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                 DPRINTK("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                 DPRINTK("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                 DPRINTK("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                 DPRINTK("ncp_ioctl: copy %d bytes\n",
 312                         result);
 313                 if (result >= 0)
 314                         if (copy_to_user(request.data, bouncebuffer, result))
 315                                 result = -EFAULT;
 316                 vfree(bouncebuffer);
 317                 return result;
 318
 319         case NCP_IOC_CONN_LOGGED_IN:
 320
 321                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
 322                         return -EINVAL;
 323                 mutex_lock(&server->root_setup_lock);
 324                 if (server->root_setuped)
 325                         result = -EBUSY;
 326                 else {
 327                         result = ncp_conn_logged_in(inode->i_sb);
 328                         if (result == 0)
 329                                 server->root_setuped = 1;
 330                 }
 331                 mutex_unlock(&server->root_setup_lock);
 332                 return result;
 333
 334         case NCP_IOC_GET_FS_INFO:
 335                 return ncp_get_fs_info(server, inode, argp);
 336
 337         case NCP_IOC_GET_FS_INFO_V2:
 338                 return ncp_get_fs_info_v2(server, inode, argp);
 339
 340 #ifdef CONFIG_COMPAT
 341         case NCP_IOC_GET_FS_INFO_V2_32:
 342                 return ncp_get_compat_fs_info_v2(server, inode, argp);
 343 #endif
 344         /* we have too many combinations of CONFIG_COMPAT,
 345          * CONFIG_64BIT and CONFIG_UID16, so just handle
 346          * any of the possible ioctls */
 347         case NCP_IOC_GETMOUNTUID16:
 348                 {
 349                         u16 uid;
 350
 351                         SET_UID(uid, from_kuid_munged(current_user_ns(), server->m.mounted_uid));
 352                         if (put_user(uid, (u16 __user *)argp))
 353                                 return -EFAULT;
 354                         return 0;
 355                 }
 356         case NCP_IOC_GETMOUNTUID32:
 357         {
 358                 uid_t uid = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 359                 if (put_user(uid, (u32 __user *)argp))
 360                         return -EFAULT;
 361                 return 0;
 362         }
 363         case NCP_IOC_GETMOUNTUID64:
 364         {
 365                 uid_t uid = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 366                 if (put_user(uid, (u64 __user *)argp))
 367                         return -EFAULT;
 368                 return 0;
 369         }
 370         case NCP_IOC_GETROOT:
 371                 {
 372                         struct ncp_setroot_ioctl sr;
 373
 374                         result = -EACCES;
 375                         mutex_lock(&server->root_setup_lock);
 376                         if (server->m.mounted_vol[0]) {
 377                                 struct dentry* dentry = inode->i_sb->s_root;
 378
 379                                 if (dentry) {
 380                                         struct inode* s_inode = dentry->d_inode;
 381
 382                                         if (s_inode) {
 383                                                 sr.volNumber = NCP_FINFO(s_inode)->volNumber;
 384                                                 sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
 385                                                 sr.namespace = server->name_space[sr.volNumber];
 386                                                 result = 0;
 387                                         } else
 388                                                 DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 389                                 } else
 390                                         DPRINTK("ncpfs: s_root==NULL\n");
 391                         } else {
 392                                 sr.volNumber = -1;
 393                                 sr.namespace = 0;
 394                                 sr.dirEntNum = 0;
 395                                 result = 0;
 396                         }
 397                         mutex_unlock(&server->root_setup_lock);
 398                         if (!result && copy_to_user(argp, &sr, sizeof(sr)))
 399                                 result = -EFAULT;
 400                         return result;
 401                 }
 402
 403         case NCP_IOC_SETROOT:
 404                 {
 405                         struct ncp_setroot_ioctl sr;
 406                         __u32 vnum;
 407                         __le32 de;
 408                         __le32 dosde;
 409                         struct dentry* dentry;
 410
 411                         if (copy_from_user(&sr, argp, sizeof(sr)))
 412                                 return -EFAULT;
 413                         mutex_lock(&server->root_setup_lock);
 414                         if (server->root_setuped)
 415                                 result = -EBUSY;
 416                         else {
 417                                 if (sr.volNumber < 0) {
 418                                         server->m.mounted_vol[0] = 0;
 419                                         vnum = NCP_NUMBER_OF_VOLUMES;
 420                                         de = 0;
 421                                         dosde = 0;
 422                                         result = 0;
 423                                 } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 424                                         result = -EINVAL;
 425                                 } else if (ncp_mount_subdir(server, sr.volNumber,
 426                                                         sr.namespace, sr.dirEntNum,
 427                                                         &vnum, &de, &dosde)) {
 428                                         result = -ENOENT;
 429                                 } else
 430                                         result = 0;
 431
 432                                 if (result == 0) {
