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, 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   = 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   = 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, 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                 if (put_user(server->m.mounted_uid,
 358                              (u32 __user *)argp))
 359                         return -EFAULT;
 360                 return 0;
 361         case NCP_IOC_GETMOUNTUID64:
 362                 if (put_user(server->m.mounted_uid,
 363                              (u64 __user *)argp))
 364                         return -EFAULT;
 365                 return 0;
 366
 367         case NCP_IOC_GETROOT:
 368                 {
 369                         struct ncp_setroot_ioctl sr;
 370
 371                         result = -EACCES;
 372                         mutex_lock(&server->root_setup_lock);
 373                         if (server->m.mounted_vol[0]) {
 374                                 struct dentry* dentry = inode->i_sb->s_root;
 375
 376                                 if (dentry) {
 377                                         struct inode* s_inode = dentry->d_inode;
 378
 379                                         if (s_inode) {
 380                                                 sr.volNumber = NCP_FINFO(s_inode)->volNumber;
 381                                                 sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
 382                                                 sr.namespace = server->name_space[sr.volNumber];
 383                                                 result = 0;
 384                                         } else
 385                                                 DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 386                                 } else
 387                                         DPRINTK("ncpfs: s_root==NULL\n");
 388                         } else {
 389                                 sr.volNumber = -1;
 390                                 sr.namespace = 0;
 391                                 sr.dirEntNum = 0;
 392                                 result = 0;
 393                         }
 394                         mutex_unlock(&server->root_setup_lock);
 395                         if (!result && copy_to_user(argp, &sr, sizeof(sr)))
 396                                 result = -EFAULT;
 397                         return result;
 398                 }
 399
 400         case NCP_IOC_SETROOT:
 401                 {
 402                         struct ncp_setroot_ioctl sr;
 403                         __u32 vnum;
 404                         __le32 de;
 405                         __le32 dosde;
 406                         struct dentry* dentry;
 407
 408                         if (copy_from_user(&sr, argp, sizeof(sr)))
 409                                 return -EFAULT;
 410                         mutex_lock(&server->root_setup_lock);
 411                         if (server->root_setuped)
 412                                 result = -EBUSY;
 413                         else {
 414                                 if (sr.volNumber < 0) {
 415                                         server->m.mounted_vol[0] = 0;
 416                                         vnum = NCP_NUMBER_OF_VOLUMES;
 417                                         de = 0;
 418                                         dosde = 0;
 419                                         result = 0;
 420                                 } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 421                                         result = -EINVAL;
 422                                 } else if (ncp_mount_subdir(server, sr.volNumber,
 423                                                         sr.namespace, sr.dirEntNum,
 424                                                         &vnum, &de, &dosde)) {
 425                                         result = -ENOENT;
 426                                 } else
 427                                         result = 0;
 428
 429                                 if (result == 0) {
 430                                         dentry = inode->i_sb->s_root;
 431                                         if (dentry) {
 432                                                 struct inode* s_inode = dentry->d_inode;
 433
 434                                                 if (s_inode) {
 435                                                         NCP_FINFO(s_inode)->volNumber = vnum;
 436                                                         NCP_FINFO(s_inode)->dirEntNum = de;
 437                                                         NCP_FINFO(s_inode)->DosDirNum = dosde;
 438                                                         server->root_setuped = 1;
 439                                                 } else {
 440                                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 441                                                         result = -EIO;
 442                                                 }
 443                                         } else {
 444                                                 DPRINTK("ncpfs: s_root==NULL\n");
 445                                                 result = -EIO;
 446                                         }
 447                                 }
 448                                 result = 0;
 449                         }
 450                         mutex_unlock(&server->root_setup_lock);
 451
 452                         return result;
 453                 }
 454
 455 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 456         case NCP_IOC_SIGN_INIT:
 457                 {
 458                         struct ncp_sign_init sign;
 459
 460                         if (argp)
 461                                 if (copy_from_user(&sign, argp, sizeof(sign)))
 462                                         return -EFAULT;
 463                         ncp_lock_server(server);
 464                         mutex_lock(&server->rcv.creq_mutex);
 465                         if (argp) {
 466                                 if (server->sign_wanted) {
 467                                         memcpy(server->sign_root,sign.sign_root,8);
 468                                         memcpy(server->sign_last,sign.sign_last,16);
 469                                         server->sign_active = 1;
 470                                 }
 471                                 /* ignore when signatures not wanted */
 472                         } else {
 473                                 server->sign_active = 0;
 474                         }
 475                         mutex_unlock(&server->rcv.creq_mutex);
 476                         ncp_unlock_server(server);
