fs/ncpfs/ioctl.c

   1 /*
   2  *  ioctl.c
   3  *
   4  *  Copyright (C) 1995, 1996 by Volker Lendecke
   5  *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
   6  *  Modified 1998, 1999 Wolfram Pienkoss for NLS
   7  *
   8  */
   9
  10 #include <linux/capability.h>
  11 #include <linux/compat.h>
  12 #include <linux/errno.h>
  13 #include <linux/fs.h>
  14 #include <linux/ioctl.h>
  15 #include <linux/time.h>
  16 #include <linux/mm.h>
  17 #include <linux/mount.h>
  18 #include <linux/highuid.h>
  19 #include <linux/smp_lock.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/sched.h>
  22
  23 #include <linux/ncp_fs.h>
  24
  25 #include <asm/uaccess.h>
  26
  27 #include "ncplib_kernel.h"
  28
  29 /* maximum limit for ncp_objectname_ioctl */
  30 #define NCP_OBJECT_NAME_MAX_LEN 4096
  31 /* maximum limit for ncp_privatedata_ioctl */
  32 #define NCP_PRIVATE_DATA_MAX_LEN 8192
  33 /* maximum negotiable packet size */
  34 #define NCP_PACKET_SIZE_INTERNAL 65536
  35
  36 static int
  37 ncp_get_fs_info(struct ncp_server * server, struct file *file,
  38                 struct ncp_fs_info __user *arg)
  39 {
  40         struct inode *inode = file->f_path.dentry->d_inode;
  41         struct ncp_fs_info info;
  42
  43         if ((file_permission(file, MAY_WRITE) != 0)
  44             && (current->uid != server->m.mounted_uid)) {
  45                 return -EACCES;
  46         }
  47         if (copy_from_user(&info, arg, sizeof(info)))
  48                 return -EFAULT;
  49
  50         if (info.version != NCP_GET_FS_INFO_VERSION) {
  51                 DPRINTK("info.version invalid: %d\n", info.version);
  52                 return -EINVAL;
  53         }
  54         /* TODO: info.addr = server->m.serv_addr; */
  55         SET_UID(info.mounted_uid, server->m.mounted_uid);
  56         info.connection         = server->connection;
  57         info.buffer_size        = server->buffer_size;
  58         info.volume_number      = NCP_FINFO(inode)->volNumber;
  59         info.directory_id       = NCP_FINFO(inode)->DosDirNum;
  60
  61         if (copy_to_user(arg, &info, sizeof(info)))
  62                 return -EFAULT;
  63         return 0;
  64 }
  65
  66 static int
  67 ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
  68                    struct ncp_fs_info_v2 __user * arg)
  69 {
  70         struct inode *inode = file->f_path.dentry->d_inode;
  71         struct ncp_fs_info_v2 info2;
  72
  73         if ((file_permission(file, MAY_WRITE) != 0)
  74             && (current->uid != server->m.mounted_uid)) {
  75                 return -EACCES;
  76         }
  77         if (copy_from_user(&info2, arg, sizeof(info2)))
  78                 return -EFAULT;
  79
  80         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
  81                 DPRINTK("info.version invalid: %d\n", info2.version);
  82                 return -EINVAL;
  83         }
  84         info2.mounted_uid   = server->m.mounted_uid;
  85         info2.connection    = server->connection;
  86         info2.buffer_size   = server->buffer_size;
  87         info2.volume_number = NCP_FINFO(inode)->volNumber;
  88         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
