linux/fs/cifs/smb1ops.c
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   1/*
   2 *  SMB1 (CIFS) version specific operations
   3 *
   4 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   5 *
   6 *  This library is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License v2 as published
   8 *  by the Free Software Foundation.
   9 *
  10 *  This library is distributed in the hope that it will be useful,
  11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13 *  the GNU Lesser General Public License for more details.
  14 *
  15 *  You should have received a copy of the GNU Lesser General Public License
  16 *  along with this library; if not, write to the Free Software
  17 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 */
  19
  20#include <linux/pagemap.h>
  21#include <linux/vfs.h>
  22#include "cifsglob.h"
  23#include "cifsproto.h"
  24#include "cifs_debug.h"
  25#include "cifspdu.h"
  26
  27/*
  28 * An NT cancel request header looks just like the original request except:
  29 *
  30 * The Command is SMB_COM_NT_CANCEL
  31 * The WordCount is zeroed out
  32 * The ByteCount is zeroed out
  33 *
  34 * This function mangles an existing request buffer into a
  35 * SMB_COM_NT_CANCEL request and then sends it.
  36 */
  37static int
  38send_nt_cancel(struct TCP_Server_Info *server, void *buf,
  39               struct mid_q_entry *mid)
  40{
  41        int rc = 0;
  42        struct smb_hdr *in_buf = (struct smb_hdr *)buf;
  43
  44        /* -4 for RFC1001 length and +2 for BCC field */
  45        in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4  + 2);
  46        in_buf->Command = SMB_COM_NT_CANCEL;
  47        in_buf->WordCount = 0;
  48        put_bcc(0, in_buf);
  49
  50        mutex_lock(&server->srv_mutex);
  51        rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
  52        if (rc) {
  53                mutex_unlock(&server->srv_mutex);
  54                return rc;
  55        }
  56
  57        /*
  58         * The response to this call was already factored into the sequence
  59         * number when the call went out, so we must adjust it back downward
  60         * after signing here.
  61         */
  62        --server->sequence_number;
  63        rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
  64        if (rc < 0)
  65                server->sequence_number--;
  66
  67        mutex_unlock(&server->srv_mutex);
  68
  69        cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
  70                 get_mid(in_buf), rc);
  71
  72        return rc;
  73}
  74
  75static bool
  76cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
  77{
  78        return ob1->fid.netfid == ob2->fid.netfid;
  79}
  80
  81static unsigned int
  82cifs_read_data_offset(char *buf)
  83{
  84        READ_RSP *rsp = (READ_RSP *)buf;
  85        return le16_to_cpu(rsp->DataOffset);
  86}
  87
  88static unsigned int
  89cifs_read_data_length(char *buf)
  90{
  91        READ_RSP *rsp = (READ_RSP *)buf;
  92        return (le16_to_cpu(rsp->DataLengthHigh) << 16) +
  93               le16_to_cpu(rsp->DataLength);
  94}
  95
  96static struct mid_q_entry *
  97cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
  98{
  99        struct smb_hdr *buf = (struct smb_hdr *)buffer;
 100        struct mid_q_entry *mid;
 101
 102        spin_lock(&GlobalMid_Lock);
 103        list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 104                if (compare_mid(mid->mid, buf) &&
 105                    mid->mid_state == MID_REQUEST_SUBMITTED &&
 106                    le16_to_cpu(mid->command) == buf->Command) {
 107                        spin_unlock(&GlobalMid_Lock);
 108                        return mid;
 109                }
 110        }
 111        spin_unlock(&GlobalMid_Lock);
 112        return NULL;
 113}
 114
 115static void
 116cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
 117                 const int optype)
 118{
 119        spin_lock(&server->req_lock);
 120        server->credits += add;
 121        server->in_flight--;
 122        spin_unlock(&server->req_lock);
 123        wake_up(&server->request_q);
 124}
 125
 126static void
 127cifs_set_credits(struct TCP_Server_Info *server, const int val)
 128{
 129        spin_lock(&server->req_lock);
 130        server->credits = val;
 131        server->oplocks = val > 1 ? enable_oplocks : false;
 132        spin_unlock(&server->req_lock);
 133}
 134
 135static int *
 136cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)
 137{
 138        return &server->credits;
 139}
 140
 141static unsigned int
 142cifs_get_credits(struct mid_q_entry *mid)
 143{
 144        return 1;
 145}
 146
 147/*
 148 * Find a free multiplex id (SMB mid). Otherwise there could be
 149 * mid collisions which might cause problems, demultiplexing the
 150 * wrong response to this request. Multiplex ids could collide if
 151 * one of a series requests takes much longer than the others, or
 152 * if a very large number of long lived requests (byte range
 153 * locks or FindNotify requests) are pending. No more than
 154 * 64K-1 requests can be outstanding at one time. If no
 155 * mids are available, return zero. A future optimization
 156 * could make the combination of mids and uid the key we use
 157 * to demultiplex on (rather than mid alone).
