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/slab.h>
  19 #include <linux/highuid.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/sched.h>
  22
  23 #include <asm/uaccess.h>
  24
  25 #include "ncp_fs.h"
  26
  27 /* maximum limit for ncp_objectname_ioctl */
  28 #define NCP_OBJECT_NAME_MAX_LEN 4096
  29 /* maximum limit for ncp_privatedata_ioctl */
  30 #define NCP_PRIVATE_DATA_MAX_LEN 8192
  31 /* maximum negotiable packet size */
  32 #define NCP_PACKET_SIZE_INTERNAL 65536
  33
  34 static int
  35 ncp_get_fs_info(struct ncp_server * server, struct inode *inode,
  36                 struct ncp_fs_info __user *arg)
  37 {
  38         struct ncp_fs_info info;
  39
  40         if (copy_from_user(&info, arg, sizeof(info)))
  41                 return -EFAULT;
  42
  43         if (info.version != NCP_GET_FS_INFO_VERSION) {
  44                 ncp_dbg(1, "info.version invalid: %d\n", info.version);
  45                 return -EINVAL;
  46         }
  47         /* TODO: info.addr = server->m.serv_addr; */
  48         SET_UID(info.mounted_uid, from_kuid_munged(current_user_ns(), server->m.mounted_uid));
  49         info.connection         = server->connection;
  50         info.buffer_size        = server->buffer_size;
  51         info.volume_number      = NCP_FINFO(inode)->volNumber;
  52         info.directory_id       = NCP_FINFO(inode)->DosDirNum;
  53
  54         if (copy_to_user(arg, &info, sizeof(info)))
  55                 return -EFAULT;
  56         return 0;
  57 }
  58
  59 static int
  60 ncp_get_fs_info_v2(struct ncp_server * server, struct inode *inode,
  61                    struct ncp_fs_info_v2 __user * arg)
  62 {
  63         struct ncp_fs_info_v2 info2;
  64
  65         if (copy_from_user(&info2, arg, sizeof(info2)))
  66                 return -EFAULT;
  67
  68         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
  69                 ncp_dbg(1, "info.version invalid: %d\n", info2.version);
  70                 return -EINVAL;
  71         }
  72         info2.mounted_uid   = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
  73         info2.connection    = server->connection;
  74         info2.buffer_size   = server->buffer_size;
  75         info2.volume_number = NCP_FINFO(inode)->volNumber;
  76         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
  77         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
  78
  79         if (copy_to_user(arg, &info2, sizeof(info2)))
  80                 return -EFAULT;
  81         return 0;
  82 }
  83
  84 #ifdef CONFIG_COMPAT
  85 struct compat_ncp_objectname_ioctl
  86 {
  87         s32             auth_type;
  88         u32             object_name_len;
  89         compat_caddr_t  object_name;    /* a userspace data, in most cases user name */
  90 };
  91
  92 struct compat_ncp_fs_info_v2 {
  93         s32 version;
  94         u32 mounted_uid;
  95         u32 connection;
  96         u32 buffer_size;
  97
  98         u32 volume_number;
  99         u32 directory_id;
 100
 101         u32 dummy1;
 102         u32 dummy2;
 103         u32 dummy3;
 104 };
 105
 106 struct compat_ncp_ioctl_request {
 107         u32 function;
 108         u32 size;
 109         compat_caddr_t data;
 110 };
 111
 112 struct compat_ncp_privatedata_ioctl
 113 {
 114         u32             len;
 115         compat_caddr_t  data;           /* ~1000 for NDS */
 116 };
 117
 118 #define NCP_IOC_GET_FS_INFO_V2_32       _IOWR('n', 4, struct compat_ncp_fs_info_v2)
 119 #define NCP_IOC_NCPREQUEST_32           _IOR('n', 1, struct compat_ncp_ioctl_request)
 120 #define NCP_IOC_GETOBJECTNAME_32        _IOWR('n', 9, struct compat_ncp_objectname_ioctl)
 121 #define NCP_IOC_SETOBJECTNAME_32        _IOR('n', 9, struct compat_ncp_objectname_ioctl)
 122 #define NCP_IOC_GETPRIVATEDATA_32       _IOWR('n', 10, struct compat_ncp_privatedata_ioctl)
 123 #define NCP_IOC_SETPRIVATEDATA_32       _IOR('n', 10, struct compat_ncp_privatedata_ioctl)
 124
 125 static int
 126 ncp_get_compat_fs_info_v2(struct ncp_server * server, struct inode *inode,
 127                    struct compat_ncp_fs_info_v2 __user * arg)
 128 {
 129         struct compat_ncp_fs_info_v2 info2;
 130
 131         if (copy_from_user(&info2, arg, sizeof(info2)))
 132                 return -EFAULT;
 133
 134         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
 135                 ncp_dbg(1, "info.version invalid: %d\n", info2.version);
 136                 return -EINVAL;
 137         }
 138         info2.mounted_uid   = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 139         info2.connection    = server->connection;
 140         info2.buffer_size   = server->buffer_size;
 141         info2.volume_number = NCP_FINFO(inode)->volNumber;
 142         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
 143         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