  89         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
  90
  91         if (copy_to_user(arg, &info2, sizeof(info2)))
  92                 return -EFAULT;
  93         return 0;
  94 }
  95
  96 #ifdef CONFIG_COMPAT
  97 struct compat_ncp_objectname_ioctl
  98 {
  99         s32             auth_type;
 100         u32             object_name_len;
 101         compat_caddr_t  object_name;    /* an userspace data, in most cases user name */
 102 };
 103
 104 struct compat_ncp_fs_info_v2 {
 105         s32 version;
 106         u32 mounted_uid;
 107         u32 connection;
 108         u32 buffer_size;
 109
 110         u32 volume_number;
 111         u32 directory_id;
 112
 113         u32 dummy1;
 114         u32 dummy2;
 115         u32 dummy3;
 116 };
 117
 118 struct compat_ncp_ioctl_request {
 119         u32 function;
 120         u32 size;
 121         compat_caddr_t data;
 122 };
 123
 124 struct compat_ncp_privatedata_ioctl
 125 {
 126         u32             len;
 127         compat_caddr_t  data;           /* ~1000 for NDS */
 128 };
 129
 130 #define NCP_IOC_GET_FS_INFO_V2_32       _IOWR('n', 4, struct compat_ncp_fs_info_v2)
 131 #define NCP_IOC_NCPREQUEST_32           _IOR('n', 1, struct compat_ncp_ioctl_request)
 132 #define NCP_IOC_GETOBJECTNAME_32        _IOWR('n', 9, struct compat_ncp_objectname_ioctl)
 133 #define NCP_IOC_SETOBJECTNAME_32        _IOR('n', 9, struct compat_ncp_objectname_ioctl)
 134 #define NCP_IOC_GETPRIVATEDATA_32       _IOWR('n', 10, struct compat_ncp_privatedata_ioctl)
 135 #define NCP_IOC_SETPRIVATEDATA_32       _IOR('n', 10, struct compat_ncp_privatedata_ioctl)
 136
 137 static int
 138 ncp_get_compat_fs_info_v2(struct ncp_server * server, struct file *file,
 139                    struct compat_ncp_fs_info_v2 __user * arg)
 140 {
 141         struct inode *inode = file->f_path.dentry->d_inode;
 142         struct compat_ncp_fs_info_v2 info2;
 143
 144         if ((file_permission(file, MAY_WRITE) != 0)
 145             && (current->uid != server->m.mounted_uid)) {
 146                 return -EACCES;
 147         }
 148         if (copy_from_user(&info2, arg, sizeof(info2)))
 149                 return -EFAULT;
 150
 151         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
 152                 DPRINTK("info.version invalid: %d\n", info2.version);
 153                 return -EINVAL;
 154         }
 155         info2.mounted_uid   = server->m.mounted_uid;
 156         info2.connection    = server->connection;
 157         info2.buffer_size   = server->buffer_size;
 158         info2.volume_number = NCP_FINFO(inode)->volNumber;
 159         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
 160         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
 161
 162         if (copy_to_user(arg, &info2, sizeof(info2)))
 163                 return -EFAULT;
 164         return 0;
 165 }
 166 #endif
 167
 168 #define NCP_IOC_GETMOUNTUID16           _IOW('n', 2, u16)
 169 #define NCP_IOC_GETMOUNTUID32           _IOW('n', 2, u32)
 170 #define NCP_IOC_GETMOUNTUID64           _IOW('n', 2, u64)
 171
 172 #ifdef CONFIG_NCPFS_NLS
 173 /* Here we are select the iocharset and the codepage for NLS.
 174  * Thanks Petr Vandrovec for idea and many hints.
