1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #define DEBUG_SUBSYSTEM S_LNET
38
39 #include "../../../include/linux/libcfs/libcfs.h"
40
41 #define LNET_MINOR 240
42
libcfs_ioctl_getdata(char * buf,char * end,void * arg)43 int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
44 {
45 struct libcfs_ioctl_hdr *hdr;
46 struct libcfs_ioctl_data *data;
47 int orig_len;
48
49 hdr = (struct libcfs_ioctl_hdr *)buf;
50 data = (struct libcfs_ioctl_data *)buf;
51
52 if (copy_from_user(buf, arg, sizeof(*hdr)))
53 return -EFAULT;
54
55 if (hdr->ioc_version != LIBCFS_IOCTL_VERSION) {
56 CERROR("PORTALS: version mismatch kernel vs application\n");
57 return -EINVAL;
58 }
59
60 if (hdr->ioc_len >= end - buf) {
61 CERROR("PORTALS: user buffer exceeds kernel buffer\n");
62 return -EINVAL;
63 }
64
65 if (hdr->ioc_len < sizeof(struct libcfs_ioctl_data)) {
66 CERROR("PORTALS: user buffer too small for ioctl\n");
67 return -EINVAL;
68 }
69
70 orig_len = hdr->ioc_len;
71 if (copy_from_user(buf, arg, hdr->ioc_len))
72 return -EFAULT;
73 if (orig_len != data->ioc_len)
74 return -EINVAL;
75
76 if (libcfs_ioctl_is_invalid(data)) {
77 CERROR("PORTALS: ioctl not correctly formatted\n");
78 return -EINVAL;
79 }
80
81 if (data->ioc_inllen1)
82 data->ioc_inlbuf1 = &data->ioc_bulk[0];
83
84 if (data->ioc_inllen2)
85 data->ioc_inlbuf2 = &data->ioc_bulk[0] +
86 cfs_size_round(data->ioc_inllen1);
87
88 return 0;
89 }
90
libcfs_ioctl_popdata(void * arg,void * data,int size)91 int libcfs_ioctl_popdata(void *arg, void *data, int size)
92 {
93 if (copy_to_user((char *)arg, data, size))
94 return -EFAULT;
95 return 0;
96 }
97
98 static int
libcfs_psdev_open(struct inode * inode,struct file * file)99 libcfs_psdev_open(struct inode *inode, struct file *file)
100 {
101 struct libcfs_device_userstate **pdu = NULL;
102 int rc = 0;
103
104 if (!inode)
105 return -EINVAL;
106 pdu = (struct libcfs_device_userstate **)&file->private_data;
107 if (libcfs_psdev_ops.p_open != NULL)
108 rc = libcfs_psdev_ops.p_open(0, (void *)pdu);
109 else
110 return -EPERM;
111 return rc;
112 }
113
114 /* called when closing /dev/device */
115 static int
libcfs_psdev_release(struct inode * inode,struct file * file)116 libcfs_psdev_release(struct inode *inode, struct file *file)
117 {
118 struct libcfs_device_userstate *pdu;
119 int rc = 0;
120
121 if (!inode)
122 return -EINVAL;
123 pdu = file->private_data;
124 if (libcfs_psdev_ops.p_close != NULL)
125 rc = libcfs_psdev_ops.p_close(0, (void *)pdu);
126 else
127 rc = -EPERM;
128 return rc;
129 }
130
libcfs_ioctl(struct file * file,unsigned int cmd,unsigned long arg)131 static long libcfs_ioctl(struct file *file,
132 unsigned int cmd, unsigned long arg)
133 {
134 struct cfs_psdev_file pfile;
135 int rc = 0;
136
137 if (!capable(CAP_SYS_ADMIN))
138 return -EACCES;
139
140 if (_IOC_TYPE(cmd) != IOC_LIBCFS_TYPE ||
141 _IOC_NR(cmd) < IOC_LIBCFS_MIN_NR ||
142 _IOC_NR(cmd) > IOC_LIBCFS_MAX_NR) {
143 CDEBUG(D_IOCTL, "invalid ioctl ( type %d, nr %d, size %d )\n",
144 _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));
145 return -EINVAL;
146 }
147
148 /* Handle platform-dependent IOC requests */
149 switch (cmd) {
150 case IOC_LIBCFS_PANIC:
151 if (!capable(CFS_CAP_SYS_BOOT))
152 return -EPERM;
153 panic("debugctl-invoked panic");
154 return 0;
155 case IOC_LIBCFS_MEMHOG:
156 if (!capable(CFS_CAP_SYS_ADMIN))
157 return -EPERM;
158 /* go thought */
159 }
160
161 pfile.off = 0;
162 pfile.private_data = file->private_data;
163 if (libcfs_psdev_ops.p_ioctl != NULL)
164 rc = libcfs_psdev_ops.p_ioctl(&pfile, cmd, (void *)arg);
165 else
166 rc = -EPERM;
167 return rc;
168 }
169
170 static const struct file_operations libcfs_fops = {
171 .unlocked_ioctl = libcfs_ioctl,
172 .open = libcfs_psdev_open,
173 .release = libcfs_psdev_release,
174 };
175
176 struct miscdevice libcfs_dev = {
177 .minor = LNET_MINOR,
178 .name = "lnet",
179 .fops = &libcfs_fops,
180 };
181