 144
 145         if (copy_to_user(arg, &info2, sizeof(info2)))
 146                 return -EFAULT;
 147         return 0;
 148 }
 149 #endif
 150
 151 #define NCP_IOC_GETMOUNTUID16           _IOW('n', 2, u16)
 152 #define NCP_IOC_GETMOUNTUID32           _IOW('n', 2, u32)
 153 #define NCP_IOC_GETMOUNTUID64           _IOW('n', 2, u64)
 154
 155 #ifdef CONFIG_NCPFS_NLS
 156 /* Here we are select the iocharset and the codepage for NLS.
 157  * Thanks Petr Vandrovec for idea and many hints.
 158  */
 159 static int
 160 ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 161 {
 162         struct ncp_nls_ioctl user;
 163         struct nls_table *codepage;
 164         struct nls_table *iocharset;
 165         struct nls_table *oldset_io;
 166         struct nls_table *oldset_cp;
 167         int utf8;
 168         int err;
 169
 170         if (copy_from_user(&user, arg, sizeof(user)))
 171                 return -EFAULT;
 172
 173         codepage = NULL;
 174         user.codepage[NCP_IOCSNAME_LEN] = 0;
 175         if (!user.codepage[0] || !strcmp(user.codepage, "default"))
 176                 codepage = load_nls_default();
 177         else {
 178                 codepage = load_nls(user.codepage);
 179                 if (!codepage) {
 180                         return -EBADRQC;
 181                 }
 182         }
 183
 184         iocharset = NULL;
 185         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 186         if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
 187                 iocharset = load_nls_default();
 188                 utf8 = 0;
 189         } else if (!strcmp(user.iocharset, "utf8")) {
 190                 iocharset = load_nls_default();
 191                 utf8 = 1;
 192         } else {
 193                 iocharset = load_nls(user.iocharset);
 194                 if (!iocharset) {
 195                         unload_nls(codepage);
 196                         return -EBADRQC;
 197                 }
 198                 utf8 = 0;
 199         }
 200
 201         mutex_lock(&server->root_setup_lock);
 202         if (server->root_setuped) {
 203                 oldset_cp = codepage;
 204                 oldset_io = iocharset;
 205                 err = -EBUSY;
 206         } else {
 207                 if (utf8)
 208                         NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 209                 else
 210                         NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 211                 oldset_cp = server->nls_vol;
 212                 server->nls_vol = codepage;
 213                 oldset_io = server->nls_io;
 214                 server->nls_io = iocharset;
 215                 err = 0;
 216         }
 217         mutex_unlock(&server->root_setup_lock);
 218         unload_nls(oldset_cp);
 219         unload_nls(oldset_io);
 220
 221         return err;
 222 }
 223
 224 static int
 225 ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 226 {
 227         struct ncp_nls_ioctl user;
 228         int len;
 229
 230         memset(&user, 0, sizeof(user));
 231         mutex_lock(&server->root_setup_lock);
 232         if (server->nls_vol && server->nls_vol->charset) {
 233                 len = strlen(server->nls_vol->charset);
 234                 if (len > NCP_IOCSNAME_LEN)
 235                         len = NCP_IOCSNAME_LEN;
 236                 strncpy(user.codepage, server->nls_vol->charset, len);
 237                 user.codepage[len] = 0;
 238         }
 239
 240         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 241                 strcpy(user.iocharset, "utf8");
 242         else if (server->nls_io && server->nls_io->charset) {
 243                 len = strlen(server->nls_io->charset);
 244                 if (len > NCP_IOCSNAME_LEN)
 245                         len = NCP_IOCSNAME_LEN;
 246                 strncpy(user.iocharset, server->nls_io->charset, len);
 247                 user.iocharset[len] = 0;
 248         }
 249         mutex_unlock(&server->root_setup_lock);
 250
 251         if (copy_to_user(arg, &user, sizeof(user)))
 252                 return -EFAULT;
 253         return 0;
 254 }
 255 #endif /* CONFIG_NCPFS_NLS */
 256
 257 static long __ncp_ioctl(struct inode *inode, unsigned int cmd, unsigned long arg)
 258 {
 259         struct ncp_server *server = NCP_SERVER(inode);
 260         int result;
 261         struct ncp_ioctl_request request;
 262         char* bouncebuffer;
 263         void __user *argp = (void __user *)arg;
 264
 265         switch (cmd) {
 266 #ifdef CONFIG_COMPAT
 267         case NCP_IOC_NCPREQUEST_32:
 268 #endif
 269         case NCP_IOC_NCPREQUEST:
 270 #ifdef CONFIG_COMPAT
 271                 if (cmd == NCP_IOC_NCPREQUEST_32) {
 272                         struct compat_ncp_ioctl_request request32;