 175  */
 176 static int
 177 ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 178 {
 179         struct ncp_nls_ioctl user;
 180         struct nls_table *codepage;
 181         struct nls_table *iocharset;
 182         struct nls_table *oldset_io;
 183         struct nls_table *oldset_cp;
 184
 185         if (!capable(CAP_SYS_ADMIN))
 186                 return -EACCES;
 187         if (server->root_setuped)
 188                 return -EBUSY;
 189
 190         if (copy_from_user(&user, arg, sizeof(user)))
 191                 return -EFAULT;
 192
 193         codepage = NULL;
 194         user.codepage[NCP_IOCSNAME_LEN] = 0;
 195         if (!user.codepage[0] || !strcmp(user.codepage, "default"))
 196                 codepage = load_nls_default();
 197         else {
 198                 codepage = load_nls(user.codepage);
 199                 if (!codepage) {
 200                         return -EBADRQC;
 201                 }
 202         }
 203
 204         iocharset = NULL;
 205         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 206         if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
 207                 iocharset = load_nls_default();
 208                 NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 209         } else if (!strcmp(user.iocharset, "utf8")) {
 210                 iocharset = load_nls_default();
 211                 NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 212         } else {
 213                 iocharset = load_nls(user.iocharset);
 214                 if (!iocharset) {
 215                         unload_nls(codepage);
 216                         return -EBADRQC;
 217                 }
 218                 NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 219         }
 220
 221         oldset_cp = server->nls_vol;
 222         server->nls_vol = codepage;
 223         oldset_io = server->nls_io;
 224         server->nls_io = iocharset;
 225
 226         if (oldset_cp)
 227                 unload_nls(oldset_cp);
 228         if (oldset_io)
 229                 unload_nls(oldset_io);
 230
 231         return 0;
 232 }
 233
 234 static int
 235 ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 236 {
 237         struct ncp_nls_ioctl user;
 238         int len;
 239
 240         memset(&user, 0, sizeof(user));
 241         if (server->nls_vol && server->nls_vol->charset) {
 242                 len = strlen(server->nls_vol->charset);
 243                 if (len > NCP_IOCSNAME_LEN)
 244                         len = NCP_IOCSNAME_LEN;
 245                 strncpy(user.codepage, server->nls_vol->charset, len);
 246                 user.codepage[len] = 0;
 247         }
 248
 249         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 250                 strcpy(user.iocharset, "utf8");
 251         else if (server->nls_io && server->nls_io->charset) {
 252                 len = strlen(server->nls_io->charset);
 253                 if (len > NCP_IOCSNAME_LEN)
 254                         len = NCP_IOCSNAME_LEN;
 255                 strncpy(user.iocharset, server->nls_io->charset, len);
 256                 user.iocharset[len] = 0;
 257         }
 258
 259         if (copy_to_user(arg, &user, sizeof(user)))
 260                 return -EFAULT;
 261         return 0;
 262 }
 263 #endif /* CONFIG_NCPFS_NLS */
 264
 265 static int __ncp_ioctl(struct inode *inode, struct file *filp,
 266               unsigned int cmd, unsigned long arg)
 267 {
 268         struct ncp_server *server = NCP_SERVER(inode);
 269         int result;
 270         struct ncp_ioctl_request request;
 271         char* bouncebuffer;
 272         void __user *argp = (void __user *)arg;
 273
 274         switch (cmd) {
 275 #ifdef CONFIG_COMPAT
 276         case NCP_IOC_NCPREQUEST_32:
 277 #endif
 278         case NCP_IOC_NCPREQUEST:
 279                 if ((file_permission(filp, MAY_WRITE) != 0)
 280                     && (current->uid != server->m.mounted_uid)) {
 281                         return -EACCES;
 282                 }
 283 #ifdef CONFIG_COMPAT
 284                 if (cmd == NCP_IOC_NCPREQUEST_32) {
 285                         struct compat_ncp_ioctl_request request32;
 286                         if (copy_from_user(&request32, argp, sizeof(request32)))
 287                                 return -EFAULT;
 288                         request.function = request32.function;
 289                         request.size = request32.size;
 290                         request.data = compat_ptr(request32.data);
 291                 } else
 292 #endif
 293                 if (copy_from_user(&request, argp, sizeof(request)))
 294                         return -EFAULT;
 295
 296                 if ((request.function > 255)
 297                     || (request.size >
 298                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
 299                         return -EINVAL;
 300                 }
 301                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
 302                 if (!bouncebuffer)
 303                         return -ENOMEM;
 304                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
 305                         vfree(bouncebuffer);
 306                         return -EFAULT;
 307                 }
 308                 ncp_lock_server(server);
 309
 310                 /* FIXME: We hack around in the server's structures
 311                    here to be able to use ncp_request */