 433                                         dentry = inode->i_sb->s_root;
 434                                         if (dentry) {
 435                                                 struct inode* s_inode = dentry->d_inode;
 436
 437                                                 if (s_inode) {
 438                                                         NCP_FINFO(s_inode)->volNumber = vnum;
 439                                                         NCP_FINFO(s_inode)->dirEntNum = de;
 440                                                         NCP_FINFO(s_inode)->DosDirNum = dosde;
 441                                                         server->root_setuped = 1;
 442                                                 } else {
 443                                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 444                                                         result = -EIO;
 445                                                 }
 446                                         } else {
 447                                                 DPRINTK("ncpfs: s_root==NULL\n");
 448                                                 result = -EIO;
 449                                         }
 450                                 }
 451                                 result = 0;
 452                         }
 453                         mutex_unlock(&server->root_setup_lock);
 454
 455                         return result;
 456                 }
 457
 458 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 459         case NCP_IOC_SIGN_INIT:
 460                 {
 461                         struct ncp_sign_init sign;
 462
 463                         if (argp)
 464                                 if (copy_from_user(&sign, argp, sizeof(sign)))
 465                                         return -EFAULT;
 466                         ncp_lock_server(server);
 467                         mutex_lock(&server->rcv.creq_mutex);
 468                         if (argp) {
 469                                 if (server->sign_wanted) {
 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                         mutex_unlock(&server->rcv.creq_mutex);
 479                         ncp_unlock_server(server);
 480                         return 0;
 481                 }
 482
 483         case NCP_IOC_SIGN_WANTED:
 484                 {
 485                         int state;
 486
 487                         ncp_lock_server(server);
 488                         state = server->sign_wanted;
 489                         ncp_unlock_server(server);
 490                         if (put_user(state, (int __user *)argp))
 491                                 return -EFAULT;
 492                         return 0;
 493                 }
 494
 495         case NCP_IOC_SET_SIGN_WANTED:
 496                 {
 497                         int newstate;
 498
 499                         /* get only low 8 bits... */
 500                         if (get_user(newstate, (unsigned char __user *)argp))
 501                                 return -EFAULT;
 502                         result = 0;
 503                         ncp_lock_server(server);
 504                         if (server->sign_active) {
 505                                 /* cannot turn signatures OFF when active */
 506                                 if (!newstate)
 507                                         result = -EINVAL;
 508                         } else {
 509                                 server->sign_wanted = newstate != 0;
 510                         }
 511                         ncp_unlock_server(server);
 512                         return result;
 513                 }
 514
 515 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 516
 517 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 518         case NCP_IOC_LOCKUNLOCK:
 519                 {
 520                         struct ncp_lock_ioctl    rqdata;
 521
 522                         if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
 523                                 return -EFAULT;
 524                         if (rqdata.origin != 0)
 525                                 return -EINVAL;
 526                         /* check for cmd */
 527                         switch (rqdata.cmd) {
 528                                 case NCP_LOCK_EX:
 529                                 case NCP_LOCK_SH:
 530                                                 if (rqdata.timeout == 0)
 531                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 532                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 533                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 534                                                 break;
 535                                 case NCP_LOCK_LOG:
 536                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 537                                 case NCP_LOCK_CLEAR:
 538                                                 break;
 539                                 default:
 540                                                 return -EINVAL;
 541                         }
 542                         /* locking needs both read and write access */
 543                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 544                         {
 545                                 return result;
 546                         }
 547                         result = -EISDIR;
 548                         if (!S_ISREG(inode->i_mode))
 549                                 goto outrel;
 550                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 551                         {
 552                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 553                                                         NCP_FINFO(inode)->file_handle,
 554                                                         rqdata.offset,
 555                                                         rqdata.length);
 556                                 if (result > 0) result = 0;     /* no such lock */
 557                         }
 558                         else
 559                         {
 560                                 int lockcmd;
 561
 562                                 switch (rqdata.cmd)
 563                                 {
