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   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;    /* a 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         unload_nls(oldset_cp);
 227         unload_nls(oldset_io);
 228
 229         return 0;
 230 }
 231
 232 static int
 233 ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 234 {
 235         struct ncp_nls_ioctl user;
 236         int len;
 237
 238         memset(&user, 0, sizeof(user));
 239         if (server->nls_vol && server->nls_vol->charset) {
 240                 len = strlen(server->nls_vol->charset);
 241                 if (len > NCP_IOCSNAME_LEN)
 242                         len = NCP_IOCSNAME_LEN;
 243                 strncpy(user.codepage, server->nls_vol->charset, len);
 244                 user.codepage[len] = 0;
 245         }
 246
 247         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 248                 strcpy(user.iocharset, "utf8");
 249         else if (server->nls_io && server->nls_io->charset) {
 250                 len = strlen(server->nls_io->charset);
 251                 if (len > NCP_IOCSNAME_LEN)
 252                         len = NCP_IOCSNAME_LEN;
 253                 strncpy(user.iocharset, server->nls_io->charset, len);
 254                 user.iocharset[len] = 0;
 255         }
 256
 257         if (copy_to_user(arg, &user, sizeof(user)))
 258                 return -EFAULT;
 259         return 0;
 260 }
 261 #endif /* CONFIG_NCPFS_NLS */
 262
 263 static int __ncp_ioctl(struct inode *inode, struct file *filp,
 264               unsigned int cmd, unsigned long arg)
 265 {
 266         struct ncp_server *server = NCP_SERVER(inode);
 267         int result;
 268         struct ncp_ioctl_request request;
 269         char* bouncebuffer;
 270         void __user *argp = (void __user *)arg;
 271         uid_t uid = current_uid();
 272
 273         switch (cmd) {
 274 #ifdef CONFIG_COMPAT
 275         case NCP_IOC_NCPREQUEST_32:
 276 #endif
 277         case NCP_IOC_NCPREQUEST:
 278                 if (file_permission(filp, MAY_WRITE) != 0
 279                     && uid != server->m.mounted_uid)
 280                         return -EACCES;
 281
 282 #ifdef CONFIG_COMPAT
 283                 if (cmd == NCP_IOC_NCPREQUEST_32) {
 284                         struct compat_ncp_ioctl_request request32;
 285                         if (copy_from_user(&request32, argp, sizeof(request32)))
 286                                 return -EFAULT;
 287                         request.function = request32.function;
 288                         request.size = request32.size;
 289                         request.data = compat_ptr(request32.data);
 290                 } else
 291 #endif
 292                 if (copy_from_user(&request, argp, sizeof(request)))
 293                         return -EFAULT;
 294
 295                 if ((request.function > 255)
 296                     || (request.size >
 297                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
 298                         return -EINVAL;
 299                 }
 300                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
 301                 if (!bouncebuffer)
 302                         return -ENOMEM;
 303                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
 304                         vfree(bouncebuffer);
 305                         return -EFAULT;
 306                 }
 307                 ncp_lock_server(server);
 308
 309                 /* FIXME: We hack around in the server's structures
 310                    here to be able to use ncp_request */
 311
 312                 server->has_subfunction = 0;
 313                 server->current_size = request.size;
 314                 memcpy(server->packet, bouncebuffer, request.size);
 315
 316                 result = ncp_request2(server, request.function,
 317                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
 318                 if (result < 0)
 319                         result = -EIO;
 320                 else
 321                         result = server->reply_size;
 322                 ncp_unlock_server(server);
 323                 DPRINTK("ncp_ioctl: copy %d bytes\n",
 324                         result);
 325                 if (result >= 0)
 326                         if (copy_to_user(request.data, bouncebuffer, result))
 327                                 result = -EFAULT;
 328                 vfree(bouncebuffer);
 329                 return result;
 330
 331         case NCP_IOC_CONN_LOGGED_IN:
 332
 333                 if (!capable(CAP_SYS_ADMIN))
 334                         return -EACCES;
 335                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
 336                         return -EINVAL;
 337                 if (server->root_setuped)
 338                         return -EBUSY;
 339                 server->root_setuped = 1;
 340                 return ncp_conn_logged_in(inode->i_sb);
 341
 342         case NCP_IOC_GET_FS_INFO:
 343                 return ncp_get_fs_info(server, filp, argp);
 344
 345         case NCP_IOC_GET_FS_INFO_V2:
 346                 return ncp_get_fs_info_v2(server, filp, argp);
 347
 348 #ifdef CONFIG_COMPAT
 349         case NCP_IOC_GET_FS_INFO_V2_32:
 350                 return ncp_get_compat_fs_info_v2(server, filp, argp);
 351 #endif
 352         /* we have too many combinations of CONFIG_COMPAT,
 353          * CONFIG_64BIT and CONFIG_UID16, so just handle
 354          * any of the possible ioctls */
 355         case NCP_IOC_GETMOUNTUID16:
 356         case NCP_IOC_GETMOUNTUID32:
 357         case NCP_IOC_GETMOUNTUID64:
 358                 if (file_permission(filp, MAY_READ) != 0
 359                         && uid != server->m.mounted_uid)
 360                         return -EACCES;
 361
 362                 if (cmd == NCP_IOC_GETMOUNTUID16) {
 363                         u16 uid;
 364                         SET_UID(uid, server->m.mounted_uid);
 365                         if (put_user(uid, (u16 __user *)argp))
 366                                 return -EFAULT;
 367                 } else if (cmd == NCP_IOC_GETMOUNTUID32) {
 368                         if (put_user(server->m.mounted_uid,
 369                                                 (u32 __user *)argp))
 370                                 return -EFAULT;
 371                 } else {
 372                         if (put_user(server->m.mounted_uid,
 373                                                 (u64 __user *)argp))
 374                                 return -EFAULT;
 375                 }
 376                 return 0;
 377
 378         case NCP_IOC_GETROOT:
 379                 {
 380                         struct ncp_setroot_ioctl sr;
 381
 382                         if (file_permission(filp, MAY_READ) != 0
 383                             && uid != server->m.mounted_uid)
 384                                 return -EACCES;
 385
 386                         if (server->m.mounted_vol[0]) {
 387                                 struct dentry* dentry = inode->i_sb->s_root;
 388
 389                                 if (dentry) {
 390                                         struct inode* s_inode = dentry->d_inode;
 391
 392                                         if (s_inode) {
 393                                                 sr.volNumber = NCP_FINFO(s_inode)->volNumber;
 394                                                 sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
 395                                                 sr.namespace = server->name_space[sr.volNumber];
 396                                         } else
 397                                                 DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 398                                 } else
 399                                         DPRINTK("ncpfs: s_root==NULL\n");
 400                         } else {
 401                                 sr.volNumber = -1;
 402                                 sr.namespace = 0;
 403                                 sr.dirEntNum = 0;
 404                         }
 405                         if (copy_to_user(argp, &sr, sizeof(sr)))
 406                                 return -EFAULT;
 407                         return 0;
 408                 }
 409
 410         case NCP_IOC_SETROOT:
 411                 {
 412                         struct ncp_setroot_ioctl sr;
 413                         __u32 vnum;
 414                         __le32 de;
 415                         __le32 dosde;
 416                         struct dentry* dentry;
 417
 418                         if (!capable(CAP_SYS_ADMIN))
 419                         {
 420                                 return -EACCES;
 421                         }
 422                         if (server->root_setuped) return -EBUSY;
 423                         if (copy_from_user(&sr, argp, sizeof(sr)))
 424                                 return -EFAULT;
 425                         if (sr.volNumber < 0) {
 426                                 server->m.mounted_vol[0] = 0;
 427                                 vnum = NCP_NUMBER_OF_VOLUMES;
 428                                 de = 0;
 429                                 dosde = 0;
 430                         } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 431                                 return -EINVAL;
 432                         } else if (ncp_mount_subdir(server, sr.volNumber,
 433                                                 sr.namespace, sr.dirEntNum,
 434                                                 &vnum, &de, &dosde)) {
 435                                 return -ENOENT;
 436                         }
 437
 438                         dentry = inode->i_sb->s_root;
 439                         server->root_setuped = 1;
 440                         if (dentry) {
 441                                 struct inode* s_inode = dentry->d_inode;
 442
 443                                 if (s_inode) {