 312
 313                 server->has_subfunction = 0;
 314                 server->current_size = request.size;
 315                 memcpy(server->packet, bouncebuffer, request.size);
 316
 317                 result = ncp_request2(server, request.function,
 318                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
 319                 if (result < 0)
 320                         result = -EIO;
 321                 else
 322                         result = server->reply_size;
 323                 ncp_unlock_server(server);
 324                 DPRINTK("ncp_ioctl: copy %d bytes\n",
 325                         result);
 326                 if (result >= 0)
 327                         if (copy_to_user(request.data, bouncebuffer, result))
 328                                 result = -EFAULT;
 329                 vfree(bouncebuffer);
 330                 return result;
 331
 332         case NCP_IOC_CONN_LOGGED_IN:
 333
 334                 if (!capable(CAP_SYS_ADMIN))
 335                         return -EACCES;
 336                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
 337                         return -EINVAL;
 338                 if (server->root_setuped)
 339                         return -EBUSY;
 340                 server->root_setuped = 1;
 341                 return ncp_conn_logged_in(inode->i_sb);
 342
 343         case NCP_IOC_GET_FS_INFO:
 344                 return ncp_get_fs_info(server, filp, argp);
 345
 346         case NCP_IOC_GET_FS_INFO_V2:
 347                 return ncp_get_fs_info_v2(server, filp, argp);
 348
 349 #ifdef CONFIG_COMPAT
 350         case NCP_IOC_GET_FS_INFO_V2_32:
 351                 return ncp_get_compat_fs_info_v2(server, filp, argp);
 352 #endif
 353         /* we have too many combinations of CONFIG_COMPAT,
 354          * CONFIG_64BIT and CONFIG_UID16, so just handle
 355          * any of the possible ioctls */
 356         case NCP_IOC_GETMOUNTUID16:
 357         case NCP_IOC_GETMOUNTUID32:
 358         case NCP_IOC_GETMOUNTUID64:
 359                 if ((file_permission(filp, MAY_READ) != 0)
 360                         && (current->uid != server->m.mounted_uid)) {
 361                         return -EACCES;
 362                 }
 363                 if (cmd == NCP_IOC_GETMOUNTUID16) {
 364                         u16 uid;
 365                         SET_UID(uid, server->m.mounted_uid);
 366                         if (put_user(uid, (u16 __user *)argp))
 367                                 return -EFAULT;
 368                 } else if (cmd == NCP_IOC_GETMOUNTUID32) {
 369                         if (put_user(server->m.mounted_uid,
 370                                                 (u32 __user *)argp))
 371                                 return -EFAULT;
 372                 } else {
 373                         if (put_user(server->m.mounted_uid,
 374                                                 (u64 __user *)argp))
 375                                 return -EFAULT;
 376                 }
 377                 return 0;
 378
 379         case NCP_IOC_GETROOT:
 380                 {
 381                         struct ncp_setroot_ioctl sr;
 382
 383                         if ((file_permission(filp, MAY_READ) != 0)
 384                             && (current->uid != server->m.mounted_uid))
 385                         {
 386                                 return -EACCES;
 387                         }
 388                         if (server->m.mounted_vol[0]) {
 389                                 struct dentry* dentry = inode->i_sb->s_root;
 390
 391                                 if (dentry) {
 392                                         struct inode* inode = dentry->d_inode;
 393
 394                                         if (inode) {
 395                                                 sr.volNumber = NCP_FINFO(inode)->volNumber;
 396                                                 sr.dirEntNum = NCP_FINFO(inode)->dirEntNum;
 397                                                 sr.namespace = server->name_space[sr.volNumber];
 398                                         } else
 399                                                 DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 400                                 } else
 401                                         DPRINTK("ncpfs: s_root==NULL\n");
 402                         } else {
 403                                 sr.volNumber = -1;
 404                                 sr.namespace = 0;
 405                                 sr.dirEntNum = 0;
 406                         }
 407                         if (copy_to_user(argp, &sr, sizeof(sr)))
 408                                 return -EFAULT;
 409                         return 0;
 410                 }
 411         case NCP_IOC_SETROOT:
 412                 {
 413                         struct ncp_setroot_ioctl sr;
 414                         __u32 vnum;
 415                         __le32 de;
 416                         __le32 dosde;
 417                         struct dentry* dentry;
 418
 419                         if (!capable(CAP_SYS_ADMIN))
 420                         {
 421                                 return -EACCES;
 422                         }
 423                         if (server->root_setuped) return -EBUSY;
 424                         if (copy_from_user(&sr, argp, sizeof(sr)))
 425                                 return -EFAULT;
 426                         if (sr.volNumber < 0) {
