fs/cifs/ioctl.c

   1 /*
   2  *   fs/cifs/ioctl.c
   3  *
   4  *   vfs operations that deal with io control
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2005,2013
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/fs.h>
  25 #include <linux/file.h>
  26 #include <linux/mount.h>
  27 #include <linux/mm.h>
  28 #include <linux/pagemap.h>
  29 #include "cifspdu.h"
  30 #include "cifsglob.h"
  31 #include "cifsproto.h"
  32 #include "cifs_debug.h"
  33 #include "cifsfs.h"
  34 #include "cifs_ioctl.h"
  35 #include "smb2proto.h"
  36 #include <linux/btrfs.h>
  37
  38 static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
  39                                   unsigned long p)
  40 {
  41         struct inode *inode = file_inode(filep);
  42         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
  43         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
  44         struct dentry *dentry = filep->f_path.dentry;
  45         const unsigned char *path;
  46         void *page = alloc_dentry_path();
  47         __le16 *utf16_path = NULL, root_path;
  48         int rc = 0;
  49
  50         path = build_path_from_dentry(dentry, page);
  51         if (IS_ERR(path)) {
  52                 free_dentry_path(page);
  53                 return PTR_ERR(path);
  54         }
  55
  56         cifs_dbg(FYI, "%s %s\n", __func__, path);
  57
  58         if (!path[0]) {
  59                 root_path = 0;
  60                 utf16_path = &root_path;
  61         } else {
  62                 utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
  63                 if (!utf16_path) {
  64                         rc = -ENOMEM;
  65                         goto ici_exit;
  66                 }
  67         }
  68
  69         if (tcon->ses->server->ops->ioctl_query_info)
  70                 rc = tcon->ses->server->ops->ioctl_query_info(
  71                                 xid, tcon, cifs_sb, utf16_path,
  72                                 filep->private_data ? 0 : 1, p);
  73         else
  74                 rc = -EOPNOTSUPP;
  75
  76  ici_exit:
  77         if (utf16_path != &root_path)
  78                 kfree(utf16_path);
  79         free_dentry_path(page);
  80         return rc;
  81 }
  82
  83 static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
  84                         unsigned long srcfd)
  85 {
  86         int rc;
  87         struct fd src_file;
  88         struct inode *src_inode;
  89
  90         cifs_dbg(FYI, "ioctl copychunk range\n");
  91         /* the destination must be opened for writing */
  92         if (!(dst_file->f_mode & FMODE_WRITE)) {
  93                 cifs_dbg(FYI, "file target not open for write\n");
  94                 return -EINVAL;
  95         }
  96
  97         /* check if target volume is readonly and take reference */
  98         rc = mnt_want_write_file(dst_file);
  99         if (rc) {
 100                 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
 101                 return rc;
 102         }
 103
 104         src_file = fdget(srcfd);
 105         if (!src_file.file) {
 106                 rc = -EBADF;
 107                 goto out_drop_write;
 108         }
 109
 110         if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
 111                 rc = -EBADF;
 112                 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 113                 goto out_fput;
 114         }
 115
 116         src_inode = file_inode(src_file.file);
 117         rc = -EINVAL;
 118         if (S_ISDIR(src_inode->i_mode))
 119                 goto out_fput;
 120
 121         rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 122                                         src_inode->i_size, 0);
 123         if (rc > 0)
 124                 rc = 0;
 125 out_fput:
 126         fdput(src_file);
 127 out_drop_write:
 128         mnt_drop_write_file(dst_file);
 129         return rc;
 130 }
 131
 132 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 133                                 void __user *arg)
 134 {
 135         int rc = 0;
 136         struct smb_mnt_fs_info *fsinf;
 137
 138         fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 139         if (fsinf == NULL)
 140                 return -ENOMEM;
 141
 142         fsinf->version = 1;
 143         fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 144         fsinf->device_characteristics =
 145                         le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 146         fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 147         fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 148         fsinf->max_path_component =
 149                 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 150         fsinf->vol_serial_number = tcon->vol_serial_number;
 151         fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 152         fsinf->share_flags = tcon->share_flags;
 153         fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 154         fsinf->sector_flags = tcon->ss_flags;
 155         fsinf->optimal_sector_size = tcon->perf_sector_size;
 156         fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 157         fsinf->maximal_access = tcon->maximal_access;
 158         fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 159
 160         if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 161                 rc = -EFAULT;
 162
 163         kfree(fsinf);
 164         return rc;
 165 }
 166
 167 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 168 {
 169         struct inode *inode = file_inode(filep);
 170         struct smb3_key_debug_info pkey_inf;
 171         int rc = -ENOTTY; /* strange error - but the precedent */
 172         unsigned int xid;
 173         struct cifsFileInfo *pSMBFile = filep->private_data;
 174         struct cifs_tcon *tcon;
 175         struct tcon_link *tlink;
 176         struct cifs_sb_info *cifs_sb;
 177         __u64   ExtAttrBits = 0;
 178         __u64   caps;
 179
 180         xid = get_xid();
 181
 182         cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
 183         switch (command) {
 184                 case FS_IOC_GETFLAGS:
 185                         if (pSMBFile == NULL)
 186                                 break;
 187                         tcon = tlink_tcon(pSMBFile->tlink);
 188                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 189 #ifdef CONFIG_CIFS_POSIX
 190                         if (CIFS_UNIX_EXTATTR_CAP & caps) {
 191                                 __u64   ExtAttrMask = 0;
 192                                 rc = CIFSGetExtAttr(xid, tcon,
 193                                                     pSMBFile->fid.netfid,
 194                                                     &ExtAttrBits, &ExtAttrMask);
 195                                 if (rc == 0)
 196                                         rc = put_user(ExtAttrBits &
 197                                                 FS_FL_USER_VISIBLE,
 198                                                 (int __user *)arg);
 199                                 if (rc != EOPNOTSUPP)
 200                                         break;
