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 #include <linux/cred.h>
  23
  24 #include <linux/uaccess.h>
  25
  26 #include "ncp_fs.h"
  27
  28 /* maximum limit for ncp_objectname_ioctl */
  29 #define NCP_OBJECT_NAME_MAX_LEN 4096
  30 /* maximum limit for ncp_privatedata_ioctl */
  31 #define NCP_PRIVATE_DATA_MAX_LEN 8192
  32 /* maximum negotiable packet size */
  33 #define NCP_PACKET_SIZE_INTERNAL 65536
  34
  35 static int
  36 ncp_get_fs_info(struct ncp_server * server, struct inode *inode,
  37                 struct ncp_fs_info __user *arg)
  38 {
  39         struct ncp_fs_info info;
  40
  41         if (copy_from_user(&info, arg, sizeof(info)))
  42                 return -EFAULT;
  43
  44         if (info.version != NCP_GET_FS_INFO_VERSION) {
  45                 ncp_dbg(1, "info.version invalid: %d\n", info.version);
  46                 return -EINVAL;
  47         }
  48         /* TODO: info.addr = server->m.serv_addr; */
  49         SET_UID(info.mounted_uid, from_kuid_munged(current_user_ns(), server->m.mounted_uid));
  50         info.connection         = server->connection;
  51         info.buffer_size        = server->buffer_size;
  52         info.volume_number      = NCP_FINFO(inode)->volNumber;
  53         info.directory_id       = NCP_FINFO(inode)->DosDirNum;
  54
  55         if (copy_to_user(arg, &info, sizeof(info)))
  56                 return -EFAULT;
  57         return 0;
  58 }
  59
  60 static int
  61 ncp_get_fs_info_v2(struct ncp_server * server, struct inode *inode,
  62                    struct ncp_fs_info_v2 __user * arg)
  63 {
  64         struct ncp_fs_info_v2 info2;
  65
  66         if (copy_from_user(&info2, arg, sizeof(info2)))
  67                 return -EFAULT;
  68
  69         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
  70                 ncp_dbg(1, "info.version invalid: %d\n", info2.version);
  71                 return -EINVAL;
  72         }
  73         info2.mounted_uid   = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
  74         info2.connection    = server->connection;
  75         info2.buffer_size   = server->buffer_size;
  76         info2.volume_number = NCP_FINFO(inode)->volNumber;
  77         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
  78         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
  79
  80         if (copy_to_user(arg, &info2, sizeof(info2)))
  81                 return -EFAULT;
  82         return 0;
  83 }
  84
  85 #ifdef CONFIG_COMPAT
  86 struct compat_ncp_objectname_ioctl
  87 {
  88         s32             auth_type;
  89         u32             object_name_len;
  90         compat_caddr_t  object_name;    /* a userspace data, in most cases user name */
  91 };
  92
  93 struct compat_ncp_fs_info_v2 {
  94         s32 version;
  95         u32 mounted_uid;
  96         u32 connection;
  97         u32 buffer_size;
  98
  99         u32 volume_number;
 100         u32 directory_id;
 101
 102         u32 dummy1;
 103         u32 dummy2;
 104         u32 dummy3;
 105 };
 106
 107 struct compat_ncp_ioctl_request {
 108         u32 function;
 109         u32 size;
 110         compat_caddr_t data;
 111 };
 112
 113 struct compat_ncp_privatedata_ioctl
 114 {
 115         u32             len;
 116         compat_caddr_t  data;           /* ~1000 for NDS */
 117 };
 118
 119 #define NCP_IOC_GET_FS_INFO_V2_32       _IOWR('n', 4, struct compat_ncp_fs_info_v2)
 120 #define NCP_IOC_NCPREQUEST_32           _IOR('n', 1, struct compat_ncp_ioctl_request)
 121 #define NCP_IOC_GETOBJECTNAME_32        _IOWR('n', 9, struct compat_ncp_objectname_ioctl)
 122 #define NCP_IOC_SETOBJECTNAME_32        _IOR('n', 9, struct compat_ncp_objectname_ioctl)
 123 #define NCP_IOC_GETPRIVATEDATA_32       _IOWR('n', 10, struct compat_ncp_privatedata_ioctl)
 124 #define NCP_IOC_SETPRIVATEDATA_32       _IOR('n', 10, struct compat_ncp_privatedata_ioctl)
 125
 126 static int
 127 ncp_get_compat_fs_info_v2(struct ncp_server * server, struct inode *inode,
 128                    struct compat_ncp_fs_info_v2 __user * arg)
 129 {
 130         struct compat_ncp_fs_info_v2 info2;
 131
 132         if (copy_from_user(&info2, arg, sizeof(info2)))
 133                 return -EFAULT;
 134
 135         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
 136                 ncp_dbg(1, "info.version invalid: %d\n", info2.version);
 137                 return -EINVAL;
 138         }
 139         info2.mounted_uid   = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 140         info2.connection    = server->connection;
 141         info2.buffer_size   = server->buffer_size;
 142         info2.volume_number = NCP_FINFO(inode)->volNumber;
 143         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
 144         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
 145
 146         if (copy_to_user(arg, &info2, sizeof(info2)))
 147                 return -EFAULT;
 148         return 0;
 149 }
 150 #endif
 151
 152 #define NCP_IOC_GETMOUNTUID16           _IOW('n', 2, u16)
 153 #define NCP_IOC_GETMOUNTUID32           _IOW('n', 2, u32)
 154 #define NCP_IOC_GETMOUNTUID64           _IOW('n', 2, u64)
 155
 156 #ifdef CONFIG_NCPFS_NLS
 157 /* Here we are select the iocharset and the codepage for NLS.
 158  * Thanks Petr Vandrovec for idea and many hints.
 159  */
 160 static int
 161 ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 162 {
 163         struct ncp_nls_ioctl user;
 164         struct nls_table *codepage;
