4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_LNET
36 #include <linux/miscdevice.h>
37 #include <linux/uaccess.h>
38 #include <libcfs/libcfs.h>
40 static inline size_t libcfs_ioctl_packlen(struct libcfs_ioctl_data *data)
42 size_t len = sizeof(*data);
44 len += (data->ioc_inllen1 + 7) & ~7;
45 len += (data->ioc_inllen2 + 7) & ~7;
49 static bool libcfs_ioctl_is_invalid(struct libcfs_ioctl_data *data)
51 if (data->ioc_hdr.ioc_len > BIT(30))
54 if (data->ioc_inllen1 > BIT(30))
57 if (data->ioc_inllen2 > BIT(30))
60 if (data->ioc_inlbuf1 && !data->ioc_inllen1)
63 if (data->ioc_inlbuf2 && !data->ioc_inllen2)
66 if (data->ioc_pbuf1 && !data->ioc_plen1)
69 if (data->ioc_pbuf2 && !data->ioc_plen2)
72 if (data->ioc_plen1 && !data->ioc_pbuf1)
75 if (data->ioc_plen2 && !data->ioc_pbuf2)
78 if (libcfs_ioctl_packlen(data) != data->ioc_hdr.ioc_len)
81 if (data->ioc_inllen1 &&
82 data->ioc_bulk[((data->ioc_inllen1 + 7) & ~7) +
83 data->ioc_inllen2 - 1] != '\0')
89 int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data)
93 if (libcfs_ioctl_is_invalid(data)) {
94 CERROR("libcfs ioctl: parameter not correctly formatted\n");
98 if (data->ioc_inllen1 != 0)
99 data->ioc_inlbuf1 = &data->ioc_bulk[0];
101 if (data->ioc_inllen2 != 0)
102 data->ioc_inlbuf2 = &data->ioc_bulk[0] +
103 cfs_size_round(data->ioc_inllen1);
108 int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
109 struct libcfs_ioctl_hdr __user *uhdr)
111 struct libcfs_ioctl_hdr hdr;
115 if (copy_from_user(&hdr, uhdr, sizeof(hdr)))
118 if (hdr.ioc_version != LIBCFS_IOCTL_VERSION &&
119 hdr.ioc_version != LIBCFS_IOCTL_VERSION2) {
120 CERROR("libcfs ioctl: version mismatch expected %#x, got %#x\n",
121 LIBCFS_IOCTL_VERSION, hdr.ioc_version);
125 if (hdr.ioc_len < sizeof(struct libcfs_ioctl_hdr)) {
126 CERROR("libcfs ioctl: user buffer too small for ioctl\n");
130 if (hdr.ioc_len > LIBCFS_IOC_DATA_MAX) {
131 CERROR("libcfs ioctl: user buffer is too large %d/%d\n",
132 hdr.ioc_len, LIBCFS_IOC_DATA_MAX);
136 LIBCFS_ALLOC(*hdr_pp, hdr.ioc_len);
140 if (copy_from_user(*hdr_pp, uhdr, hdr.ioc_len))
141 GOTO(free, err = -EFAULT);
143 if ((*hdr_pp)->ioc_version != hdr.ioc_version ||
144 (*hdr_pp)->ioc_len != hdr.ioc_len) {
145 GOTO(free, err = -EINVAL);
151 LIBCFS_FREE(*hdr_pp, hdr.ioc_len);
156 libcfs_psdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
158 if (!capable(CAP_SYS_ADMIN))
161 if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
162 _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR ||
163 _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
164 CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
165 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
169 return libcfs_ioctl(cmd, (void __user *)arg);
172 static struct file_operations libcfs_fops = {
173 .owner = THIS_MODULE,
174 .unlocked_ioctl = libcfs_psdev_ioctl,
177 struct miscdevice libcfs_dev = {
178 .minor = MISC_DYNAMIC_MINOR,