 427                                 server->m.mounted_vol[0] = 0;
 428                                 vnum = NCP_NUMBER_OF_VOLUMES;
 429                                 de = 0;
 430                                 dosde = 0;
 431                         } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 432                                 return -EINVAL;
 433                         } else if (ncp_mount_subdir(server, sr.volNumber,
 434                                                 sr.namespace, sr.dirEntNum,
 435                                                 &vnum, &de, &dosde)) {
 436                                 return -ENOENT;
 437                         }
 438
 439                         dentry = inode->i_sb->s_root;
 440                         server->root_setuped = 1;
 441                         if (dentry) {
 442                                 struct inode* inode = dentry->d_inode;
 443
 444                                 if (inode) {
 445                                         NCP_FINFO(inode)->volNumber = vnum;
 446                                         NCP_FINFO(inode)->dirEntNum = de;
 447                                         NCP_FINFO(inode)->DosDirNum = dosde;
 448                                 } else
 449                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 450                         } else
 451                                 DPRINTK("ncpfs: s_root==NULL\n");
 452
 453                         return 0;
 454                 }
 455
 456 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 457         case NCP_IOC_SIGN_INIT:
 458                 if ((file_permission(filp, MAY_WRITE) != 0)
 459                     && (current->uid != server->m.mounted_uid))
 460                 {
 461                         return -EACCES;
 462                 }
 463                 if (argp) {
 464                         if (server->sign_wanted)
 465                         {
 466                                 struct ncp_sign_init sign;
 467
 468                                 if (copy_from_user(&sign, argp, sizeof(sign)))
 469                                         return -EFAULT;
 470                                 memcpy(server->sign_root,sign.sign_root,8);
 471                                 memcpy(server->sign_last,sign.sign_last,16);
 472                                 server->sign_active = 1;
 473                         }
 474                         /* ignore when signatures not wanted */
 475                 } else {
 476                         server->sign_active = 0;
 477                 }
 478                 return 0;
 479
 480         case NCP_IOC_SIGN_WANTED:
 481                 if ((file_permission(filp, MAY_READ) != 0)
 482                     && (current->uid != server->m.mounted_uid))
 483                 {
 484                         return -EACCES;
 485                 }
 486
 487                 if (put_user(server->sign_wanted, (int __user *)argp))
 488                         return -EFAULT;
 489                 return 0;
 490         case NCP_IOC_SET_SIGN_WANTED:
 491                 {
 492                         int newstate;
 493
 494                         if ((file_permission(filp, MAY_WRITE) != 0)
 495                             && (current->uid != server->m.mounted_uid))
 496                         {
 497                                 return -EACCES;
 498                         }
 499                         /* get only low 8 bits... */
 500                         if (get_user(newstate, (unsigned char __user *)argp))
 501                                 return -EFAULT;
 502                         if (server->sign_active) {
 503                                 /* cannot turn signatures OFF when active */
 504                                 if (!newstate) return -EINVAL;
 505                         } else {
 506                                 server->sign_wanted = newstate != 0;
 507                         }
 508                         return 0;
 509                 }
 510
 511 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 512
 513 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 514         case NCP_IOC_LOCKUNLOCK:
 515                 if ((file_permission(filp, MAY_WRITE) != 0)
 516                     && (current->uid != server->m.mounted_uid))
 517                 {
 518                         return -EACCES;
 519                 }
 520                 {
 521                         struct ncp_lock_ioctl    rqdata;
 522                         int result;
 523
 524                         if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
 525                                 return -EFAULT;
 526                         if (rqdata.origin != 0)
 527                                 return -EINVAL;
 528                         /* check for cmd */
 529                         switch (rqdata.cmd) {
 530                                 case NCP_LOCK_EX:
 531                                 case NCP_LOCK_SH:
 532                                                 if (rqdata.timeout == 0)
 533                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 534                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 535                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 536                                                 break;
 537                                 case NCP_LOCK_LOG:
 538                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 539                                 case NCP_LOCK_CLEAR:
 540                                                 break;
 541                                 default:
 542                                                 return -EINVAL;
 543                         }
 544                         /* locking needs both read and write access */
 545                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 546                         {
 547                                 return result;
 548                         }
 549                         result = -EIO;
 550                         if (!ncp_conn_valid(server))
 551                                 goto outrel;
 552                         result = -EISDIR;
 553                         if (!S_ISREG(inode->i_mode))
 554                                 goto outrel;
 555                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 556                         {
 557                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 558                                                         NCP_FINFO(inode)->file_handle,
 559                                                         rqdata.offset,
 560                                                         rqdata.length);
 561                                 if (result > 0) result = 0;     /* no such lock */
 562                         }
 563                         else
 564                         {
 565                                 int lockcmd;
 566
 567                                 switch (rqdata.cmd)
 568                                 {
 569                                         case NCP_LOCK_EX:  lockcmd=1; break;
 570                                         case NCP_LOCK_SH:  lockcmd=3; break;
 571                                         default:           lockcmd=0; break;
 572                                 }
 573                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 574                                                         NCP_FINFO(inode)->file_handle,
 575                                                         lockcmd,
 576                                                         rqdata.offset,
 577                                                         rqdata.length,
 578                                                         rqdata.timeout);
 579                                 if (result > 0) result = -EAGAIN;
 580                         }
 581 outrel:
 582                         ncp_inode_close(inode);
 583                         return result;
 584                 }
 585 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 586
 587 #ifdef CONFIG_COMPAT
 588         case NCP_IOC_GETOBJECTNAME_32:
 589                 if (current->uid != server->m.mounted_uid) {
 590                         return -EACCES;
 591                 }
 592                 {
 593                         struct compat_ncp_objectname_ioctl user;
 594                         size_t outl;
 595
 596                         if (copy_from_user(&user, argp, sizeof(user)))
 597                                 return -EFAULT;
 598                         user.auth_type = server->auth.auth_type;
 599                         outl = user.object_name_len;
 600                         user.object_name_len = server->auth.object_name_len;
 601                         if (outl > user.object_name_len)
 602                                 outl = user.object_name_len;
 603                         if (outl) {
 604                                 if (copy_to_user(compat_ptr(user.object_name),
 605                                                  server->auth.object_name,
 606                                                  outl)) return -EFAULT;
 607                         }
 608                         if (copy_to_user(argp, &user, sizeof(user)))
 609                                 return -EFAULT;
 610                         return 0;
 611                 }
 612 #endif
 613         case NCP_IOC_GETOBJECTNAME:
 614                 if (current->uid != server->m.mounted_uid) {
 615                         return -EACCES;
 616                 }
 617                 {
 618                         struct ncp_objectname_ioctl user;
 619                         size_t outl;
 620
 621                         if (copy_from_user(&user, argp, sizeof(user)))
 622                                 return -EFAULT;
 623                         user.auth_type = server->auth.auth_type;
 624                         outl = user.object_name_len;
 625                         user.object_name_len = server->auth.object_name_len;
 626                         if (outl > user.object_name_len)
 627                                 outl = user.object_name_len;
 628                         if (outl) {
 629                                 if (copy_to_user(user.object_name,
 630                                                  server->auth.object_name,
 631                                                  outl)) return -EFAULT;
 632                         }
 633                         if (copy_to_user(argp, &user, sizeof(user)))
 634                                 return -EFAULT;
 635                         return 0;
 636                 }
 637 #ifdef CONFIG_COMPAT
 638         case NCP_IOC_SETOBJECTNAME_32:
 639 #endif
 640         case NCP_IOC_SETOBJECTNAME:
 641                 if (current->uid != server->m.mounted_uid) {
 642                         return -EACCES;