 564                                         case NCP_LOCK_EX:  lockcmd=1; break;
 565                                         case NCP_LOCK_SH:  lockcmd=3; break;
 566                                         default:           lockcmd=0; break;
 567                                 }
 568                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 569                                                         NCP_FINFO(inode)->file_handle,
 570                                                         lockcmd,
 571                                                         rqdata.offset,
 572                                                         rqdata.length,
 573                                                         rqdata.timeout);
 574                                 if (result > 0) result = -EAGAIN;
 575                         }
 576 outrel:
 577                         ncp_inode_close(inode);
 578                         return result;
 579                 }
 580 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 581
 582 #ifdef CONFIG_COMPAT
 583         case NCP_IOC_GETOBJECTNAME_32:
 584                 {
 585                         struct compat_ncp_objectname_ioctl user;
 586                         size_t outl;
 587
 588                         if (copy_from_user(&user, argp, sizeof(user)))
 589                                 return -EFAULT;
 590                         down_read(&server->auth_rwsem);
 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                         result = 0;
 597                         if (outl) {
 598                                 if (copy_to_user(compat_ptr(user.object_name),
 599                                                  server->auth.object_name,
 600                                                  outl))
 601                                         result = -EFAULT;
 602                         }
 603                         up_read(&server->auth_rwsem);
 604                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 605                                 result = -EFAULT;
 606                         return result;
 607                 }
 608 #endif
 609
 610         case NCP_IOC_GETOBJECTNAME:
 611                 {
 612                         struct ncp_objectname_ioctl user;
 613                         size_t outl;
 614
 615                         if (copy_from_user(&user, argp, sizeof(user)))
 616                                 return -EFAULT;
 617                         down_read(&server->auth_rwsem);
 618                         user.auth_type = server->auth.auth_type;
 619                         outl = user.object_name_len;
 620                         user.object_name_len = server->auth.object_name_len;
 621                         if (outl > user.object_name_len)
 622                                 outl = user.object_name_len;
 623                         result = 0;
 624                         if (outl) {
 625                                 if (copy_to_user(user.object_name,
 626                                                  server->auth.object_name,
 627                                                  outl))
 628                                         result = -EFAULT;
 629                         }
 630                         up_read(&server->auth_rwsem);
 631                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 632                                 result = -EFAULT;
 633                         return result;
 634                 }
 635
 636 #ifdef CONFIG_COMPAT
 637         case NCP_IOC_SETOBJECTNAME_32:
 638 #endif
 639         case NCP_IOC_SETOBJECTNAME:
 640                 {
 641                         struct ncp_objectname_ioctl user;
 642                         void* newname;
 643                         void* oldname;
 644                         size_t oldnamelen;
 645                         void* oldprivate;
 646                         size_t oldprivatelen;
 647
 648 #ifdef CONFIG_COMPAT
 649                         if (cmd == NCP_IOC_SETOBJECTNAME_32) {
 650                                 struct compat_ncp_objectname_ioctl user32;
 651                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 652                                         return -EFAULT;
 653                                 user.auth_type = user32.auth_type;
 654                                 user.object_name_len = user32.object_name_len;
 655                                 user.object_name = compat_ptr(user32.object_name);
 656                         } else
 657 #endif
 658                         if (copy_from_user(&user, argp, sizeof(user)))
 659                                 return -EFAULT;
 660
 661                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 662                                 return -ENOMEM;
 663                         if (user.object_name_len) {
 664                                 newname = memdup_user(user.object_name,
 665                                                       user.object_name_len);
 666                                 if (IS_ERR(newname))
 667                                         return PTR_ERR(newname);
 668                         } else {
 669                                 newname = NULL;
 670                         }
 671                         down_write(&server->auth_rwsem);
 672                         oldname = server->auth.object_name;
 673                         oldnamelen = server->auth.object_name_len;
 674                         oldprivate = server->priv.data;
 675                         oldprivatelen = server->priv.len;
 676                         server->auth.auth_type = user.auth_type;
 677                         server->auth.object_name_len = user.object_name_len;
 678                         server->auth.object_name = newname;
 679                         server->priv.len = 0;
 680                         server->priv.data = NULL;
 681                         up_write(&server->auth_rwsem);
 682                         kfree(oldprivate);
 683                         kfree(oldname);
 684                         return 0;
 685                 }
 686
 687 #ifdef CONFIG_COMPAT
 688         case NCP_IOC_GETPRIVATEDATA_32:
 689 #endif
 690         case NCP_IOC_GETPRIVATEDATA:
 691                 {