 444                                         NCP_FINFO(s_inode)->volNumber = vnum;
 445                                         NCP_FINFO(s_inode)->dirEntNum = de;
 446                                         NCP_FINFO(s_inode)->DosDirNum = dosde;
 447                                 } else
 448                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 449                         } else
 450                                 DPRINTK("ncpfs: s_root==NULL\n");
 451
 452                         return 0;
 453                 }
 454
 455 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 456         case NCP_IOC_SIGN_INIT:
 457                 if (file_permission(filp, MAY_WRITE) != 0
 458                     && uid != server->m.mounted_uid)
 459                         return -EACCES;
 460
 461                 if (argp) {
 462                         if (server->sign_wanted)
 463                         {
 464                                 struct ncp_sign_init sign;
 465
 466                                 if (copy_from_user(&sign, argp, sizeof(sign)))
 467                                         return -EFAULT;
 468                                 memcpy(server->sign_root,sign.sign_root,8);
 469                                 memcpy(server->sign_last,sign.sign_last,16);
 470                                 server->sign_active = 1;
 471                         }
 472                         /* ignore when signatures not wanted */
 473                 } else {
 474                         server->sign_active = 0;
 475                 }
 476                 return 0;
 477
 478         case NCP_IOC_SIGN_WANTED:
 479                 if (file_permission(filp, MAY_READ) != 0
 480                     && uid != server->m.mounted_uid)
 481                         return -EACCES;
 482
 483                 if (put_user(server->sign_wanted, (int __user *)argp))
 484                         return -EFAULT;
 485                 return 0;
 486
 487         case NCP_IOC_SET_SIGN_WANTED:
 488                 {
 489                         int newstate;
 490
 491                         if (file_permission(filp, MAY_WRITE) != 0
 492                             && uid != server->m.mounted_uid)
 493                                 return -EACCES;
 494
 495                         /* get only low 8 bits... */
 496                         if (get_user(newstate, (unsigned char __user *)argp))
 497                                 return -EFAULT;
 498                         if (server->sign_active) {
 499                                 /* cannot turn signatures OFF when active */
 500                                 if (!newstate) return -EINVAL;
 501                         } else {
 502                                 server->sign_wanted = newstate != 0;
 503                         }
 504                         return 0;
 505                 }
 506
 507 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 508
 509 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 510         case NCP_IOC_LOCKUNLOCK:
 511                 if (file_permission(filp, MAY_WRITE) != 0
 512                     && uid != server->m.mounted_uid)
 513                         return -EACCES;
 514
 515                 {
 516                         struct ncp_lock_ioctl    rqdata;
 517
 518                         if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
 519                                 return -EFAULT;
 520                         if (rqdata.origin != 0)
 521                                 return -EINVAL;
 522                         /* check for cmd */
 523                         switch (rqdata.cmd) {
 524                                 case NCP_LOCK_EX:
 525                                 case NCP_LOCK_SH:
 526                                                 if (rqdata.timeout == 0)
 527                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 528                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 529                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 530                                                 break;
 531                                 case NCP_LOCK_LOG:
 532                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 533                                 case NCP_LOCK_CLEAR:
 534                                                 break;
 535                                 default:
 536                                                 return -EINVAL;
 537                         }
 538                         /* locking needs both read and write access */
 539                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 540                         {
 541                                 return result;
 542                         }
 543                         result = -EIO;
 544                         if (!ncp_conn_valid(server))
 545                                 goto outrel;
 546                         result = -EISDIR;
 547                         if (!S_ISREG(inode->i_mode))