 643                 }
 644                 {
 645                         struct ncp_objectname_ioctl user;
 646                         void* newname;
 647                         void* oldname;
 648                         size_t oldnamelen;
 649                         void* oldprivate;
 650                         size_t oldprivatelen;
 651
 652 #ifdef CONFIG_COMPAT
 653                         if (cmd == NCP_IOC_SETOBJECTNAME_32) {
 654                                 struct compat_ncp_objectname_ioctl user32;
 655                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 656                                         return -EFAULT;
 657                                 user.auth_type = user32.auth_type;
 658                                 user.object_name_len = user32.object_name_len;
 659                                 user.object_name = compat_ptr(user32.object_name);
 660                         } else
 661 #endif
 662                         if (copy_from_user(&user, argp, sizeof(user)))
 663                                 return -EFAULT;
 664
 665                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 666                                 return -ENOMEM;
 667                         if (user.object_name_len) {
 668                                 newname = kmalloc(user.object_name_len, GFP_USER);
 669                                 if (!newname)
 670                                         return -ENOMEM;
 671                                 if (copy_from_user(newname, user.object_name, user.object_name_len)) {
 672                                         kfree(newname);
 673                                         return -EFAULT;
 674                                 }
 675                         } else {
 676                                 newname = NULL;
 677                         }
 678                         /* enter critical section */
 679                         /* maybe that kfree can sleep so do that this way */
 680                         /* it is at least more SMP friendly (in future...) */
 681                         oldname = server->auth.object_name;
 682                         oldnamelen = server->auth.object_name_len;
 683                         oldprivate = server->priv.data;
 684                         oldprivatelen = server->priv.len;
 685                         server->auth.auth_type = user.auth_type;
 686                         server->auth.object_name_len = user.object_name_len;
 687                         server->auth.object_name = newname;
 688                         server->priv.len = 0;
 689                         server->priv.data = NULL;
 690                         /* leave critical section */
 691                         kfree(oldprivate);
 692                         kfree(oldname);
 693                         return 0;
 694                 }
 695 #ifdef CONFIG_COMPAT
 696         case NCP_IOC_GETPRIVATEDATA_32:
 697 #endif
 698         case NCP_IOC_GETPRIVATEDATA:
 699                 if (current->uid != server->m.mounted_uid) {
 700                         return -EACCES;
 701                 }
 702                 {
 703                         struct ncp_privatedata_ioctl user;
 704                         size_t outl;
 705
 706 #ifdef CONFIG_COMPAT
 707                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 708                                 struct compat_ncp_privatedata_ioctl user32;
 709                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 710                                         return -EFAULT;
 711                                 user.len = user32.len;
 712                                 user.data = compat_ptr(user32.data);
 713                         } else
 714 #endif
 715                         if (copy_from_user(&user, argp, sizeof(user)))
 716                                 return -EFAULT;
 717
 718                         outl = user.len;
 719                         user.len = server->priv.len;
 720                         if (outl > user.len) outl = user.len;
 721                         if (outl) {
 722                                 if (copy_to_user(user.data,
 723                                                  server->priv.data,
 724                                                  outl)) return -EFAULT;
 725                         }
 726 #ifdef CONFIG_COMPAT
 727                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 728                                 struct compat_ncp_privatedata_ioctl user32;
 729                                 user32.len = user.len;
 730                                 user32.data = (unsigned long) user.data;
 731                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 732                                         return -EFAULT;
 733                         } else
 734 #endif
 735                         if (copy_to_user(argp, &user, sizeof(user)))
 736                                 return -EFAULT;
 737
 738                         return 0;
 739                 }
 740 #ifdef CONFIG_COMPAT
 741         case NCP_IOC_SETPRIVATEDATA_32:
 742 #endif
 743         case NCP_IOC_SETPRIVATEDATA:
 744                 if (current->uid != server->m.mounted_uid) {
 745                         return -EACCES;
 746                 }
 747                 {
 748                         struct ncp_privatedata_ioctl user;
 749                         void* new;
 750                         void* old;