 692                         struct ncp_privatedata_ioctl user;
 693                         size_t outl;
 694
 695 #ifdef CONFIG_COMPAT
 696                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 697                                 struct compat_ncp_privatedata_ioctl user32;
 698                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 699                                         return -EFAULT;
 700                                 user.len = user32.len;
 701                                 user.data = compat_ptr(user32.data);
 702                         } else
 703 #endif
 704                         if (copy_from_user(&user, argp, sizeof(user)))
 705                                 return -EFAULT;
 706
 707                         down_read(&server->auth_rwsem);
 708                         outl = user.len;
 709                         user.len = server->priv.len;
 710                         if (outl > user.len) outl = user.len;
 711                         result = 0;
 712                         if (outl) {
 713                                 if (copy_to_user(user.data,
 714                                                  server->priv.data,
 715                                                  outl))
 716                                         result = -EFAULT;
 717                         }
 718                         up_read(&server->auth_rwsem);
 719                         if (result)
 720                                 return result;
 721 #ifdef CONFIG_COMPAT
 722                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 723                                 struct compat_ncp_privatedata_ioctl user32;
 724                                 user32.len = user.len;
 725                                 user32.data = (unsigned long) user.data;
 726                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 727                                         return -EFAULT;
 728                         } else
 729 #endif
 730                         if (copy_to_user(argp, &user, sizeof(user)))
 731                                 return -EFAULT;
 732
 733                         return 0;
 734                 }
 735
 736 #ifdef CONFIG_COMPAT
 737         case NCP_IOC_SETPRIVATEDATA_32:
 738 #endif
 739         case NCP_IOC_SETPRIVATEDATA:
 740                 {
 741                         struct ncp_privatedata_ioctl user;
 742                         void* new;
 743                         void* old;
 744                         size_t oldlen;
 745
 746 #ifdef CONFIG_COMPAT
 747                         if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
 748                                 struct compat_ncp_privatedata_ioctl user32;
 749                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 750                                         return -EFAULT;
 751                                 user.len = user32.len;
 752                                 user.data = compat_ptr(user32.data);
 753                         } else
 754 #endif
 755                         if (copy_from_user(&user, argp, sizeof(user)))
 756                                 return -EFAULT;
 757
 758                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 759                                 return -ENOMEM;
 760                         if (user.len) {
 761                                 new = memdup_user(user.data, user.len);
 762                                 if (IS_ERR(new))
 763                                         return PTR_ERR(new);
 764                         } else {
 765                                 new = NULL;
 766                         }
 767                         down_write(&server->auth_rwsem);
 768                         old = server->priv.data;
 769                         oldlen = server->priv.len;
 770                         server->priv.len = user.len;
 771                         server->priv.data = new;
 772                         up_write(&server->auth_rwsem);
 773                         kfree(old);
 774                         return 0;
 775                 }
 776
 777 #ifdef CONFIG_NCPFS_NLS
 778         case NCP_IOC_SETCHARSETS:
 779                 return ncp_set_charsets(server, argp);
 780
 781         case NCP_IOC_GETCHARSETS:
 782                 return ncp_get_charsets(server, argp);
 783
 784 #endif /* CONFIG_NCPFS_NLS */
 785
 786         case NCP_IOC_SETDENTRYTTL:
 787                 {
 788                         u_int32_t user;
 789
 790                         if (copy_from_user(&user, argp, sizeof(user)))
 791                                 return -EFAULT;
 792                         /* 20 secs at most... */
 793                         if (user > 20000)
 794                                 return -EINVAL;
 795                         user = (user * HZ) / 1000;
 796                         atomic_set(&server->dentry_ttl, user);
 797                         return 0;
 798                 }
 799
 800         case NCP_IOC_GETDENTRYTTL:
 801                 {
 802                         u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ;
 803                         if (copy_to_user(argp, &user, sizeof(user)))
 804                                 return -EFAULT;
 805                         return 0;
 806                 }
 807
 808         }
 809         return -EINVAL;
 810 }
 811
 812 long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 813 {
 814         struct inode *inode = file_inode(filp);
 815         struct ncp_server *server = NCP_SERVER(inode);
 816         kuid_t uid = current_uid();
 817         int need_drop_write = 0;
 818         long ret;
 819
 820         switch (cmd) {
 821         case NCP_IOC_SETCHARSETS:
 822         case NCP_IOC_CONN_LOGGED_IN:
 823         case NCP_IOC_SETROOT:
 824                 if (!capable(CAP_SYS_ADMIN)) {
 825                         ret = -EPERM;
 826                         goto out;
 827                 }
 828                 break;
 829         }
 830         if (!uid_eq(server->m.mounted_uid, uid)) {
 831                 switch (cmd) {
 832                 /*
 833                  * Only mount owner can issue these ioctls.  Information
 834                  * necessary to authenticate to other NDS servers are
 835                  * stored here.
