drivers/staging/ncpfs/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  ioctl.c
   4  *
   5  *  Copyright (C) 1995, 1996 by Volker Lendecke
   6  *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
   7  *  Modified 1998, 1999 Wolfram Pienkoss for NLS
   8  *
   9  */
  10
  11 #include <linux/capability.h>
  12 #include <linux/compat.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/ioctl.h>
  16 #include <linux/time.h>
  17 #include <linux/mm.h>
  18 #include <linux/mount.h>
  19 #include <linux/slab.h>
  20 #include <linux/highuid.h>
  21 #include <linux/vmalloc.h>
  22 #include <linux/sched.h>
  23 #include <linux/cred.h>
  24
  25 #include <linux/uaccess.h>
  26
  27 #include "ncp_fs.h"
  28
  29 /* maximum limit for ncp_objectname_ioctl */
  30 #define NCP_OBJECT_NAME_MAX_LEN 4096
  31 /* maximum limit for ncp_privatedata_ioctl */
  32 #define NCP_PRIVATE_DATA_MAX_LEN 8192
  33 /* maximum negotiable packet size */
  34 #define NCP_PACKET_SIZE_INTERNAL 65536
  35
  36 static int
  37 ncp_get_fs_info(struct ncp_server * server, struct inode *inode,
  38                 struct ncp_fs_info __user *arg)
  39 {
  40         struct ncp_fs_info info;
  41
  42         if (copy_from_user(&info, arg, sizeof(info)))
  43                 return -EFAULT;
  44
  45         if (info.version != NCP_GET_FS_INFO_VERSION) {
  46                 ncp_dbg(1, "info.version invalid: %d\n", info.version);
  47                 return -EINVAL;
  48         }
  49         /* TODO: info.addr = server->m.serv_addr; */
  50         SET_UID(info.mounted_uid, from_kuid_munged(current_user_ns(), server->m.mounted_uid));
  51         info.connection         = server->connection;
  52         info.buffer_size        = server->buffer_size;
  53         info.volume_number      = NCP_FINFO(inode)->volNumber;
  54         info.directory_id       = NCP_FINFO(inode)->DosDirNum;
  55
  56         if (copy_to_user(arg, &info, sizeof(info)))
  57                 return -EFAULT;
  58         return 0;
  59 }
  60
  61 static int
  62 ncp_get_fs_info_v2(struct ncp_server * server, struct inode *inode,
  63                    struct ncp_fs_info_v2 __user * arg)
  64 {
  65         struct ncp_fs_info_v2 info2;
  66
  67         if (copy_from_user(&info2, arg, sizeof(info2)))
  68                 return -EFAULT;
  69
  70         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
  71                 ncp_dbg(1, "info.version invalid: %d\n", info2.version);
  72                 return -EINVAL;
  73         }
  74         info2.mounted_uid   = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
  75         info2.connection    = server->connection;
  76         info2.buffer_size   = server->buffer_size;
  77         info2.volume_number = NCP_FINFO(inode)->volNumber;
  78         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
  79         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
  80
  81         if (copy_to_user(arg, &info2, sizeof(info2)))
  82                 return -EFAULT;
  83         return 0;
  84 }
  85
  86 #ifdef CONFIG_COMPAT
  87 struct compat_ncp_objectname_ioctl
  88 {
  89         s32             auth_type;
  90         u32             object_name_len;
  91         compat_caddr_t  object_name;    /* a userspace data, in most cases user name */
  92 };
  93
  94 struct compat_ncp_fs_info_v2 {
  95         s32 version;
  96         u32 mounted_uid;
  97         u32 connection;
  98         u32 buffer_size;
  99
 100         u32 volume_number;
 101         u32 directory_id;
 102
 103         u32 dummy1;
 104         u32 dummy2;
 105         u32 dummy3;
 106 };
 107
 108 struct compat_ncp_ioctl_request {
 109         u32 function;
 110         u32 size;
 111         compat_caddr_t data;
 112 };
 113
 114 struct compat_ncp_privatedata_ioctl
 115 {
 116         u32             len;
 117         compat_caddr_t  data;           /* ~1000 for NDS */
 118 };
 119
 120 #define NCP_IOC_GET_FS_INFO_V2_32       _IOWR('n', 4, struct compat_ncp_fs_info_v2)
 121 #define NCP_IOC_NCPREQUEST_32           _IOR('n', 1, struct compat_ncp_ioctl_request)
 122 #define NCP_IOC_GETOBJECTNAME_32        _IOWR('n', 9, struct compat_ncp_objectname_ioctl)
 123 #define NCP_IOC_SETOBJECTNAME_32        _IOR('n', 9, struct compat_ncp_objectname_ioctl)
 124 #define NCP_IOC_GETPRIVATEDATA_32       _IOWR('n', 10, struct compat_ncp_privatedata_ioctl)
 125 #define NCP_IOC_SETPRIVATEDATA_32       _IOR('n', 10, struct compat_ncp_privatedata_ioctl)
 126
 127 static int
 128 ncp_get_compat_fs_info_v2(struct ncp_server * server, struct inode *inode,
 129                    struct compat_ncp_fs_info_v2 __user * arg)
 130 {
 131         struct compat_ncp_fs_info_v2 info2;
 132
 133         if (copy_from_user(&info2, arg, sizeof(info2)))
 134                 return -EFAULT;
 135
 136         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