 165         struct nls_table *iocharset;
 166         struct nls_table *oldset_io;
 167         struct nls_table *oldset_cp;
 168         int utf8;
 169         int err;
 170
 171         if (copy_from_user(&user, arg, sizeof(user)))
 172                 return -EFAULT;
 173
 174         codepage = NULL;
 175         user.codepage[NCP_IOCSNAME_LEN] = 0;
 176         if (!user.codepage[0] || !strcmp(user.codepage, "default"))
 177                 codepage = load_nls_default();
 178         else {
 179                 codepage = load_nls(user.codepage);
 180                 if (!codepage) {
 181                         return -EBADRQC;
 182                 }
 183         }
 184
 185         iocharset = NULL;
 186         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 187         if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
 188                 iocharset = load_nls_default();
 189                 utf8 = 0;
 190         } else if (!strcmp(user.iocharset, "utf8")) {
 191                 iocharset = load_nls_default();
 192                 utf8 = 1;
 193         } else {
 194                 iocharset = load_nls(user.iocharset);
 195                 if (!iocharset) {
 196                         unload_nls(codepage);
 197                         return -EBADRQC;
 198                 }
 199                 utf8 = 0;
 200         }
 201
 202         mutex_lock(&server->root_setup_lock);
 203         if (server->root_setuped) {
 204                 oldset_cp = codepage;
 205                 oldset_io = iocharset;
 206                 err = -EBUSY;
 207         } else {
 208                 if (utf8)
 209                         NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 210                 else
 211                         NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 212                 oldset_cp = server->nls_vol;
 213                 server->nls_vol = codepage;
 214                 oldset_io = server->nls_io;
 215                 server->nls_io = iocharset;
 216                 err = 0;
 217         }
 218         mutex_unlock(&server->root_setup_lock);
 219         unload_nls(oldset_cp);
 220         unload_nls(oldset_io);
 221
 222         return err;
 223 }
 224
 225 static int
 226 ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 227 {
 228         struct ncp_nls_ioctl user;
 229         int len;
 230
 231         memset(&user, 0, sizeof(user));
 232         mutex_lock(&server->root_setup_lock);
 233         if (server->nls_vol && server->nls_vol->charset) {
 234                 len = strlen(server->nls_vol->charset);
 235                 if (len > NCP_IOCSNAME_LEN)
 236                         len = NCP_IOCSNAME_LEN;
 237                 strncpy(user.codepage, server->nls_vol->charset, len);
 238                 user.codepage[len] = 0;
 239         }
 240
 241         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 242                 strcpy(user.iocharset, "utf8");
 243         else if (server->nls_io && server->nls_io->charset) {
 244                 len = strlen(server->nls_io->charset);
 245                 if (len > NCP_IOCSNAME_LEN)
 246                         len = NCP_IOCSNAME_LEN;
 247                 strncpy(user.iocharset, server->nls_io->charset, len);
 248                 user.iocharset[len] = 0;
 249         }
 250         mutex_unlock(&server->root_setup_lock);
 251
 252         if (copy_to_user(arg, &user, sizeof(user)))
 253                 return -EFAULT;
 254         return 0;
 255 }
 256 #endif /* CONFIG_NCPFS_NLS */
 257
 258 static long __ncp_ioctl(struct inode *inode, unsigned int cmd, unsigned long arg)
 259 {
 260         struct ncp_server *server = NCP_SERVER(inode);
 261         int result;
 262         struct ncp_ioctl_request request;
 263         char* bouncebuffer;
 264         void __user *argp = (void __user *)arg;
 265
 266         switch (cmd) {
 267 #ifdef CONFIG_COMPAT
 268         case NCP_IOC_NCPREQUEST_32:
 269 #endif
 270         case NCP_IOC_NCPREQUEST:
 271 #ifdef CONFIG_COMPAT
 272                 if (cmd == NCP_IOC_NCPREQUEST_32) {
 273                         struct compat_ncp_ioctl_request request32;
 274                         if (copy_from_user(&request32, argp, sizeof(request32)))
 275                                 return -EFAULT;
 276                         request.function = request32.function;
 277                         request.size = request32.size;
 278                         request.data = compat_ptr(request32.data);
 279                 } else
 280 #endif
 281                 if (copy_from_user(&request, argp, sizeof(request)))
 282                         return -EFAULT;
 283
 284                 if ((request.function > 255)
 285                     || (request.size >
 286                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
 287                         return -EINVAL;
 288                 }
 289                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
 290                 if (!bouncebuffer)
 291                         return -ENOMEM;
 292                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
 293                         vfree(bouncebuffer);
 294                         return -EFAULT;
 295                 }
 296                 ncp_lock_server(server);
 297
 298                 /* FIXME: We hack around in the server's structures
 299                    here to be able to use ncp_request */
 300
 301                 server->has_subfunction = 0;