 836                  */
 837                 case NCP_IOC_GETOBJECTNAME:
 838                 case NCP_IOC_SETOBJECTNAME:
 839                 case NCP_IOC_GETPRIVATEDATA:
 840                 case NCP_IOC_SETPRIVATEDATA:
 841 #ifdef CONFIG_COMPAT
 842                 case NCP_IOC_GETOBJECTNAME_32:
 843                 case NCP_IOC_SETOBJECTNAME_32:
 844                 case NCP_IOC_GETPRIVATEDATA_32:
 845                 case NCP_IOC_SETPRIVATEDATA_32:
 846 #endif
 847                         ret = -EACCES;
 848                         goto out;
 849                 /*
 850                  * These require write access on the inode if user id
 851                  * does not match.  Note that they do not write to the
 852                  * file...  But old code did mnt_want_write, so I keep
 853                  * it as is.  Of course not for mountpoint owner, as
 854                  * that breaks read-only mounts altogether as ncpmount
 855                  * needs working NCP_IOC_NCPREQUEST and
 856                  * NCP_IOC_GET_FS_INFO.  Some of these codes (setdentryttl,
 857                  * signinit, setsignwanted) should be probably restricted
 858                  * to owner only, or even more to CAP_SYS_ADMIN).
 859                  */
 860                 case NCP_IOC_GET_FS_INFO:
 861                 case NCP_IOC_GET_FS_INFO_V2:
 862                 case NCP_IOC_NCPREQUEST:
 863                 case NCP_IOC_SETDENTRYTTL:
 864                 case NCP_IOC_SIGN_INIT:
 865                 case NCP_IOC_LOCKUNLOCK:
 866                 case NCP_IOC_SET_SIGN_WANTED:
 867 #ifdef CONFIG_COMPAT
 868                 case NCP_IOC_GET_FS_INFO_V2_32:
 869                 case NCP_IOC_NCPREQUEST_32:
 870 #endif
 871                         ret = mnt_want_write_file(filp);
 872                         if (ret)
 873                                 goto out;
 874                         need_drop_write = 1;
 875                         ret = inode_permission(inode, MAY_WRITE);
 876                         if (ret)
 877                                 goto outDropWrite;
 878                         break;
 879                 /*
 880                  * Read access required.
 881                  */
 882                 case NCP_IOC_GETMOUNTUID16:
 883                 case NCP_IOC_GETMOUNTUID32:
 884                 case NCP_IOC_GETMOUNTUID64:
 885                 case NCP_IOC_GETROOT:
 886                 case NCP_IOC_SIGN_WANTED:
 887                         ret = inode_permission(inode, MAY_READ);
 888                         if (ret)
 889                                 goto out;
 890                         break;
 891                 /*
 892                  * Anybody can read these.
 893                  */
 894                 case NCP_IOC_GETCHARSETS:
 895                 case NCP_IOC_GETDENTRYTTL:
 896                 default:
 897                 /* Three codes below are protected by CAP_SYS_ADMIN above. */
 898                 case NCP_IOC_SETCHARSETS:
 899                 case NCP_IOC_CONN_LOGGED_IN:
 900                 case NCP_IOC_SETROOT:
 901                         break;
 902                 }
 903         }
 904         ret = __ncp_ioctl(inode, cmd, arg);
 905 outDropWrite:
 906         if (need_drop_write)
 907                 mnt_drop_write_file(filp);
 908 out:
 909         return ret;
 910 }
 911
 912 #ifdef CONFIG_COMPAT
 913 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 914 {
 915         long ret;
 916
 917         arg = (unsigned long) compat_ptr(arg);
 918         ret = ncp_ioctl(file, cmd, arg);
 919         return ret;
 920 }
 921 #endif