 201                         }
 202 #endif /* CONFIG_CIFS_POSIX */
 203                         rc = 0;
 204                         if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 205                                 /* add in the compressed bit */
 206                                 ExtAttrBits = FS_COMPR_FL;
 207                                 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 208                                               (int __user *)arg);
 209                         }
 210                         break;
 211                 case FS_IOC_SETFLAGS:
 212                         if (pSMBFile == NULL)
 213                                 break;
 214                         tcon = tlink_tcon(pSMBFile->tlink);
 215                         caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 216
 217                         if (get_user(ExtAttrBits, (int __user *)arg)) {
 218                                 rc = -EFAULT;
 219                                 break;
 220                         }
 221
 222                         /*
 223                          * if (CIFS_UNIX_EXTATTR_CAP & caps)
 224                          *      rc = CIFSSetExtAttr(xid, tcon,
 225                          *                     pSMBFile->fid.netfid,
 226                          *                     extAttrBits,
 227                          *                     &ExtAttrMask);
 228                          * if (rc != EOPNOTSUPP)
 229                          *      break;
 230                          */
 231
 232                         /* Currently only flag we can set is compressed flag */
 233                         if ((ExtAttrBits & FS_COMPR_FL) == 0)
 234                                 break;
 235
 236                         /* Try to set compress flag */
 237                         if (tcon->ses->server->ops->set_compression) {
 238                                 rc = tcon->ses->server->ops->set_compression(
 239                                                         xid, tcon, pSMBFile);
 240                                 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 241                         }
 242                         break;
 243                 case CIFS_IOC_COPYCHUNK_FILE:
 244                         rc = cifs_ioctl_copychunk(xid, filep, arg);
 245                         break;
 246                 case CIFS_QUERY_INFO:
 247                         rc = cifs_ioctl_query_info(xid, filep, arg);
 248                         break;
 249                 case CIFS_IOC_SET_INTEGRITY:
 250                         if (pSMBFile == NULL)
 251                                 break;
 252                         tcon = tlink_tcon(pSMBFile->tlink);
 253                         if (tcon->ses->server->ops->set_integrity)
 254                                 rc = tcon->ses->server->ops->set_integrity(xid,
 255                                                 tcon, pSMBFile);
 256                         else
 257                                 rc = -EOPNOTSUPP;
 258                         break;
 259                 case CIFS_IOC_GET_MNT_INFO:
 260                         if (pSMBFile == NULL)
 261                                 break;
 262                         tcon = tlink_tcon(pSMBFile->tlink);
 263                         rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 264                         break;
 265                 case CIFS_ENUMERATE_SNAPSHOTS:
 266                         if (pSMBFile == NULL)
 267                                 break;
 268                         if (arg == 0) {
 269                                 rc = -EINVAL;
 270                                 goto cifs_ioc_exit;
 271                         }
 272                         tcon = tlink_tcon(pSMBFile->tlink);
 273                         if (tcon->ses->server->ops->enum_snapshots)
 274                                 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
 275                                                 pSMBFile, (void __user *)arg);
 276                         else
 277                                 rc = -EOPNOTSUPP;
 278                         break;
 279                 case CIFS_DUMP_KEY:
 280                         if (pSMBFile == NULL)
 281                                 break;
 282                         if (!capable(CAP_SYS_ADMIN)) {
 283                                 rc = -EACCES;
 284                                 break;
 285                         }
 286
 287                         tcon = tlink_tcon(pSMBFile->tlink);
 288                         if (!smb3_encryption_required(tcon)) {
 289                                 rc = -EOPNOTSUPP;
 290                                 break;
 291                         }
 292                         pkey_inf.cipher_type =
 293                                 le16_to_cpu(tcon->ses->server->cipher_type);
 294                         pkey_inf.Suid = tcon->ses->Suid;
 295                         memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
 296                                         16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
 297                         memcpy(pkey_inf.smb3decryptionkey,
 298                               tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 299                         memcpy(pkey_inf.smb3encryptionkey,
 300                               tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE);
 301                         if (copy_to_user((void __user *)arg, &pkey_inf,
 302                                         sizeof(struct smb3_key_debug_info)))
 303                                 rc = -EFAULT;
 304                         else
 305                                 rc = 0;
 306                         break;
 307                 case CIFS_IOC_NOTIFY:
 308                         if (!S_ISDIR(inode->i_mode)) {
 309                                 /* Notify can only be done on directories */
 310                                 rc = -EOPNOTSUPP;
 311                                 break;
 312                         }
 313                         cifs_sb = CIFS_SB(inode->i_sb);
 314                         tlink = cifs_sb_tlink(cifs_sb);
 315                         if (IS_ERR(tlink)) {
 316                                 rc = PTR_ERR(tlink);
 317                                 break;
 318                         }
 319                         tcon = tlink_tcon(tlink);
 320                         if (tcon && tcon->ses->server->ops->notify) {
 321                                 rc = tcon->ses->server->ops->notify(xid,
 322                                                 filep, (void __user *)arg);
 323                                 cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
 324                         } else
 325                                 rc = -EOPNOTSUPP;
 326                         cifs_put_tlink(tlink);
 327                         break;
 328                 default:
 329                         cifs_dbg(FYI, "unsupported ioctl\n");
 330                         break;
 331         }
 332 cifs_ioc_exit:
 333         free_xid(xid);
 334         return rc;
 335 }