 302                 server->current_size = request.size;
 303                 memcpy(server->packet, bouncebuffer, request.size);
 304
 305                 result = ncp_request2(server, request.function,
 306                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
 307                 if (result < 0)
 308                         result = -EIO;
 309                 else
 310                         result = server->reply_size;
 311                 ncp_unlock_server(server);
 312                 ncp_dbg(1, "copy %d bytes\n", 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 = d_inode(dentry);
 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                                                 ncp_dbg(1, "d_inode(s_root)==NULL\n");
 389                                 } else
 390                                         ncp_dbg(1, "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 = d_inode(dentry);
 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                                                         ncp_dbg(1, "d_inode(s_root)==NULL\n");
 444                                                         result = -EIO;
 445                                                 }
 446                                         } else {
 447                                                 ncp_dbg(1, "s_root==NULL\n");
 448                                                 result = -EIO;
 449                                         }
 450                                 }
 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                                                         return -EINVAL;
 531                                                 if (rqdata.timeout == 0)
 532                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 533                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 534                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 535                                                 break;
 536                                 case NCP_LOCK_LOG:
 537                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 538                                 case NCP_LOCK_CLEAR:
 539                                                 break;
 540                                 default:
 541                                                 return -EINVAL;
 542                         }
 543                         /* locking needs both read and write access */
 544                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 545                         {
 546                                 return result;
 547                         }
 548                         result = -EISDIR;
 549                         if (!S_ISREG(inode->i_mode))
 550                                 goto outrel;
 551                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 552                         {
 553                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 554                                                         NCP_FINFO(inode)->file_handle,
 555                                                         rqdata.offset,
 556                                                         rqdata.length);
 557                                 if (result > 0) result = 0;     /* no such lock */
 558                         }
 559                         else
 560                         {
 561                                 int lockcmd;
 562
 563                                 switch (rqdata.cmd)
 564                                 {
 565                                         case NCP_LOCK_EX:  lockcmd=1; break;
 566                                         case NCP_LOCK_SH:  lockcmd=3; break;
 567                                         default:           lockcmd=0; break;
 568                                 }
 569                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 570                                                         NCP_FINFO(inode)->file_handle,
 571                                                         lockcmd,
 572                                                         rqdata.offset,
 573                                                         rqdata.length,
 574                                                         rqdata.timeout);
 575                                 if (result > 0) result = -EAGAIN;
 576                         }
 577 outrel:
 578                         ncp_inode_close(inode);
 579                         return result;
 580                 }
 581 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 582
 583 #ifdef CONFIG_COMPAT
 584         case NCP_IOC_GETOBJECTNAME_32:
 585                 {
 586                         struct compat_ncp_objectname_ioctl user;
 587                         size_t outl;
 588
 589                         if (copy_from_user(&user, argp, sizeof(user)))
 590                                 return -EFAULT;
 591                         down_read(&server->auth_rwsem);
 592                         user.auth_type = server->auth.auth_type;
 593                         outl = user.object_name_len;
 594                         user.object_name_len = server->auth.object_name_len;
 595                         if (outl > user.object_name_len)
 596                                 outl = user.object_name_len;
 597                         result = 0;
 598                         if (outl) {
 599                                 if (copy_to_user(compat_ptr(user.object_name),