 477                         return 0;
 478                 }
 479
 480         case NCP_IOC_SIGN_WANTED:
 481                 {
 482                         int state;
 483
 484                         ncp_lock_server(server);
 485                         state = server->sign_wanted;
 486                         ncp_unlock_server(server);
 487                         if (put_user(state, (int __user *)argp))
 488                                 return -EFAULT;
 489                         return 0;
 490                 }
 491
 492         case NCP_IOC_SET_SIGN_WANTED:
 493                 {
 494                         int newstate;
 495
 496                         /* get only low 8 bits... */
 497                         if (get_user(newstate, (unsigned char __user *)argp))
 498                                 return -EFAULT;
 499                         result = 0;
 500                         ncp_lock_server(server);
 501                         if (server->sign_active) {
 502                                 /* cannot turn signatures OFF when active */
 503                                 if (!newstate)
 504                                         result = -EINVAL;
 505                         } else {
 506                                 server->sign_wanted = newstate != 0;
 507                         }
 508                         ncp_unlock_server(server);
 509                         return result;
 510                 }
 511
 512 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 513
 514 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 515         case NCP_IOC_LOCKUNLOCK:
 516                 {
 517                         struct ncp_lock_ioctl    rqdata;
 518
 519                         if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
 520                                 return -EFAULT;
 521                         if (rqdata.origin != 0)
 522                                 return -EINVAL;
 523                         /* check for cmd */
 524                         switch (rqdata.cmd) {
 525                                 case NCP_LOCK_EX:
 526                                 case NCP_LOCK_SH:
 527                                                 if (rqdata.timeout == 0)
 528                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 529                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 530                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 531                                                 break;
 532                                 case NCP_LOCK_LOG:
 533                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 534                                 case NCP_LOCK_CLEAR:
 535                                                 break;
 536                                 default:
 537                                                 return -EINVAL;
 538                         }
 539                         /* locking needs both read and write access */
 540                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 541                         {
 542                                 return result;
 543                         }
 544                         result = -EISDIR;
 545                         if (!S_ISREG(inode->i_mode))
 546                                 goto outrel;
 547                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 548                         {
 549                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 550                                                         NCP_FINFO(inode)->file_handle,
 551                                                         rqdata.offset,
 552                                                         rqdata.length);
 553                                 if (result > 0) result = 0;     /* no such lock */
 554                         }
 555                         else
 556                         {
 557                                 int lockcmd;
 558
 559                                 switch (rqdata.cmd)
 560                                 {
 561                                         case NCP_LOCK_EX:  lockcmd=1; break;
 562                                         case NCP_LOCK_SH:  lockcmd=3; break;
 563                                         default:           lockcmd=0; break;
 564                                 }
 565                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 566                                                         NCP_FINFO(inode)->file_handle,
 567                                                         lockcmd,
 568                                                         rqdata.offset,
 569                                                         rqdata.length,
 570                                                         rqdata.timeout);
 571                                 if (result > 0) result = -EAGAIN;
 572                         }
 573 outrel:
 574                         ncp_inode_close(inode);
 575                         return result;
 576                 }
 577 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 578
 579 #ifdef CONFIG_COMPAT
 580         case NCP_IOC_GETOBJECTNAME_32:
 581                 {
 582                         struct compat_ncp_objectname_ioctl user;
 583                         size_t outl;
 584
 585                         if (copy_from_user(&user, argp, sizeof(user)))
 586                                 return -EFAULT;
 587                         down_read(&server->auth_rwsem);
 588                         user.auth_type = server->auth.auth_type;
 589                         outl = user.object_name_len;
 590                         user.object_name_len = server->auth.object_name_len;
 591                         if (outl > user.object_name_len)
 592                                 outl = user.object_name_len;
 593                         result = 0;
 594                         if (outl) {
 595                                 if (copy_to_user(compat_ptr(user.object_name),
 596                                                  server->auth.object_name,
 597                                                  outl))
 598                                         result = -EFAULT;
 599                         }
 600                         up_read(&server->auth_rwsem);
 601                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 602                                 result = -EFAULT;
 603                         return result;
 604                 }
 605 #endif
 606
 607         case NCP_IOC_GETOBJECTNAME:
 608                 {
 609                         struct ncp_objectname_ioctl user;
 610                         size_t outl;
 611
 612                         if (copy_from_user(&user, argp, sizeof(user)))
 613                                 return -EFAULT;
