len > BIT(30)) {
CERROR("LIBCFS ioctl: ioc_len larger than 1<<30\n");
return true;
}
if (data->ioc_inllen1 > BIT(30)) {
CERROR("LIBCFS ioctl: ioc_inllen1 larger than 1<<30\n");
return true;
}
if (data->ioc_inllen2 > BIT(30)) {
CERROR("LIBCFS ioctl: ioc_inllen2 larger than 1<<30\n");
return true;
}
if (data->ioc_inlbuf1 && !data->ioc_inllen1) {
CERROR("LIBCFS ioctl: inlbuf1 pointer but 0 length\n");
return true;
}
if (data->ioc_inlbuf2 && !data->ioc_inllen2) {
CERROR("LIBCFS ioctl: inlbuf2 pointer but 0 length\n");
return true;
}
if (data->ioc_pbuf1 && !data->ioc_plen1) {
CERROR("LIBCFS ioctl: pbuf1 pointer but 0 length\n");
return true;
}
if (data->ioc_pbuf2 && !data->ioc_plen2) {
CERROR("LIBCFS ioctl: pbuf2 pointer but 0 length\n");
return true;
}
if (data->ioc_plen1 && !data->ioc_pbuf1) {
CERROR("LIBCFS ioctl: plen1 nonzero but no pbuf1 pointer\n");
return true;
}
if (data->ioc_plen2 && !data->ioc_pbuf2) {
CERROR("LIBCFS ioctl: plen2 nonzero but no pbuf2 pointer\n");
return true;
}
if ((u32)libcfs_ioctl_packlen(data) != data->ioc_hdr.ioc_len) {
CERROR("LIBCFS ioctl: packlen != ioc_len\n");
return true;
}
if (data->ioc_inllen1 &&
data->ioc_bulk[data->ioc_inllen1 - 1] != '\0') {
CERROR("LIBCFS ioctl: inlbuf1 not 0 terminated\n");
return true;
}
if (data->ioc_inllen2 &&
data->ioc_bulk[cfs_size_round(data->ioc_inllen1) +
data->ioc_inllen2 - 1] != '\0') {
CERROR("LIBCFS ioctl: inlbuf2 not 0 terminated\n");
return true;
}
return false;
}
int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data)
{
if (libcfs_ioctl_is_invalid(data)) {
CERROR("libcfs ioctl: parameter not correctly formatted\n");
return -EINVAL;
}
if (data->ioc_inllen1)
data->ioc_inlbuf1 = &data->ioc_bulk[0];
if (data->ioc_inllen2)
data->ioc_inlbuf2 = &data->ioc_bulk[0] +
cfs_size_round(data->ioc_inllen1);
return 0;
}
int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
const struct libcfs_ioctl_hdr __user *uhdr)
{
struct libcfs_ioctl_hdr hdr;
int err = 0;
if (copy_from_user(&hdr, uhdr, sizeof(hdr)))
return -EFAULT;
if (hdr.ioc_version != LIBCFS_IOCTL_VERSION &&
hdr.ioc_version != LIBCFS_IOCTL_VERSION2) {
CERROR("libcfs ioctl: version mismatch expected %#x, got %#x\n",
LIBCFS_IOCTL_VERSION, hdr.ioc_version);
return -EINVAL;
}
if (hdr.ioc_len < sizeof(struct libcfs_ioctl_data)) {
CERROR("libcfs ioctl: user buffer too small for ioctl\n");
return -EINVAL;
}
if (hdr.ioc_len > LIBCFS_IOC_DATA_MAX) {
CERROR("libcfs ioctl: user buffer is too large %d/%d\n",
hdr.ioc_len, LIBCFS_IOC_DATA_MAX);
return -EINVAL;
}
LIBCFS_ALLOC(*hdr_pp, hdr.ioc_len);
if (!*hdr_pp)
return -ENOMEM;
if (copy_from_user(*hdr_pp, uhdr, hdr.ioc_len)) {
LIBCFS_FREE(*hdr_pp, hdr.ioc_len);
err = -EFAULT;
}
return err;
}
static long
libcfs_psdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
_IOC_NR(cmd) < IOC_LIBCFS_MIN_NR ||
_IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
_IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
return -EINVAL;
}
return libcfs_ioctl(cmd, (void __user *)arg);
}
static const struct file_operations libcfs_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = libcfs_psdev_ioctl,
};
struct miscdevice libcfs_dev = {
.minor = LNET_MINOR,
.name = "lnet",
.fops = &libcfs_fops,
};
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