 600                                                  server->auth.object_name,
 601                                                  outl))
 602                                         result = -EFAULT;
 603                         }
 604                         up_read(&server->auth_rwsem);
 605                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 606                                 result = -EFAULT;
 607                         return result;
 608                 }
 609 #endif
 610
 611         case NCP_IOC_GETOBJECTNAME:
 612                 {
 613                         struct ncp_objectname_ioctl user;
 614                         size_t outl;
 615
 616                         if (copy_from_user(&user, argp, sizeof(user)))
 617                                 return -EFAULT;
 618                         down_read(&server->auth_rwsem);
 619                         user.auth_type = server->auth.auth_type;
 620                         outl = user.object_name_len;
 621                         user.object_name_len = server->auth.object_name_len;
 622                         if (outl > user.object_name_len)
 623                                 outl = user.object_name_len;
 624                         result = 0;
 625                         if (outl) {
 626                                 if (copy_to_user(user.object_name,
 627                                                  server->auth.object_name,
 628                                                  outl))
 629                                         result = -EFAULT;
 630                         }
 631                         up_read(&server->auth_rwsem);
 632                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 633                                 result = -EFAULT;
 634                         return result;
 635                 }
 636
 637 #ifdef CONFIG_COMPAT
 638         case NCP_IOC_SETOBJECTNAME_32:
 639 #endif
 640         case NCP_IOC_SETOBJECTNAME:
 641                 {
 642                         struct ncp_objectname_ioctl user;
 643                         void* newname;
 644                         void* oldname;
 645                         size_t oldnamelen;
 646                         void* oldprivate;
 647                         size_t oldprivatelen;
 648
 649 #ifdef CONFIG_COMPAT
 650                         if (cmd == NCP_IOC_SETOBJECTNAME_32) {
 651                                 struct compat_ncp_objectname_ioctl user32;
 652                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 653                                         return -EFAULT;
 654                                 user.auth_type = user32.auth_type;
 655                                 user.object_name_len = user32.object_name_len;
 656                                 user.object_name = compat_ptr(user32.object_name);
 657                         } else
 658 #endif
 659                         if (copy_from_user(&user, argp, sizeof(user)))
 660                                 return -EFAULT;
 661
 662                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 663                                 return -ENOMEM;
 664                         if (user.object_name_len) {
 665                                 newname = memdup_user(user.object_name,
 666                                                       user.object_name_len);
 667                                 if (IS_ERR(newname))
 668                                         return PTR_ERR(newname);
 669                         } else {
 670                                 newname = NULL;
 671                         }
 672                         down_write(&server->auth_rwsem);
 673                         oldname = server->auth.object_name;
 674                         oldnamelen = server->auth.object_name_len;
 675                         oldprivate = server->priv.data;
 676                         oldprivatelen = server->priv.len;
 677                         server->auth.auth_type = user.auth_type;
 678                         server->auth.object_name_len = user.object_name_len;
 679                         server->auth.object_name = newname;
 680                         server->priv.len = 0;
 681                         server->priv.data = NULL;
 682                         up_write(&server->auth_rwsem);
 683                         kfree(oldprivate);
 684                         kfree(oldname);
 685                         return 0;
 686                 }
 687
 688 #ifdef CONFIG_COMPAT
 689         case NCP_IOC_GETPRIVATEDATA_32:
 690 #endif
 691         case NCP_IOC_GETPRIVATEDATA:
 692                 {
 693                         struct ncp_privatedata_ioctl user;
 694                         size_t outl;
 695
 696 #ifdef CONFIG_COMPAT
 697                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 698                                 struct compat_ncp_privatedata_ioctl user32;
 699                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 700                                         return -EFAULT;
 701                                 user.len = user32.len;
 702                                 user.data = compat_ptr(user32.data);
 703                         } else
 704 #endif
 705                         if (copy_from_user(&user, argp, sizeof(user)))
 706                                 return -EFAULT;
 707
 708                         down_read(&server->auth_rwsem);