 751                         size_t oldlen;
 752
 753 #ifdef CONFIG_COMPAT
 754                         if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
 755                                 struct compat_ncp_privatedata_ioctl user32;
 756                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 757                                         return -EFAULT;
 758                                 user.len = user32.len;
 759                                 user.data = compat_ptr(user32.data);
 760                         } else
 761 #endif
 762                         if (copy_from_user(&user, argp, sizeof(user)))
 763                                 return -EFAULT;
 764
 765                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 766                                 return -ENOMEM;
 767                         if (user.len) {
 768                                 new = kmalloc(user.len, GFP_USER);
 769                                 if (!new)
 770                                         return -ENOMEM;
 771                                 if (copy_from_user(new, user.data, user.len)) {
 772                                         kfree(new);
 773                                         return -EFAULT;
 774                                 }
 775                         } else {
 776                                 new = NULL;
 777                         }
 778                         /* enter critical section */
 779                         old = server->priv.data;
 780                         oldlen = server->priv.len;
 781                         server->priv.len = user.len;
 782                         server->priv.data = new;
 783                         /* leave critical section */
 784                         kfree(old);
 785                         return 0;
 786                 }
 787
 788 #ifdef CONFIG_NCPFS_NLS
 789         case NCP_IOC_SETCHARSETS:
 790                 return ncp_set_charsets(server, argp);
 791
 792         case NCP_IOC_GETCHARSETS:
 793                 return ncp_get_charsets(server, argp);
 794
 795 #endif /* CONFIG_NCPFS_NLS */
 796
 797         case NCP_IOC_SETDENTRYTTL:
 798                 if ((file_permission(filp, MAY_WRITE) != 0) &&
 799                                  (current->uid != server->m.mounted_uid))
 800                         return -EACCES;
 801                 {
 802                         u_int32_t user;
 803
 804                         if (copy_from_user(&user, argp, sizeof(user)))
 805                                 return -EFAULT;
 806                         /* 20 secs at most... */
 807                         if (user > 20000)
 808                                 return -EINVAL;
 809                         user = (user * HZ) / 1000;
 810                         server->dentry_ttl = user;
 811                         return 0;
 812                 }
 813
 814         case NCP_IOC_GETDENTRYTTL:
 815                 {
 816                         u_int32_t user = (server->dentry_ttl * 1000) / HZ;
 817                         if (copy_to_user(argp, &user, sizeof(user)))
 818                                 return -EFAULT;
 819                         return 0;
 820                 }
 821
 822         }
 823         return -EINVAL;
 824 }
 825
 826 static int ncp_ioctl_need_write(unsigned int cmd)
 827 {
 828         switch (cmd) {
 829         case NCP_IOC_GET_FS_INFO:
 830         case NCP_IOC_GET_FS_INFO_V2:
 831         case NCP_IOC_NCPREQUEST:
 832         case NCP_IOC_SETDENTRYTTL:
 833         case NCP_IOC_SIGN_INIT:
 834         case NCP_IOC_LOCKUNLOCK:
 835         case NCP_IOC_SET_SIGN_WANTED:
 836                 return 1;
 837         case NCP_IOC_GETOBJECTNAME:
 838         case NCP_IOC_SETOBJECTNAME:
 839         case NCP_IOC_GETPRIVATEDATA:
 840         case NCP_IOC_SETPRIVATEDATA:
 841         case NCP_IOC_SETCHARSETS:
 842         case NCP_IOC_GETCHARSETS:
 843         case NCP_IOC_CONN_LOGGED_IN:
 844         case NCP_IOC_GETDENTRYTTL:
 845         case NCP_IOC_GETMOUNTUID2:
 846         case NCP_IOC_SIGN_WANTED:
 847         case NCP_IOC_GETROOT:
 848         case NCP_IOC_SETROOT:
 849                 return 0;
 850         default:
 851                 /* unkown IOCTL command, assume write */
 852                 return 1;
 853         }
 854 }
 855
 856 int ncp_ioctl(struct inode *inode, struct file *filp,
 857               unsigned int cmd, unsigned long arg)
 858 {
 859         int ret;
 860
 861         if (ncp_ioctl_need_write(cmd)) {
 862                 /*
 863                  * inside the ioctl(), any failures which
 864                  * are because of file_permission() are
 865                  * -EACCESS, so it seems consistent to keep
 866                  *  that here.
 867                  */
 868                 if (mnt_want_write(filp->f_path.mnt))
 869                         return -EACCES;
 870         }
 871         ret = __ncp_ioctl(inode, filp, cmd, arg);
 872         if (ncp_ioctl_need_write(cmd))
 873                 mnt_drop_write(filp->f_path.mnt);
 874         return ret;
 875 }
 876
 877 #ifdef CONFIG_COMPAT
 878 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 879 {
 880         struct inode *inode = file->f_path.dentry->d_inode;
 881         int ret;
 882
 883         lock_kernel();
 884         arg = (unsigned long) compat_ptr(arg);
 885         ret = ncp_ioctl(inode, file, cmd, arg);
 886         unlock_kernel();
 887         return ret;
 888 }
 889 #endif