 614                         down_read(&server->auth_rwsem);
 615                         user.auth_type = server->auth.auth_type;
 616                         outl = user.object_name_len;
 617                         user.object_name_len = server->auth.object_name_len;
 618                         if (outl > user.object_name_len)
 619                                 outl = user.object_name_len;
 620                         result = 0;
 621                         if (outl) {
 622                                 if (copy_to_user(user.object_name,
 623                                                  server->auth.object_name,
 624                                                  outl))
 625                                         result = -EFAULT;
 626                         }
 627                         up_read(&server->auth_rwsem);
 628                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 629                                 result = -EFAULT;
 630                         return result;
 631                 }
 632
 633 #ifdef CONFIG_COMPAT
 634         case NCP_IOC_SETOBJECTNAME_32:
 635 #endif
 636         case NCP_IOC_SETOBJECTNAME:
 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                         down_write(&server->auth_rwsem);
 669                         oldname = server->auth.object_name;
 670                         oldnamelen = server->auth.object_name_len;
 671                         oldprivate = server->priv.data;
 672                         oldprivatelen = server->priv.len;
 673                         server->auth.auth_type = user.auth_type;
 674                         server->auth.object_name_len = user.object_name_len;
 675                         server->auth.object_name = newname;
 676                         server->priv.len = 0;
 677                         server->priv.data = NULL;
 678                         up_write(&server->auth_rwsem);
 679                         kfree(oldprivate);
 680                         kfree(oldname);
 681                         return 0;
 682                 }
 683
 684 #ifdef CONFIG_COMPAT
 685         case NCP_IOC_GETPRIVATEDATA_32:
 686 #endif
 687         case NCP_IOC_GETPRIVATEDATA:
 688                 {
 689                         struct ncp_privatedata_ioctl user;
 690                         size_t outl;
 691
 692 #ifdef CONFIG_COMPAT
 693                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 694                                 struct compat_ncp_privatedata_ioctl user32;
 695                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 696                                         return -EFAULT;
 697                                 user.len = user32.len;
 698                                 user.data = compat_ptr(user32.data);
 699                         } else
 700 #endif
 701                         if (copy_from_user(&user, argp, sizeof(user)))
 702                                 return -EFAULT;
 703
 704                         down_read(&server->auth_rwsem);
 705                         outl = user.len;
 706                         user.len = server->priv.len;
 707                         if (outl > user.len) outl = user.len;
 708                         result = 0;
 709                         if (outl) {
 710                                 if (copy_to_user(user.data,
 711                                                  server->priv.data,
 712                                                  outl))
 713                                         result = -EFAULT;
 714                         }
 715                         up_read(&server->auth_rwsem);
 716                         if (result)
 717                                 return result;
 718 #ifdef CONFIG_COMPAT
 719                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 720                                 struct compat_ncp_privatedata_ioctl user32;
 721                                 user32.len = user.len;
 722                                 user32.data = (unsigned long) user.data;
 723                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 724                                         return -EFAULT;
 725                         } else
 726 #endif
 727                         if (copy_to_user(argp, &user, sizeof(user)))
 728                                 return -EFAULT;
 729
 730                         return 0;
 731                 }
 732
 733 #ifdef CONFIG_COMPAT
 734         case NCP_IOC_SETPRIVATEDATA_32:
 735 #endif
 736         case NCP_IOC_SETPRIVATEDATA:
 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                         down_write(&server->auth_rwsem);
 765                         old = server->priv.data;
 766                         oldlen = server->priv.len;
 767                         server->priv.len = user.len;
 768                         server->priv.data = new;
 769                         up_write(&server->auth_rwsem);
 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                 {
 785                         u_int32_t user;
 786
 787                         if (copy_from_user(&user, argp, sizeof(user)))
 788                                 return -EFAULT;
 789                         /* 20 secs at most... */
 790                         if (user > 20000)
 791                                 return -EINVAL;
 792                         user = (user * HZ) / 1000;
 793                         atomic_set(&server->dentry_ttl, user);
 794                         return 0;
 795                 }
 796
 797         case NCP_IOC_GETDENTRYTTL:
 798                 {
 799                         u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ;
 800                         if (copy_to_user(argp, &user, sizeof(user)))
 801                                 return -EFAULT;
 802                         return 0;
 803                 }
 804
 805         }
 806         return -EINVAL;
 807 }
 808
 809 long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 810 {
 811         struct inode *inode = filp->f_dentry->d_inode;
 812         struct ncp_server *server = NCP_SERVER(inode);
 813         uid_t uid = current_uid();
 814         int need_drop_write = 0;
 815         long ret;
 816
 817         switch (cmd) {
 818         case NCP_IOC_SETCHARSETS:
 819         case NCP_IOC_CONN_LOGGED_IN:
 820         case NCP_IOC_SETROOT:
 821                 if (!capable(CAP_SYS_ADMIN)) {
 822                         ret = -EACCES;
 823                         goto out;
 824                 }
 825                 break;
 826         }
 827         if (server->m.mounted_uid != uid) {
 828                 switch (cmd) {
 829                 /*
 830                  * Only mount owner can issue these ioctls.  Information
 831                  * necessary to authenticate to other NDS servers are
 832                  * stored here.