 709                         outl = user.len;
 710                         user.len = server->priv.len;
 711                         if (outl > user.len) outl = user.len;
 712                         result = 0;
 713                         if (outl) {
 714                                 if (copy_to_user(user.data,
 715                                                  server->priv.data,
 716                                                  outl))
 717                                         result = -EFAULT;
 718                         }
 719                         up_read(&server->auth_rwsem);
 720                         if (result)
 721                                 return result;
 722 #ifdef CONFIG_COMPAT
 723                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 724                                 struct compat_ncp_privatedata_ioctl user32;
 725                                 user32.len = user.len;
 726                                 user32.data = (unsigned long) user.data;
 727                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 728                                         return -EFAULT;
 729                         } else
 730 #endif
 731                         if (copy_to_user(argp, &user, sizeof(user)))
 732                                 return -EFAULT;
 733
 734                         return 0;
 735                 }
 736
 737 #ifdef CONFIG_COMPAT
 738         case NCP_IOC_SETPRIVATEDATA_32:
 739 #endif
 740         case NCP_IOC_SETPRIVATEDATA:
 741                 {
 742                         struct ncp_privatedata_ioctl user;
 743                         void* new;
 744                         void* old;
 745                         size_t oldlen;
 746
 747 #ifdef CONFIG_COMPAT
 748                         if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
 749                                 struct compat_ncp_privatedata_ioctl user32;
 750                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 751                                         return -EFAULT;
 752                                 user.len = user32.len;
 753                                 user.data = compat_ptr(user32.data);
 754                         } else
 755 #endif
 756                         if (copy_from_user(&user, argp, sizeof(user)))
 757                                 return -EFAULT;
 758
 759                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 760                                 return -ENOMEM;
 761                         if (user.len) {
 762                                 new = memdup_user(user.data, user.len);
 763                                 if (IS_ERR(new))
 764                                         return PTR_ERR(new);
 765                         } else {
 766                                 new = NULL;
 767                         }
 768                         down_write(&server->auth_rwsem);
 769                         old = server->priv.data;
 770                         oldlen = server->priv.len;
 771                         server->priv.len = user.len;
 772                         server->priv.data = new;
 773                         up_write(&server->auth_rwsem);
 774                         kfree(old);
 775                         return 0;
 776                 }
 777
 778 #ifdef CONFIG_NCPFS_NLS
 779         case NCP_IOC_SETCHARSETS:
 780                 return ncp_set_charsets(server, argp);
 781
 782         case NCP_IOC_GETCHARSETS:
 783                 return ncp_get_charsets(server, argp);
 784
 785 #endif /* CONFIG_NCPFS_NLS */
 786
 787         case NCP_IOC_SETDENTRYTTL:
 788                 {
 789                         u_int32_t user;
 790
 791                         if (copy_from_user(&user, argp, sizeof(user)))
 792                                 return -EFAULT;
 793                         /* 20 secs at most... */
 794                         if (user > 20000)
 795                                 return -EINVAL;
 796                         user = (user * HZ) / 1000;
 797                         atomic_set(&server->dentry_ttl, user);
 798                         return 0;
 799                 }
 800
 801         case NCP_IOC_GETDENTRYTTL:
 802                 {
 803                         u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ;
 804                         if (copy_to_user(argp, &user, sizeof(user)))
 805                                 return -EFAULT;
 806                         return 0;
 807                 }
 808
 809         }
 810         return -EINVAL;
 811 }
 812
 813 long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 814 {
 815         struct inode *inode = file_inode(filp);
 816         struct ncp_server *server = NCP_SERVER(inode);
 817         kuid_t uid = current_uid();
 818         int need_drop_write = 0;
 819         long ret;
 820
 821         switch (cmd) {
 822         case NCP_IOC_SETCHARSETS:
 823         case NCP_IOC_CONN_LOGGED_IN:
 824         case NCP_IOC_SETROOT:
 825                 if (!capable(CAP_SYS_ADMIN)) {
 826                         ret = -EPERM;
 827                         goto out;
 828                 }
 829                 break;
 830         }
 831         if (!uid_eq(server->m.mounted_uid, uid)) {
 832                 switch (cmd) {
 833                 /*
 834                  * Only mount owner can issue these ioctls.  Information
 835                  * necessary to authenticate to other NDS servers are
 836                  * stored here.