 548                                 goto outrel;
 549                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 550                         {
 551                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 552                                                         NCP_FINFO(inode)->file_handle,
 553                                                         rqdata.offset,
 554                                                         rqdata.length);
 555                                 if (result > 0) result = 0;     /* no such lock */
 556                         }
 557                         else
 558                         {
 559                                 int lockcmd;
 560
 561                                 switch (rqdata.cmd)
 562                                 {
 563                                         case NCP_LOCK_EX:  lockcmd=1; break;
 564                                         case NCP_LOCK_SH:  lockcmd=3; break;
 565                                         default:           lockcmd=0; break;
 566                                 }
 567                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 568                                                         NCP_FINFO(inode)->file_handle,
 569                                                         lockcmd,
 570                                                         rqdata.offset,
 571                                                         rqdata.length,
 572                                                         rqdata.timeout);
 573                                 if (result > 0) result = -EAGAIN;
 574                         }
 575 outrel:
 576                         ncp_inode_close(inode);
 577                         return result;
 578                 }
 579 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 580
 581 #ifdef CONFIG_COMPAT
 582         case NCP_IOC_GETOBJECTNAME_32:
 583                 if (uid != server->m.mounted_uid)
 584                         return -EACCES;
 585                 {
 586                         struct compat_ncp_objectname_ioctl user;
 587                         size_t outl;
 588
 589                         if (copy_from_user(&user, argp, sizeof(user)))
 590                                 return -EFAULT;
 591                         user.auth_type = server->auth.auth_type;
 592                         outl = user.object_name_len;
 593                         user.object_name_len = server->auth.object_name_len;
 594                         if (outl > user.object_name_len)
 595                                 outl = user.object_name_len;
 596                         if (outl) {
 597                                 if (copy_to_user(compat_ptr(user.object_name),
 598                                                  server->auth.object_name,
 599                                                  outl)) return -EFAULT;
 600                         }
 601                         if (copy_to_user(argp, &user, sizeof(user)))
 602                                 return -EFAULT;
 603                         return 0;
 604                 }
 605 #endif
 606
 607         case NCP_IOC_GETOBJECTNAME:
 608                 if (uid != server->m.mounted_uid)
 609                         return -EACCES;
 610                 {
 611                         struct ncp_objectname_ioctl user;
 612                         size_t outl;
 613
 614                         if (copy_from_user(&user, argp, sizeof(user)))
 615                                 return -EFAULT;
 616                         user.auth_type = server->auth.auth_type;
 617                         outl = user.object_name_len;
 618                         user.object_name_len = server->auth.object_name_len;
 619                         if (outl > user.object_name_len)
 620                                 outl = user.object_name_len;
 621                         if (outl) {
 622                                 if (copy_to_user(user.object_name,
 623                                                  server->auth.object_name,
 624                                                  outl)) return -EFAULT;
 625                         }
 626                         if (copy_to_user(argp, &user, sizeof(user)))
 627                                 return -EFAULT;
 628                         return 0;
 629                 }
 630
 631 #ifdef CONFIG_COMPAT
 632         case NCP_IOC_SETOBJECTNAME_32:
 633 #endif
 634         case NCP_IOC_SETOBJECTNAME:
 635                 if (uid != server->m.mounted_uid)
 636                         return -EACCES;
 637                 {
 638                         struct ncp_objectname_ioctl user;
 639                         void* newname;
 640                         void* oldname;
 641                         size_t oldnamelen;
 642                         void* oldprivate;
 643                         size_t oldprivatelen;
 644
 645 #ifdef CONFIG_COMPAT
 646                         if (cmd == NCP_IOC_SETOBJECTNAME_32) {
