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