 837                  */
 838                 case NCP_IOC_GETOBJECTNAME:
 839                 case NCP_IOC_SETOBJECTNAME:
 840                 case NCP_IOC_GETPRIVATEDATA:
 841                 case NCP_IOC_SETPRIVATEDATA:
 842 #ifdef CONFIG_COMPAT
 843                 case NCP_IOC_GETOBJECTNAME_32:
 844                 case NCP_IOC_SETOBJECTNAME_32:
 845                 case NCP_IOC_GETPRIVATEDATA_32:
 846                 case NCP_IOC_SETPRIVATEDATA_32:
 847 #endif
 848                         ret = -EACCES;
 849                         goto out;
 850                 /*
 851                  * These require write access on the inode if user id
 852                  * does not match.  Note that they do not write to the
 853                  * file...  But old code did mnt_want_write, so I keep
 854                  * it as is.  Of course not for mountpoint owner, as
 855                  * that breaks read-only mounts altogether as ncpmount
 856                  * needs working NCP_IOC_NCPREQUEST and
 857                  * NCP_IOC_GET_FS_INFO.  Some of these codes (setdentryttl,
 858                  * signinit, setsignwanted) should be probably restricted
 859                  * to owner only, or even more to CAP_SYS_ADMIN).
 860                  */
 861                 case NCP_IOC_GET_FS_INFO:
 862                 case NCP_IOC_GET_FS_INFO_V2:
 863                 case NCP_IOC_NCPREQUEST:
 864                 case NCP_IOC_SETDENTRYTTL:
 865                 case NCP_IOC_SIGN_INIT:
 866                 case NCP_IOC_LOCKUNLOCK:
 867                 case NCP_IOC_SET_SIGN_WANTED:
 868 #ifdef CONFIG_COMPAT
 869                 case NCP_IOC_GET_FS_INFO_V2_32:
 870                 case NCP_IOC_NCPREQUEST_32:
 871 #endif
 872                         ret = mnt_want_write_file(filp);
 873                         if (ret)
 874                                 goto out;
 875                         need_drop_write = 1;
 876                         ret = inode_permission(inode, MAY_WRITE);
 877                         if (ret)
 878                                 goto outDropWrite;
 879                         break;
 880                 /*
 881                  * Read access required.
 882                  */
 883                 case NCP_IOC_GETMOUNTUID16:
 884                 case NCP_IOC_GETMOUNTUID32:
 885                 case NCP_IOC_GETMOUNTUID64:
 886                 case NCP_IOC_GETROOT:
 887                 case NCP_IOC_SIGN_WANTED:
 888                         ret = inode_permission(inode, MAY_READ);
 889                         if (ret)
 890                                 goto out;
 891                         break;
 892                 /*
 893                  * Anybody can read these.
 894                  */
 895                 case NCP_IOC_GETCHARSETS:
 896                 case NCP_IOC_GETDENTRYTTL:
 897                 default:
 898                 /* Three codes below are protected by CAP_SYS_ADMIN above. */
 899                 case NCP_IOC_SETCHARSETS:
 900                 case NCP_IOC_CONN_LOGGED_IN:
 901                 case NCP_IOC_SETROOT:
 902                         break;
 903                 }
 904         }
 905         ret = __ncp_ioctl(inode, cmd, arg);
 906 outDropWrite:
 907         if (need_drop_write)
 908                 mnt_drop_write_file(filp);
 909 out:
 910         return ret;
 911 }
 912
 913 #ifdef CONFIG_COMPAT
 914 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 915 {
 916         long ret;
 917
 918         arg = (unsigned long) compat_ptr(arg);
 919         ret = ncp_ioctl(file, cmd, arg);
 920         return ret;
 921 }
 922 #endif