 137                 ncp_dbg(1, "info.version invalid: %d\n", info2.version);
 138                 return -EINVAL;
 139         }
 140         info2.mounted_uid   = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 141         info2.connection    = server->connection;
 142         info2.buffer_size   = server->buffer_size;
 143         info2.volume_number = NCP_FINFO(inode)->volNumber;
 144         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
 145         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
 146
 147         if (copy_to_user(arg, &info2, sizeof(info2)))
 148                 return -EFAULT;
 149         return 0;
 150 }
 151 #endif
 152
 153 #define NCP_IOC_GETMOUNTUID16           _IOW('n', 2, u16)
 154 #define NCP_IOC_GETMOUNTUID32           _IOW('n', 2, u32)
 155 #define NCP_IOC_GETMOUNTUID64           _IOW('n', 2, u64)
 156
 157 #ifdef CONFIG_NCPFS_NLS
 158 /* Here we are select the iocharset and the codepage for NLS.
 159  * Thanks Petr Vandrovec for idea and many hints.
 160  */
 161 static int
 162 ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 163 {
 164         struct ncp_nls_ioctl user;
 165         struct nls_table *codepage;
 166         struct nls_table *iocharset;
 167         struct nls_table *oldset_io;
 168         struct nls_table *oldset_cp;
 169         int utf8;
 170         int err;
 171
 172         if (copy_from_user(&user, arg, sizeof(user)))
 173                 return -EFAULT;
 174
 175         codepage = NULL;
 176         user.codepage[NCP_IOCSNAME_LEN] = 0;
 177         if (!user.codepage[0] || !strcmp(user.codepage, "default"))
 178                 codepage = load_nls_default();
 179         else {
 180                 codepage = load_nls(user.codepage);
 181                 if (!codepage) {
 182                         return -EBADRQC;
 183                 }
 184         }
 185
 186         iocharset = NULL;
 187         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 188         if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
 189                 iocharset = load_nls_default();
 190                 utf8 = 0;
 191         } else if (!strcmp(user.iocharset, "utf8")) {
 192                 iocharset = load_nls_default();
 193                 utf8 = 1;
 194         } else {
 195                 iocharset = load_nls(user.iocharset);
 196                 if (!iocharset) {
 197                         unload_nls(codepage);
 198                         return -EBADRQC;
 199                 }
 200                 utf8 = 0;
 201         }
 202
 203         mutex_lock(&server->root_setup_lock);
 204         if (server->root_setuped) {
 205                 oldset_cp = codepage;
 206                 oldset_io = iocharset;
 207                 err = -EBUSY;
 208         } else {
 209                 if (utf8)
 210                         NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 211                 else
 212                         NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 213                 oldset_cp = server->nls_vol;
 214                 server->nls_vol = codepage;
 215                 oldset_io = server->nls_io;
 216                 server->nls_io = iocharset;
 217                 err = 0;
 218         }
 219         mutex_unlock(&server->root_setup_lock);
 220         unload_nls(oldset_cp);
 221         unload_nls(oldset_io);
 222
 223         return err;
 224 }
 225
 226 static int
 227 ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 228 {
 229         struct ncp_nls_ioctl user;
 230         int len;
 231
 232         memset(&user, 0, sizeof(user));
 233         mutex_lock(&server->root_setup_lock);
 234         if (server->nls_vol && server->nls_vol->charset) {
 235                 len = strlen(server->nls_vol->charset);
 236                 if (len > NCP_IOCSNAME_LEN)
 237                         len = NCP_IOCSNAME_LEN;
 238                 strncpy(user.codepage, server->nls_vol->charset, len);
 239                 user.codepage[len] = 0;
 240         }
 241
 242         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 243                 strcpy(user.iocharset, "utf8");
 244         else if (server->nls_io && server->nls_io->charset) {
 245                 len = strlen(server->nls_io->charset);
 246                 if (len > NCP_IOCSNAME_LEN)
 247                         len = NCP_IOCSNAME_LEN;
 248                 strncpy(user.iocharset, server->nls_io->charset, len);
 249                 user.iocharset[len] = 0;
 250         }
 251         mutex_unlock(&server->root_setup_lock);
 252
 253         if (copy_to_user(arg, &user, sizeof(user)))
 254                 return -EFAULT;
 255         return 0;
 256 }
 257 #endif /* CONFIG_NCPFS_NLS */
 258
 259 static long __ncp_ioctl(struct inode *inode, unsigned int cmd, unsigned long arg)
 260 {
 261         struct ncp_server *server = NCP_SERVER(inode);