 273                         if (copy_from_user(&request32, argp, sizeof(request32)))
 274                                 return -EFAULT;
 275                         request.function = request32.function;
 276                         request.size = request32.size;
 277                         request.data = compat_ptr(request32.data);
 278                 } else
 279 #endif
 280                 if (copy_from_user(&request, argp, sizeof(request)))
 281                         return -EFAULT;
 282
 283                 if ((request.function > 255)
 284                     || (request.size >
 285                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
 286                         return -EINVAL;
 287                 }
 288                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
 289                 if (!bouncebuffer)
 290                         return -ENOMEM;
 291                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
 292                         vfree(bouncebuffer);
 293                         return -EFAULT;
 294                 }
 295                 ncp_lock_server(server);
 296
 297                 /* FIXME: We hack around in the server's structures
 298                    here to be able to use ncp_request */
 299
 300                 server->has_subfunction = 0;
 301                 server->current_size = request.size;
 302                 memcpy(server->packet, bouncebuffer, request.size);
 303
 304                 result = ncp_request2(server, request.function,
 305                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
 306                 if (result < 0)
 307                         result = -EIO;
 308                 else
 309                         result = server->reply_size;
 310                 ncp_unlock_server(server);
 311                 ncp_dbg(1, "copy %d bytes\n", result);
 312                 if (result >= 0)
 313                         if (copy_to_user(request.data, bouncebuffer, result))
 314                                 result = -EFAULT;
 315                 vfree(bouncebuffer);
 316                 return result;
 317
 318         case NCP_IOC_CONN_LOGGED_IN:
 319
 320                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
 321                         return -EINVAL;
 322                 mutex_lock(&server->root_setup_lock);
 323                 if (server->root_setuped)
 324                         result = -EBUSY;
 325                 else {
 326                         result = ncp_conn_logged_in(inode->i_sb);
 327                         if (result == 0)
 328                                 server->root_setuped = 1;
 329                 }
 330                 mutex_unlock(&server->root_setup_lock);
 331                 return result;
 332
 333         case NCP_IOC_GET_FS_INFO:
 334                 return ncp_get_fs_info(server, inode, argp);
 335
 336         case NCP_IOC_GET_FS_INFO_V2:
 337                 return ncp_get_fs_info_v2(server, inode, argp);
 338
 339 #ifdef CONFIG_COMPAT
 340         case NCP_IOC_GET_FS_INFO_V2_32:
 341                 return ncp_get_compat_fs_info_v2(server, inode, argp);
 342 #endif
 343         /* we have too many combinations of CONFIG_COMPAT,
 344          * CONFIG_64BIT and CONFIG_UID16, so just handle
 345          * any of the possible ioctls */
 346         case NCP_IOC_GETMOUNTUID16:
 347                 {
 348                         u16 uid;
 349
 350                         SET_UID(uid, from_kuid_munged(current_user_ns(), server->m.mounted_uid));
 351                         if (put_user(uid, (u16 __user *)argp))
 352                                 return -EFAULT;
 353                         return 0;
 354                 }
 355         case NCP_IOC_GETMOUNTUID32:
 356         {
 357                 uid_t uid = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 358                 if (put_user(uid, (u32 __user *)argp))
 359                         return -EFAULT;
 360                 return 0;
 361         }
 362         case NCP_IOC_GETMOUNTUID64:
 363         {
 364                 uid_t uid = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 365                 if (put_user(uid, (u64 __user *)argp))
 366                         return -EFAULT;
 367                 return 0;
 368         }
 369         case NCP_IOC_GETROOT:
 370                 {
 371                         struct ncp_setroot_ioctl sr;
 372
 373                         result = -EACCES;
 374                         mutex_lock(&server->root_setup_lock);
 375                         if (server->m.mounted_vol[0]) {
 376                                 struct dentry* dentry = inode->i_sb->s_root;
 377
 378                                 if (dentry) {
 379                                         struct inode* s_inode = dentry->d_inode;
 380
 381                                         if (s_inode) {
