| /* |
| * 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, |
| }; |