 262         int result;
 263         struct ncp_ioctl_request request;
 264         char* bouncebuffer;
 265         void __user *argp = (void __user *)arg;
 266
 267         switch (cmd) {
 268 #ifdef CONFIG_COMPAT
 269         case NCP_IOC_NCPREQUEST_32:
 270 #endif
 271         case NCP_IOC_NCPREQUEST:
 272 #ifdef CONFIG_COMPAT
 273                 if (cmd == NCP_IOC_NCPREQUEST_32) {
 274                         struct compat_ncp_ioctl_request request32;
 275                         if (copy_from_user(&request32, argp, sizeof(request32)))
 276                                 return -EFAULT;
 277                         request.function = request32.function;
 278                         request.size = request32.size;
 279                         request.data = compat_ptr(request32.data);
 280                 } else
 281 #endif
 282                 if (copy_from_user(&request, argp, sizeof(request)))
 283                         return -EFAULT;
 284
 285                 if ((request.function > 255)
 286                     || (request.size >
 287                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
 288                         return -EINVAL;
 289                 }
 290                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
 291                 if (!bouncebuffer)
 292                         return -ENOMEM;
 293                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
 294                         vfree(bouncebuffer);
 295                         return -EFAULT;
 296                 }
 297                 ncp_lock_server(server);
 298
 299                 /* FIXME: We hack around in the server's structures
 300                    here to be able to use ncp_request */
 301
 302                 server->has_subfunction = 0;
 303                 server->current_size = request.size;
 304                 memcpy(server->packet, bouncebuffer, request.size);
 305
 306                 result = ncp_request2(server, request.function,
 307                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
 308                 if (result < 0)
 309                         result = -EIO;
 310                 else
 311                         result = server->reply_size;
 312                 ncp_unlock_server(server);
 313                 ncp_dbg(1, "copy %d bytes\n", result);
 314                 if (result >= 0)
 315                         if (copy_to_user(request.data, bouncebuffer, result))
 316                                 result = -EFAULT;
 317                 vfree(bouncebuffer);
 318                 return result;
 319
 320         case NCP_IOC_CONN_LOGGED_IN:
 321
 322                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
 323                         return -EINVAL;
 324                 mutex_lock(&server->root_setup_lock);
 325                 if (server->root_setuped)
 326                         result = -EBUSY;
 327                 else {
 328                         result = ncp_conn_logged_in(inode->i_sb);
 329                         if (result == 0)
 330                                 server->root_setuped = 1;
 331                 }
 332                 mutex_unlock(&server->root_setup_lock);
 333                 return result;
 334
 335         case NCP_IOC_GET_FS_INFO:
 336                 return ncp_get_fs_info(server, inode, argp);
 337
 338         case NCP_IOC_GET_FS_INFO_V2:
 339                 return ncp_get_fs_info_v2(server, inode, argp);
 340
 341 #ifdef CONFIG_COMPAT
 342         case NCP_IOC_GET_FS_INFO_V2_32:
 343                 return ncp_get_compat_fs_info_v2(server, inode, argp);
 344 #endif
 345         /* we have too many combinations of CONFIG_COMPAT,
 346          * CONFIG_64BIT and CONFIG_UID16, so just handle
 347          * any of the possible ioctls */
 348         case NCP_IOC_GETMOUNTUID16:
 349                 {
 350                         u16 uid;
 351
 352                         SET_UID(uid, from_kuid_munged(current_user_ns(), server->m.mounted_uid));
 353                         if (put_user(uid, (u16 __user *)argp))
 354                                 return -EFAULT;
 355                         return 0;
 356                 }
 357         case NCP_IOC_GETMOUNTUID32:
 358         {
 359                 uid_t uid = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 360                 if (put_user(uid, (u32 __user *)argp))
 361                         return -EFAULT;
 362                 return 0;
 363         }
 364         case NCP_IOC_GETMOUNTUID64:
 365         {
 366                 uid_t uid = from_kuid_munged(current_user_ns(), server->m.mounted_uid);
 367                 if (put_user(uid, (u64 __user *)argp))
 368                         return -EFAULT;
 369                 return 0;
 370         }
 371         case NCP_IOC_GETROOT:
 372                 {
 373                         struct ncp_setroot_ioctl sr;