 382                                                 sr.volNumber = NCP_FINFO(s_inode)->volNumber;
 383                                                 sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
 384                                                 sr.namespace = server->name_space[sr.volNumber];
 385                                                 result = 0;
 386                                         } else
 387                                                 ncp_dbg(1, "s_root->d_inode==NULL\n");
 388                                 } else
 389                                         ncp_dbg(1, "s_root==NULL\n");
 390                         } else {
 391                                 sr.volNumber = -1;
 392                                 sr.namespace = 0;
 393                                 sr.dirEntNum = 0;
 394                                 result = 0;
 395                         }
 396                         mutex_unlock(&server->root_setup_lock);
 397                         if (!result && copy_to_user(argp, &sr, sizeof(sr)))
 398                                 result = -EFAULT;
 399                         return result;
 400                 }
 401
 402         case NCP_IOC_SETROOT:
 403                 {
 404                         struct ncp_setroot_ioctl sr;
 405                         __u32 vnum;
 406                         __le32 de;
 407                         __le32 dosde;
 408                         struct dentry* dentry;
 409
 410                         if (copy_from_user(&sr, argp, sizeof(sr)))
 411                                 return -EFAULT;
 412                         mutex_lock(&server->root_setup_lock);
 413                         if (server->root_setuped)
 414                                 result = -EBUSY;
 415                         else {
 416                                 if (sr.volNumber < 0) {
 417                                         server->m.mounted_vol[0] = 0;
 418                                         vnum = NCP_NUMBER_OF_VOLUMES;
 419                                         de = 0;
 420                                         dosde = 0;
 421                                         result = 0;
 422                                 } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 423                                         result = -EINVAL;
 424                                 } else if (ncp_mount_subdir(server, sr.volNumber,
 425                                                         sr.namespace, sr.dirEntNum,
 426                                                         &vnum, &de, &dosde)) {
 427                                         result = -ENOENT;
 428                                 } else
 429                                         result = 0;
 430
 431                                 if (result == 0) {
 432                                         dentry = inode->i_sb->s_root;
 433                                         if (dentry) {
 434                                                 struct inode* s_inode = dentry->d_inode;
 435
 436                                                 if (s_inode) {
 437                                                         NCP_FINFO(s_inode)->volNumber = vnum;
 438                                                         NCP_FINFO(s_inode)->dirEntNum = de;
 439                                                         NCP_FINFO(s_inode)->DosDirNum = dosde;
 440                                                         server->root_setuped = 1;
 441                                                 } else {
 442                                                         ncp_dbg(1, "s_root->d_inode==NULL\n");
 443                                                         result = -EIO;
 444                                                 }
 445                                         } else {
 446                                                 ncp_dbg(1, "s_root==NULL\n");
 447                                                 result = -EIO;
 448                                         }
 449                                 }
 450                                 result = 0;
 451                         }
 452                         mutex_unlock(&server->root_setup_lock);
 453
 454                         return result;
 455                 }
 456
 457 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 458         case NCP_IOC_SIGN_INIT:
 459                 {
 460                         struct ncp_sign_init sign;
 461
 462                         if (argp)
 463                                 if (copy_from_user(&sign, argp, sizeof(sign)))
 464                                         return -EFAULT;
 465                         ncp_lock_server(server);
 466                         mutex_lock(&server->rcv.creq_mutex);
 467                         if (argp) {
 468                                 if (server->sign_wanted) {