 647                                 struct compat_ncp_objectname_ioctl user32;
 648                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 649                                         return -EFAULT;
 650                                 user.auth_type = user32.auth_type;
 651                                 user.object_name_len = user32.object_name_len;
 652                                 user.object_name = compat_ptr(user32.object_name);
 653                         } else
 654 #endif
 655                         if (copy_from_user(&user, argp, sizeof(user)))
 656                                 return -EFAULT;
 657
 658                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 659                                 return -ENOMEM;
 660                         if (user.object_name_len) {
 661                                 newname = memdup_user(user.object_name,
 662                                                       user.object_name_len);
 663                                 if (IS_ERR(newname))
 664                                         return PTR_ERR(newname);
 665                         } else {
 666                                 newname = NULL;
 667                         }
 668                         /* enter critical section */
 669                         /* maybe that kfree can sleep so do that this way */
 670                         /* it is at least more SMP friendly (in future...) */
 671                         oldname = server->auth.object_name;
 672                         oldnamelen = server->auth.object_name_len;
 673                         oldprivate = server->priv.data;
 674                         oldprivatelen = server->priv.len;
 675                         server->auth.auth_type = user.auth_type;
 676                         server->auth.object_name_len = user.object_name_len;
 677                         server->auth.object_name = newname;
 678                         server->priv.len = 0;
 679                         server->priv.data = NULL;
 680                         /* leave critical section */
 681                         kfree(oldprivate);
 682                         kfree(oldname);
 683                         return 0;
 684                 }
 685
 686 #ifdef CONFIG_COMPAT
 687         case NCP_IOC_GETPRIVATEDATA_32:
 688 #endif
 689         case NCP_IOC_GETPRIVATEDATA:
 690                 if (uid != server->m.mounted_uid)
 691                         return -EACCES;
 692                 {
 693                         struct ncp_privatedata_ioctl user;
 694                         size_t outl;
 695
 696 #ifdef CONFIG_COMPAT
 697                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 698                                 struct compat_ncp_privatedata_ioctl user32;
 699                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 700                                         return -EFAULT;
 701                                 user.len = user32.len;
 702                                 user.data = compat_ptr(user32.data);
 703                         } else
 704 #endif
 705                         if (copy_from_user(&user, argp, sizeof(user)))
 706                                 return -EFAULT;
 707
 708                         outl = user.len;
 709                         user.len = server->priv.len;
 710                         if (outl > user.len) outl = user.len;
 711                         if (outl) {
 712                                 if (copy_to_user(user.data,
 713                                                  server->priv.data,
 714                                                  outl)) return -EFAULT;
 715                         }
 716 #ifdef CONFIG_COMPAT
 717                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 718                                 struct compat_ncp_privatedata_ioctl user32;
 719                                 user32.len = user.len;
 720                                 user32.data = (unsigned long) user.data;
 721                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 722                                         return -EFAULT;
 723                         } else
 724 #endif
 725                         if (copy_to_user(argp, &user, sizeof(user)))
 726                                 return -EFAULT;
 727
 728                         return 0;
 729                 }
 730
 731 #ifdef CONFIG_COMPAT
 732         case NCP_IOC_SETPRIVATEDATA_32:
 733 #endif
 734         case NCP_IOC_SETPRIVATEDATA:
 735                 if (uid != server->m.mounted_uid)
 736                         return -EACCES;
 737                 {
 738                         struct ncp_privatedata_ioctl user;
 739                         void* new;
 740                         void* old;
 741                         size_t oldlen;
 742
 743 #ifdef CONFIG_COMPAT
 744                         if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
 745                                 struct compat_ncp_privatedata_ioctl user32;