 374
 375                         result = -EACCES;
 376                         mutex_lock(&server->root_setup_lock);
 377                         if (server->m.mounted_vol[0]) {
 378                                 struct dentry* dentry = inode->i_sb->s_root;
 379
 380                                 if (dentry) {
 381                                         struct inode* s_inode = d_inode(dentry);
 382
 383                                         if (s_inode) {
 384                                                 sr.volNumber = NCP_FINFO(s_inode)->volNumber;
 385                                                 sr.dirEntNum = NCP_FINFO(s_inode)->dirEntNum;
 386                                                 sr.namespace = server->name_space[sr.volNumber];
 387                                                 result = 0;
 388                                         } else
 389                                                 ncp_dbg(1, "d_inode(s_root)==NULL\n");
 390                                 } else
 391                                         ncp_dbg(1, "s_root==NULL\n");
 392                         } else {
 393                                 sr.volNumber = -1;
 394                                 sr.namespace = 0;
 395                                 sr.dirEntNum = 0;
 396                                 result = 0;
 397                         }
 398                         mutex_unlock(&server->root_setup_lock);
 399                         if (!result && copy_to_user(argp, &sr, sizeof(sr)))
 400                                 result = -EFAULT;
 401                         return result;
 402                 }
 403
 404         case NCP_IOC_SETROOT:
 405                 {
 406                         struct ncp_setroot_ioctl sr;
 407                         __u32 vnum;
 408                         __le32 de;
 409                         __le32 dosde;
 410                         struct dentry* dentry;
 411
 412                         if (copy_from_user(&sr, argp, sizeof(sr)))
 413                                 return -EFAULT;
 414                         mutex_lock(&server->root_setup_lock);
 415                         if (server->root_setuped)
 416                                 result = -EBUSY;
 417                         else {
 418                                 if (sr.volNumber < 0) {
 419                                         server->m.mounted_vol[0] = 0;
 420                                         vnum = NCP_NUMBER_OF_VOLUMES;
 421                                         de = 0;
 422                                         dosde = 0;
 423                                         result = 0;
 424                                 } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 425                                         result = -EINVAL;
 426                                 } else if (ncp_mount_subdir(server, sr.volNumber,
 427                                                         sr.namespace, sr.dirEntNum,
 428                                                         &vnum, &de, &dosde)) {
 429                                         result = -ENOENT;
 430                                 } else
 431                                         result = 0;
 432
 433                                 if (result == 0) {
 434                                         dentry = inode->i_sb->s_root;
 435                                         if (dentry) {
 436                                                 struct inode* s_inode = d_inode(dentry);
 437
 438                                                 if (s_inode) {
 439                                                         NCP_FINFO(s_inode)->volNumber = vnum;
 440                                                         NCP_FINFO(s_inode)->dirEntNum = de;
 441                                                         NCP_FINFO(s_inode)->DosDirNum = dosde;
 442                                                         server->root_setuped = 1;
 443                                                 } else {
 444                                                         ncp_dbg(1, "d_inode(s_root)==NULL\n");
 445                                                         result = -EIO;
 446                                                 }
 447                                         } else {
 448                                                 ncp_dbg(1, "s_root==NULL\n");
 449                                                 result = -EIO;
 450                                         }
 451                                 }
 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                                                         return -EINVAL;
 532                                                 if (rqdata.timeout == 0)