 469                                         memcpy(server->sign_root,sign.sign_root,8);
 470                                         memcpy(server->sign_last,sign.sign_last,16);
 471                                         server->sign_active = 1;
 472                                 }
 473                                 /* ignore when signatures not wanted */
 474                         } else {
 475                                 server->sign_active = 0;
 476                         }
 477                         mutex_unlock(&server->rcv.creq_mutex);
 478                         ncp_unlock_server(server);
 479                         return 0;
 480                 }
 481
 482         case NCP_IOC_SIGN_WANTED:
 483                 {
 484                         int state;
 485
 486                         ncp_lock_server(server);
 487                         state = server->sign_wanted;
 488                         ncp_unlock_server(server);
 489                         if (put_user(state, (int __user *)argp))
 490                                 return -EFAULT;
 491                         return 0;
 492                 }
 493
 494         case NCP_IOC_SET_SIGN_WANTED:
 495                 {
 496                         int newstate;
 497
 498                         /* get only low 8 bits... */
 499                         if (get_user(newstate, (unsigned char __user *)argp))
 500                                 return -EFAULT;
 501                         result = 0;
 502                         ncp_lock_server(server);
 503                         if (server->sign_active) {
 504                                 /* cannot turn signatures OFF when active */
 505                                 if (!newstate)
 506                                         result = -EINVAL;
 507                         } else {
 508                                 server->sign_wanted = newstate != 0;
 509                         }
 510                         ncp_unlock_server(server);
 511                         return result;
 512                 }
 513
 514 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 515
 516 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 517         case NCP_IOC_LOCKUNLOCK:
 518                 {
 519                         struct ncp_lock_ioctl    rqdata;
 520
 521                         if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
 522                                 return -EFAULT;
 523                         if (rqdata.origin != 0)
 524                                 return -EINVAL;
 525                         /* check for cmd */
 526                         switch (rqdata.cmd) {
 527                                 case NCP_LOCK_EX:
 528                                 case NCP_LOCK_SH:
 529                                                 if (rqdata.timeout == 0)
 530                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 531                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 532                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 533                                                 break;
 534                                 case NCP_LOCK_LOG:
 535                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 536                                 case NCP_LOCK_CLEAR:
 537                                                 break;
 538                                 default:
 539                                                 return -EINVAL;
 540                         }
 541                         /* locking needs both read and write access */
 542                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 543                         {
 544                                 return result;
 545                         }
 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                 {
 584                         struct compat_ncp_objectname_ioctl user;
 585                         size_t outl;
 586
 587                         if (copy_from_user(&user, argp, sizeof(user)))
 588                                 return -EFAULT;
 589                         down_read(&server->auth_rwsem);
 590                         user.auth_type = server->auth.auth_type;
 591                         outl = user.object_name_len;
 592                         user.object_name_len = server->auth.object_name_len;
 593                         if (outl > user.object_name_len)
 594                                 outl = user.object_name_len;
 595                         result = 0;
 596                         if (outl) {
 597                                 if (copy_to_user(compat_ptr(user.object_name),
 598                                                  server->auth.object_name,
 599                                                  outl))
 600                                         result = -EFAULT;