 833                  */
 834                 case NCP_IOC_GETOBJECTNAME:
 835                 case NCP_IOC_SETOBJECTNAME:
 836                 case NCP_IOC_GETPRIVATEDATA:
 837                 case NCP_IOC_SETPRIVATEDATA:
 838 #ifdef CONFIG_COMPAT
 839                 case NCP_IOC_GETOBJECTNAME_32:
 840                 case NCP_IOC_SETOBJECTNAME_32:
 841                 case NCP_IOC_GETPRIVATEDATA_32:
 842                 case NCP_IOC_SETPRIVATEDATA_32:
 843 #endif
 844                         ret = -EACCES;
 845                         goto out;
 846                 /*
 847                  * These require write access on the inode if user id
 848                  * does not match.  Note that they do not write to the
 849                  * file...  But old code did mnt_want_write, so I keep
 850                  * it as is.  Of course not for mountpoint owner, as
 851                  * that breaks read-only mounts altogether as ncpmount
 852                  * needs working NCP_IOC_NCPREQUEST and
 853                  * NCP_IOC_GET_FS_INFO.  Some of these codes (setdentryttl,
 854                  * signinit, setsignwanted) should be probably restricted
 855                  * to owner only, or even more to CAP_SYS_ADMIN).
 856                  */
 857                 case NCP_IOC_GET_FS_INFO:
 858                 case NCP_IOC_GET_FS_INFO_V2:
 859                 case NCP_IOC_NCPREQUEST:
 860                 case NCP_IOC_SETDENTRYTTL:
 861                 case NCP_IOC_SIGN_INIT:
 862                 case NCP_IOC_LOCKUNLOCK:
 863                 case NCP_IOC_SET_SIGN_WANTED:
 864 #ifdef CONFIG_COMPAT
 865                 case NCP_IOC_GET_FS_INFO_V2_32:
 866                 case NCP_IOC_NCPREQUEST_32:
 867 #endif
 868                         ret = mnt_want_write_file(filp);
 869                         if (ret)
 870                                 goto out;
 871                         need_drop_write = 1;
 872                         ret = inode_permission(inode, MAY_WRITE);
 873                         if (ret)
 874                                 goto outDropWrite;
 875                         break;
 876                 /*
 877                  * Read access required.
 878                  */
 879                 case NCP_IOC_GETMOUNTUID16:
 880                 case NCP_IOC_GETMOUNTUID32:
 881                 case NCP_IOC_GETMOUNTUID64:
 882                 case NCP_IOC_GETROOT:
 883                 case NCP_IOC_SIGN_WANTED:
 884                         ret = inode_permission(inode, MAY_READ);
 885                         if (ret)
 886                                 goto out;
 887                         break;
 888                 /*
 889                  * Anybody can read these.
 890                  */
 891                 case NCP_IOC_GETCHARSETS:
 892                 case NCP_IOC_GETDENTRYTTL:
 893                 default:
 894                 /* Three codes below are protected by CAP_SYS_ADMIN above. */
 895                 case NCP_IOC_SETCHARSETS:
 896                 case NCP_IOC_CONN_LOGGED_IN:
 897                 case NCP_IOC_SETROOT:
 898                         break;
 899                 }
 900         }
 901         ret = __ncp_ioctl(inode, cmd, arg);
 902 outDropWrite:
 903         if (need_drop_write)
 904                 mnt_drop_write(filp->f_path.mnt);
 905 out:
 906         return ret;
 907 }
 908
 909 #ifdef CONFIG_COMPAT
 910 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 911 {
 912         long ret;
 913
 914         arg = (unsigned long) compat_ptr(arg);
 915         ret = ncp_ioctl(file, cmd, arg);
 916         return ret;
 917 }
 918 #endif