 533                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 534                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 535                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 536                                                 break;
 537                                 case NCP_LOCK_LOG:
 538                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 539                                 case NCP_LOCK_CLEAR:
 540                                                 break;
 541                                 default:
 542                                                 return -EINVAL;
 543                         }
 544                         /* locking needs both read and write access */
 545                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 546                         {
 547                                 return result;
 548                         }
 549                         result = -EISDIR;
 550                         if (!S_ISREG(inode->i_mode))
 551                                 goto outrel;
 552                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 553                         {
 554                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 555                                                         NCP_FINFO(inode)->file_handle,
 556                                                         rqdata.offset,
 557                                                         rqdata.length);
 558                                 if (result > 0) result = 0;     /* no such lock */
 559                         }
 560                         else
 561                         {
 562                                 int lockcmd;
 563
 564                                 switch (rqdata.cmd)
 565                                 {
 566                                         case NCP_LOCK_EX:  lockcmd=1; break;
 567                                         case NCP_LOCK_SH:  lockcmd=3; break;
 568                                         default:           lockcmd=0; break;
 569                                 }
 570                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 571                                                         NCP_FINFO(inode)->file_handle,
 572                                                         lockcmd,
 573                                                         rqdata.offset,
 574                                                         rqdata.length,
 575                                                         rqdata.timeout);
 576                                 if (result > 0) result = -EAGAIN;
 577                         }
 578 outrel:
 579                         ncp_inode_close(inode);
 580                         return result;
 581                 }
 582 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 583
 584 #ifdef CONFIG_COMPAT
 585         case NCP_IOC_GETOBJECTNAME_32:
 586                 {
 587                         struct compat_ncp_objectname_ioctl user;
 588                         size_t outl;
 589
 590                         if (copy_from_user(&user, argp, sizeof(user)))
 591                                 return -EFAULT;
 592                         down_read(&server->auth_rwsem);
 593                         user.auth_type = server->auth.auth_type;
 594                         outl = user.object_name_len;
 595                         user.object_name_len = server->auth.object_name_len;
 596                         if (outl > user.object_name_len)
 597                                 outl = user.object_name_len;
 598                         result = 0;
 599                         if (outl) {
 600                                 if (copy_to_user(compat_ptr(user.object_name),
 601                                                  server->auth.object_name,
 602                                                  outl))
 603                                         result = -EFAULT;
 604                         }
 605                         up_read(&server->auth_rwsem);
 606                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 607                                 result = -EFAULT;
 608                         return result;
 609                 }
 610 #endif
 611
 612         case NCP_IOC_GETOBJECTNAME:
 613                 {
 614                         struct ncp_objectname_ioctl user;
 615                         size_t outl;
 616
 617                         if (copy_from_user(&user, argp, sizeof(user)))
 618                                 return -EFAULT;
 619                         down_read(&server->auth_rwsem);
 620                         user.auth_type = server->auth.auth_type;
 621                         outl = user.object_name_len;
 622                         user.object_name_len = server->auth.object_name_len;
 623                         if (outl > user.object_name_len)
 624                                 outl = user.object_name_len;