 601                         }
 602                         up_read(&server->auth_rwsem);
 603                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 604                                 result = -EFAULT;
 605                         return result;
 606                 }
 607 #endif
 608
 609         case NCP_IOC_GETOBJECTNAME:
 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                         down_read(&server->auth_rwsem);
 617                         user.auth_type = server->auth.auth_type;
 618                         outl = user.object_name_len;
 619                         user.object_name_len = server->auth.object_name_len;
 620                         if (outl > user.object_name_len)
 621                                 outl = user.object_name_len;
 622                         result = 0;
 623                         if (outl) {
 624                                 if (copy_to_user(user.object_name,
 625                                                  server->auth.object_name,
 626                                                  outl))
 627                                         result = -EFAULT;
 628                         }
 629                         up_read(&server->auth_rwsem);
 630                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 631                                 result = -EFAULT;
 632                         return result;
 633                 }
 634
 635 #ifdef CONFIG_COMPAT
 636         case NCP_IOC_SETOBJECTNAME_32:
 637 #endif
 638         case NCP_IOC_SETOBJECTNAME:
 639                 {
 640                         struct ncp_objectname_ioctl user;
 641                         void* newname;
 642                         void* oldname;
 643                         size_t oldnamelen;
 644                         void* oldprivate;
 645                         size_t oldprivatelen;
 646
 647 #ifdef CONFIG_COMPAT
 648                         if (cmd == NCP_IOC_SETOBJECTNAME_32) {
 649                                 struct compat_ncp_objectname_ioctl user32;
 650                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 651                                         return -EFAULT;
 652                                 user.auth_type = user32.auth_type;
 653                                 user.object_name_len = user32.object_name_len;
 654                                 user.object_name = compat_ptr(user32.object_name);
 655                         } else
 656 #endif
 657                         if (copy_from_user(&user, argp, sizeof(user)))
 658                                 return -EFAULT;
 659
 660                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 661                                 return -ENOMEM;
 662                         if (user.object_name_len) {
 663                                 newname = memdup_user(user.object_name,
 664                                                       user.object_name_len);
 665                                 if (IS_ERR(newname))
 666                                         return PTR_ERR(newname);
 667                         } else {
 668                                 newname = NULL;
 669                         }
 670                         down_write(&server->auth_rwsem);
 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                         up_write(&server->auth_rwsem);
 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                 {
 691                         struct ncp_privatedata_ioctl user;
 692                         size_t outl;
 693
 694 #ifdef CONFIG_COMPAT
 695                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 696                                 struct compat_ncp_privatedata_ioctl user32;
 697                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 698                                         return -EFAULT;
 699                                 user.len = user32.len;
 700                                 user.data = compat_ptr(user32.data);
 701                         } else
 702 #endif
 703                         if (copy_from_user(&user, argp, sizeof(user)))
 704                                 return -EFAULT;
 705
 706                         down_read(&server->auth_rwsem);
 707                         outl = user.len;
 708                         user.len = server->priv.len;
 709                         if (outl > user.len) outl = user.len;
 710                         result = 0;
 711                         if (outl) {
 712                                 if (copy_to_user(user.data,
 713                                                  server->priv.data,
 714                                                  outl))
 715                                         result = -EFAULT;
 716                         }
 717                         up_read(&server->auth_rwsem);