 746                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 747                                         return -EFAULT;
 748                                 user.len = user32.len;
 749                                 user.data = compat_ptr(user32.data);
 750                         } else
 751 #endif
 752                         if (copy_from_user(&user, argp, sizeof(user)))
 753                                 return -EFAULT;
 754
 755                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 756                                 return -ENOMEM;
 757                         if (user.len) {
 758                                 new = memdup_user(user.data, user.len);
 759                                 if (IS_ERR(new))
 760                                         return PTR_ERR(new);
 761                         } else {
 762                                 new = NULL;
 763                         }
 764                         /* enter critical section */
 765                         old = server->priv.data;
 766                         oldlen = server->priv.len;
 767                         server->priv.len = user.len;
 768                         server->priv.data = new;
 769                         /* leave critical section */
 770                         kfree(old);
 771                         return 0;
 772                 }
 773
 774 #ifdef CONFIG_NCPFS_NLS
 775         case NCP_IOC_SETCHARSETS:
 776                 return ncp_set_charsets(server, argp);
 777
 778         case NCP_IOC_GETCHARSETS:
 779                 return ncp_get_charsets(server, argp);
 780
 781 #endif /* CONFIG_NCPFS_NLS */
 782
 783         case NCP_IOC_SETDENTRYTTL:
 784                 if (file_permission(filp, MAY_WRITE) != 0 &&
 785                     uid != server->m.mounted_uid)
 786                         return -EACCES;
 787
 788                 {
 789                         u_int32_t user;
 790
 791                         if (copy_from_user(&user, argp, sizeof(user)))
 792                                 return -EFAULT;
 793                         /* 20 secs at most... */
 794                         if (user > 20000)
 795                                 return -EINVAL;
 796                         user = (user * HZ) / 1000;
 797                         server->dentry_ttl = user;
 798                         return 0;
 799                 }
 800
 801         case NCP_IOC_GETDENTRYTTL:
 802                 {
 803                         u_int32_t user = (server->dentry_ttl * 1000) / HZ;
 804                         if (copy_to_user(argp, &user, sizeof(user)))
 805                                 return -EFAULT;
 806                         return 0;
 807                 }
 808
 809         }
 810         return -EINVAL;
 811 }
 812
 813 static int ncp_ioctl_need_write(unsigned int cmd)
 814 {
 815         switch (cmd) {
 816         case NCP_IOC_GET_FS_INFO:
 817         case NCP_IOC_GET_FS_INFO_V2:
 818         case NCP_IOC_NCPREQUEST:
 819         case NCP_IOC_SETDENTRYTTL:
 820         case NCP_IOC_SIGN_INIT:
 821         case NCP_IOC_LOCKUNLOCK:
 822         case NCP_IOC_SET_SIGN_WANTED:
 823                 return 1;
 824         case NCP_IOC_GETOBJECTNAME:
 825         case NCP_IOC_SETOBJECTNAME:
 826         case NCP_IOC_GETPRIVATEDATA:
 827         case NCP_IOC_SETPRIVATEDATA:
 828         case NCP_IOC_SETCHARSETS:
 829         case NCP_IOC_GETCHARSETS:
 830         case NCP_IOC_CONN_LOGGED_IN:
 831         case NCP_IOC_GETDENTRYTTL:
 832         case NCP_IOC_GETMOUNTUID2:
 833         case NCP_IOC_SIGN_WANTED:
 834         case NCP_IOC_GETROOT:
 835         case NCP_IOC_SETROOT:
 836                 return 0;
 837         default:
 838                 /* unknown IOCTL command, assume write */
 839                 return 1;
 840         }
 841 }
 842
 843 int ncp_ioctl(struct inode *inode, struct file *filp,
 844               unsigned int cmd, unsigned long arg)
 845 {
 846         int ret;
 847
 848         if (ncp_ioctl_need_write(cmd)) {
 849                 /*
 850                  * inside the ioctl(), any failures which
 851                  * are because of file_permission() are
 852                  * -EACCESS, so it seems consistent to keep
 853                  *  that here.
 854                  */
 855                 if (mnt_want_write(filp->f_path.mnt))
 856                         return -EACCES;
 857         }
 858         ret = __ncp_ioctl(inode, filp, cmd, arg);
 859         if (ncp_ioctl_need_write(cmd))
 860                 mnt_drop_write(filp->f_path.mnt);
 861         return ret;
 862 }
 863
 864 #ifdef CONFIG_COMPAT
 865 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 866 {
 867         struct inode *inode = file->f_path.dentry->d_inode;
 868         int ret;
 869
 870         lock_kernel();
 871         arg = (unsigned long) compat_ptr(arg);
 872         ret = ncp_ioctl(inode, file, cmd, arg);
 873         unlock_kernel();
 874         return ret;
 875 }
 876 #endif