 625                         result = 0;
 626                         if (outl) {
 627                                 if (copy_to_user(user.object_name,
 628                                                  server->auth.object_name,
 629                                                  outl))
 630                                         result = -EFAULT;
 631                         }
 632                         up_read(&server->auth_rwsem);
 633                         if (!result && copy_to_user(argp, &user, sizeof(user)))
 634                                 result = -EFAULT;
 635                         return result;
 636                 }
 637
 638 #ifdef CONFIG_COMPAT
 639         case NCP_IOC_SETOBJECTNAME_32:
 640 #endif
 641         case NCP_IOC_SETOBJECTNAME:
 642                 {
 643                         struct ncp_objectname_ioctl user;
 644                         void* newname;
 645                         void* oldname;
 646                         size_t oldnamelen;
 647                         void* oldprivate;
 648                         size_t oldprivatelen;
 649
 650 #ifdef CONFIG_COMPAT
 651                         if (cmd == NCP_IOC_SETOBJECTNAME_32) {
 652                                 struct compat_ncp_objectname_ioctl user32;
 653                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 654                                         return -EFAULT;
 655                                 user.auth_type = user32.auth_type;
 656                                 user.object_name_len = user32.object_name_len;
 657                                 user.object_name = compat_ptr(user32.object_name);
 658                         } else
 659 #endif
 660                         if (copy_from_user(&user, argp, sizeof(user)))
 661                                 return -EFAULT;
 662
 663                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 664                                 return -ENOMEM;
 665                         if (user.object_name_len) {
 666                                 newname = memdup_user(user.object_name,
 667                                                       user.object_name_len);
 668                                 if (IS_ERR(newname))
 669                                         return PTR_ERR(newname);
 670                         } else {
 671                                 newname = NULL;
 672                         }
 673                         down_write(&server->auth_rwsem);
 674                         oldname = server->auth.object_name;
 675                         oldnamelen = server->auth.object_name_len;
 676                         oldprivate = server->priv.data;
 677                         oldprivatelen = server->priv.len;
 678                         server->auth.auth_type = user.auth_type;
 679                         server->auth.object_name_len = user.object_name_len;
 680                         server->auth.object_name = newname;
 681                         server->priv.len = 0;
 682                         server->priv.data = NULL;
 683                         up_write(&server->auth_rwsem);
 684                         kfree(oldprivate);
 685                         kfree(oldname);
 686                         return 0;
 687                 }
 688
 689 #ifdef CONFIG_COMPAT
 690         case NCP_IOC_GETPRIVATEDATA_32:
 691 #endif
 692         case NCP_IOC_GETPRIVATEDATA:
 693                 {
 694                         struct ncp_privatedata_ioctl user;
 695                         size_t outl;
 696
 697 #ifdef CONFIG_COMPAT
 698                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 699                                 struct compat_ncp_privatedata_ioctl user32;
 700                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 701                                         return -EFAULT;
 702                                 user.len = user32.len;
 703                                 user.data = compat_ptr(user32.data);
 704                         } else
 705 #endif
 706                         if (copy_from_user(&user, argp, sizeof(user)))
 707                                 return -EFAULT;
 708
 709                         down_read(&server->auth_rwsem);
 710                         outl = user.len;
 711                         user.len = server->priv.len;
 712                         if (outl > user.len) outl = user.len;
 713                         result = 0;
 714                         if (outl) {
 715                                 if (copy_to_user(user.data,
 716                                                  server->priv.data,
 717                                                  outl))
 718                                         result = -EFAULT;
 719                         }
 720                         up_read(&server->auth_rwsem);
 721                         if (result)