 718                         if (result)
 719                                 return result;
 720 #ifdef CONFIG_COMPAT
 721                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 722                                 struct compat_ncp_privatedata_ioctl user32;
 723                                 user32.len = user.len;
 724                                 user32.data = (unsigned long) user.data;
 725                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 726                                         return -EFAULT;
 727                         } else
 728 #endif
 729                         if (copy_to_user(argp, &user, sizeof(user)))
 730                                 return -EFAULT;
 731
 732                         return 0;
 733                 }
 734
 735 #ifdef CONFIG_COMPAT
 736         case NCP_IOC_SETPRIVATEDATA_32:
 737 #endif
 738         case NCP_IOC_SETPRIVATEDATA:
 739                 {
 740                         struct ncp_privatedata_ioctl user;
 741                         void* new;
 742                         void* old;
 743                         size_t oldlen;
 744
 745 #ifdef CONFIG_COMPAT
 746                         if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
 747                                 struct compat_ncp_privatedata_ioctl user32;
 748                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 749                                         return -EFAULT;
 750                                 user.len = user32.len;
 751                                 user.data = compat_ptr(user32.data);
 752                         } else
 753 #endif
 754                         if (copy_from_user(&user, argp, sizeof(user)))
 755                                 return -EFAULT;
 756
 757                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 758                                 return -ENOMEM;
 759                         if (user.len) {
 760                                 new = memdup_user(user.data, user.len);
 761                                 if (IS_ERR(new))
 762                                         return PTR_ERR(new);
 763                         } else {
 764                                 new = NULL;
 765                         }
 766                         down_write(&server->auth_rwsem);
 767                         old = server->priv.data;
 768                         oldlen = server->priv.len;
 769                         server->priv.len = user.len;
 770                         server->priv.data = new;
 771                         up_write(&server->auth_rwsem);
 772                         kfree(old);
 773                         return 0;
 774                 }
 775
 776 #ifdef CONFIG_NCPFS_NLS
 777         case NCP_IOC_SETCHARSETS:
 778                 return ncp_set_charsets(server, argp);
 779
 780         case NCP_IOC_GETCHARSETS:
 781                 return ncp_get_charsets(server, argp);
 782
 783 #endif /* CONFIG_NCPFS_NLS */
 784
 785         case NCP_IOC_SETDENTRYTTL:
 786                 {
 787                         u_int32_t user;
 788
 789                         if (copy_from_user(&user, argp, sizeof(user)))
 790                                 return -EFAULT;
 791                         /* 20 secs at most... */
 792                         if (user > 20000)
 793                                 return -EINVAL;
 794                         user = (user * HZ) / 1000;
 795                         atomic_set(&server->dentry_ttl, user);
 796                         return 0;
 797                 }
 798
 799         case NCP_IOC_GETDENTRYTTL:
 800                 {
 801                         u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ;
 802                         if (copy_to_user(argp, &user, sizeof(user)))
 803                                 return -EFAULT;
 804                         return 0;
 805                 }
 806
 807         }
 808         return -EINVAL;
 809 }
 810
 811 long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 812 {
 813         struct inode *inode = file_inode(filp);
 814         struct ncp_server *server = NCP_SERVER(inode);
 815         kuid_t uid = current_uid();
 816         int need_drop_write = 0;
 817         long ret;
 818
 819         switch (cmd) {
 820         case NCP_IOC_SETCHARSETS:
 821         case NCP_IOC_CONN_LOGGED_IN:
 822         case NCP_IOC_SETROOT:
 823                 if (!capable(CAP_SYS_ADMIN)) {
 824                         ret = -EPERM;
 825                         goto out;
 826                 }
 827                 break;
 828         }
 829         if (!uid_eq(server->m.mounted_uid, uid)) {
 830                 switch (cmd) {
 831                 /*
 832                  * Only mount owner can issue these ioctls.  Information
 833                  * necessary to authenticate to other NDS servers are
 834                  * stored here.