 722                                 return result;
 723 #ifdef CONFIG_COMPAT
 724                         if (cmd == NCP_IOC_GETPRIVATEDATA_32) {
 725                                 struct compat_ncp_privatedata_ioctl user32;
 726                                 user32.len = user.len;
 727                                 user32.data = (unsigned long) user.data;
 728                                 if (copy_to_user(argp, &user32, sizeof(user32)))
 729                                         return -EFAULT;
 730                         } else
 731 #endif
 732                         if (copy_to_user(argp, &user, sizeof(user)))
 733                                 return -EFAULT;
 734
 735                         return 0;
 736                 }
 737
 738 #ifdef CONFIG_COMPAT
 739         case NCP_IOC_SETPRIVATEDATA_32:
 740 #endif
 741         case NCP_IOC_SETPRIVATEDATA:
 742                 {
 743                         struct ncp_privatedata_ioctl user;
 744                         void* new;
 745                         void* old;
 746                         size_t oldlen;
 747
 748 #ifdef CONFIG_COMPAT
 749                         if (cmd == NCP_IOC_SETPRIVATEDATA_32) {
 750                                 struct compat_ncp_privatedata_ioctl user32;
 751                                 if (copy_from_user(&user32, argp, sizeof(user32)))
 752                                         return -EFAULT;
 753                                 user.len = user32.len;
 754                                 user.data = compat_ptr(user32.data);
 755                         } else
 756 #endif
 757                         if (copy_from_user(&user, argp, sizeof(user)))
 758                                 return -EFAULT;
 759
 760                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 761                                 return -ENOMEM;
 762                         if (user.len) {
 763                                 new = memdup_user(user.data, user.len);
 764                                 if (IS_ERR(new))
 765                                         return PTR_ERR(new);
 766                         } else {
 767                                 new = NULL;
 768                         }
 769                         down_write(&server->auth_rwsem);
 770                         old = server->priv.data;
 771                         oldlen = server->priv.len;
 772                         server->priv.len = user.len;
 773                         server->priv.data = new;
 774                         up_write(&server->auth_rwsem);
 775                         kfree(old);
 776                         return 0;
 777                 }
 778
 779 #ifdef CONFIG_NCPFS_NLS
 780         case NCP_IOC_SETCHARSETS:
 781                 return ncp_set_charsets(server, argp);
 782
 783         case NCP_IOC_GETCHARSETS:
 784                 return ncp_get_charsets(server, argp);
 785
 786 #endif /* CONFIG_NCPFS_NLS */
 787
 788         case NCP_IOC_SETDENTRYTTL:
 789                 {
 790                         u_int32_t user;
 791
 792                         if (copy_from_user(&user, argp, sizeof(user)))
 793                                 return -EFAULT;
 794                         /* 20 secs at most... */
 795                         if (user > 20000)
 796                                 return -EINVAL;
 797                         user = (user * HZ) / 1000;
 798                         atomic_set(&server->dentry_ttl, user);
 799                         return 0;
 800                 }
 801
 802         case NCP_IOC_GETDENTRYTTL:
 803                 {
 804                         u_int32_t user = (atomic_read(&server->dentry_ttl) * 1000) / HZ;
 805                         if (copy_to_user(argp, &user, sizeof(user)))
 806                                 return -EFAULT;
 807                         return 0;
 808                 }
 809
 810         }
 811         return -EINVAL;
 812 }
 813
 814 long ncp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 815 {
 816         struct inode *inode = file_inode(filp);
 817         struct ncp_server *server = NCP_SERVER(inode);
 818         kuid_t uid = current_uid();
 819         int need_drop_write = 0;
 820         long ret;
 821
 822         switch (cmd) {
 823         case NCP_IOC_SETCHARSETS:
 824         case NCP_IOC_CONN_LOGGED_IN:
 825         case NCP_IOC_SETROOT:
 826                 if (!capable(CAP_SYS_ADMIN)) {
 827                         ret = -EPERM;
 828                         goto out;
 829                 }
 830                 break;
 831         }
 832         if (!uid_eq(server->m.mounted_uid, uid)) {
 833                 switch (cmd) {
 834                 /*
 835                  * Only mount owner can issue these ioctls.  Information
 836                  * necessary to authenticate to other NDS servers are
 837                  * stored here.
 838                  */
 839                 case NCP_IOC_GETOBJECTNAME:
 840                 case NCP_IOC_SETOBJECTNAME:
 841                 case NCP_IOC_GETPRIVATEDATA:
 842                 case NCP_IOC_SETPRIVATEDATA:
 843 #ifdef CONFIG_COMPAT
 844                 case NCP_IOC_GETOBJECTNAME_32:
 845                 case NCP_IOC_SETOBJECTNAME_32:
 846                 case NCP_IOC_GETPRIVATEDATA_32:
 847                 case NCP_IOC_SETPRIVATEDATA_32:
 848 #endif
 849                         ret = -EACCES;
 850                         goto out;
 851                 /*
 852                  * These require write access on the inode if user id
 853                  * does not match.  Note that they do not write to the
 854                  * file...  But old code did mnt_want_write, so I keep
 855                  * it as is.  Of course not for mountpoint owner, as
 856                  * that breaks read-only mounts altogether as ncpmount
 857                  * needs working NCP_IOC_NCPREQUEST and
 858                  * NCP_IOC_GET_FS_INFO.  Some of these codes (setdentryttl,
 859                  * signinit, setsignwanted) should be probably restricted
 860                  * to owner only, or even more to CAP_SYS_ADMIN).
 861                  */
 862                 case NCP_IOC_GET_FS_INFO:
 863                 case NCP_IOC_GET_FS_INFO_V2:
 864                 case NCP_IOC_NCPREQUEST:
 865                 case NCP_IOC_SETDENTRYTTL:
 866                 case NCP_IOC_SIGN_INIT:
 867                 case NCP_IOC_LOCKUNLOCK:
 868                 case NCP_IOC_SET_SIGN_WANTED:
 869 #ifdef CONFIG_COMPAT
 870                 case NCP_IOC_GET_FS_INFO_V2_32:
 871                 case NCP_IOC_NCPREQUEST_32:
 872 #endif
 873                         ret = mnt_want_write_file(filp);
 874                         if (ret)
 875                                 goto out;
 876                         need_drop_write = 1;
 877                         ret = inode_permission(inode, MAY_WRITE);
 878                         if (ret)
 879                                 goto outDropWrite;
 880                         break;
 881                 /*
 882                  * Read access required.
 883                  */
 884                 case NCP_IOC_GETMOUNTUID16:
 885                 case NCP_IOC_GETMOUNTUID32:
 886                 case NCP_IOC_GETMOUNTUID64:
 887                 case NCP_IOC_GETROOT:
 888                 case NCP_IOC_SIGN_WANTED:
 889                         ret = inode_permission(inode, MAY_READ);
 890                         if (ret)
 891                                 goto out;
 892                         break;
 893                 /*
 894                  * Anybody can read these.
 895                  */
 896                 case NCP_IOC_GETCHARSETS:
 897                 case NCP_IOC_GETDENTRYTTL:
 898                 default:
 899                 /* Three codes below are protected by CAP_SYS_ADMIN above. */
 900                 case NCP_IOC_SETCHARSETS:
 901                 case NCP_IOC_CONN_LOGGED_IN:
 902                 case NCP_IOC_SETROOT:
 903                         break;
 904                 }
 905         }
 906         ret = __ncp_ioctl(inode, cmd, arg);
 907 outDropWrite:
 908         if (need_drop_write)
 909                 mnt_drop_write_file(filp);
 910 out:
 911         return ret;
 912 }
 913
 914 #ifdef CONFIG_COMPAT
 915 long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 916 {
 917         long ret;
 918
 919         arg = (unsigned long) compat_ptr(arg);
 920         ret = ncp_ioctl(file, cmd, arg);
 921         return ret;
 922 }
 923 #endif