 835                  */
 836                 case NCP_IOC_GETOBJECTNAME:
 837                 case NCP_IOC_SETOBJECTNAME:
 838                 case NCP_IOC_GETPRIVATEDATA:
 839                 case NCP_IOC_SETPRIVATEDATA:
 840 #ifdef CONFIG_COMPAT
 841                 case NCP_IOC_GETOBJECTNAME_32:
 842                 case NCP_IOC_SETOBJECTNAME_32:
 843                 case NCP_IOC_GETPRIVATEDATA_32:
 844                 case NCP_IOC_SETPRIVATEDATA_32:
 845 #endif
 846                         ret = -EACCES;
 847                         goto out;
 848                 /*
 849                  * These require write access on the inode if user id
 850                  * does not match.  Note that they do not write to the
 851                  * file...  But old code did mnt_want_write, so I keep
 852                  * it as is.  Of course not for mountpoint owner, as
 853                  * that breaks read-only mounts altogether as ncpmount
 854                  * needs working NCP_IOC_NCPREQUEST and
 855                  * NCP_IOC_GET_FS_INFO.  Some of these codes (setdentryttl,
 856                  * signinit, setsignwanted) should be probably restricted
 857                  * to owner only, or even more to CAP_SYS_ADMIN).
 858                  */
 859                 case NCP_IOC_GET_FS_INFO:
 860                 case NCP_IOC_GET_FS_INFO_V2:
 861                 case NCP_IOC_NCPREQUEST:
 862                 case NCP_IOC_SETDENTRYTTL:
 863                 case NCP_IOC_SIGN_INIT:
 864                 case NCP_IOC_LOCKUNLOCK:
 865                 case NCP_IOC_SET_SIGN_WANTED:
 866 #ifdef CONFIG_COMPAT
 867                 case NCP_IOC_GET_FS_INFO_V2_32:
 868                 case NCP_IOC_NCPREQUEST_32:
 869 #endif
 870                         ret = mnt_want_write_file(filp);
 871                         if (ret)
 872                                 goto out;
 873                         need_drop_write = 1;
 874                         ret = inode_permission(inode, MAY_WRITE);
 875                         if (ret)
 876                                 goto outDropWrite;
 877                         break;
 878                 /*
 879                  * Read access required.
 880                  */
 881                 case NCP_IOC_GETMOUNTUID16:
 882                 case NCP_IOC_GETMOUNTUID32:
 883                 case NCP_IOC_GETMOUNTUID64:
 884                 case NCP_IOC_GETROOT:
 885                 case NCP_IOC_SIGN_WANTED:
 886                         ret = inode_permission(inode, MAY_READ);
 887                         if (ret)
 888                                 goto out;
 889                         break;
 890                 /*
 891                  * Anybody can read these.
 892                  */
 893                 case NCP_IOC_GETCHARSETS:
 894                 case NCP_IOC_GETDENTRYTTL:
 895                 default:
 896                 /* Three codes below are protected by CAP_SYS_ADMIN above. */
 897                 case NCP_IOC_SETCHARSETS:
 898                 case NCP_IOC_CONN_LOGGED_IN:
 899                 case NCP_IOC_SETROOT:
 900                         break;
 901                 }
 902         }
 903         ret = __ncp_ioctl(inode, cmd, arg);
 904 outDropWrite:
 905         if (need_drop_write)
 906                 mnt_drop_write_file(filp);
 907 out:
 908         return ret;
 909 }
 910
 911 #ifdef CONFIG_COMPAT
 912 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 913 {
 914         long ret;
 915
 916         arg = (unsigned long) compat_ptr(arg);
 917         ret = ncp_ioctl(file, cmd, arg);
 918         return ret;
 919 }
 920 #endif