 158 * In addition to the above check, the cifs demultiplex
 159 * code already used the command code as a secondary
 160 * check of the frame and if signing is negotiated the
 161 * response would be discarded if the mid were the same
 162 * but the signature was wrong. Since the mid is not put in the
 163 * pending queue until later (when it is about to be dispatched)
 164 * we do have to limit the number of outstanding requests
 165 * to somewhat less than 64K-1 although it is hard to imagine
 166 * so many threads being in the vfs at one time.
 167 */
 168static __u64
 169cifs_get_next_mid(struct TCP_Server_Info *server)
 170{
 171        __u64 mid = 0;
 172        __u16 last_mid, cur_mid;
 173        bool collision;
 174
 175        spin_lock(&GlobalMid_Lock);
 176
 177        /* mid is 16 bit only for CIFS/SMB */
 178        cur_mid = (__u16)((server->CurrentMid) & 0xffff);
 179        /* we do not want to loop forever */
 180        last_mid = cur_mid;
 181        cur_mid++;
 182
 183        /*
 184         * This nested loop looks more expensive than it is.
 185         * In practice the list of pending requests is short,
 186         * fewer than 50, and the mids are likely to be unique
 187         * on the first pass through the loop unless some request
 188         * takes longer than the 64 thousand requests before it
 189         * (and it would also have to have been a request that
 190         * did not time out).
 191         */
 192        while (cur_mid != last_mid) {
 193                struct mid_q_entry *mid_entry;
 194                unsigned int num_mids;
 195
 196                collision = false;
 197                if (cur_mid == 0)
 198                        cur_mid++;
 199
 200                num_mids = 0;
 201                list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
 202                        ++num_mids;
 203                        if (mid_entry->mid == cur_mid &&
 204                            mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
 205                                /* This mid is in use, try a different one */
 206                                collision = true;
 207                                break;
 208                        }
 209                }
 210
 211                /*
 212                 * if we have more than 32k mids in the list, then something
 213                 * is very wrong. Possibly a local user is trying to DoS the
 214                 * box by issuing long-running calls and SIGKILL'ing them. If
 215                 * we get to 2^16 mids then we're in big trouble as this
 216                 * function could loop forever.
 217                 *
 218                 * Go ahead and assign out the mid in this situation, but force
 219                 * an eventual reconnect to clean out the pending_mid_q.
 220                 */
 221                if (num_mids > 32768)
 222                        server->tcpStatus = CifsNeedReconnect;
 223
 224                if (!collision) {
 225                        mid = (__u64)cur_mid;
 226                        server->CurrentMid = mid;
 227                        break;
 228                }
 229                cur_mid++;
 230        }
 231        spin_unlock(&GlobalMid_Lock);
 232        return mid;
 233}
 234
 235/*
 236        return codes:
 237                0       not a transact2, or all data present
 238                >0      transact2 with that much data missing
 239                -EINVAL invalid transact2
 240 */
 241static int
 242check2ndT2(char *buf)
 243{
 244        struct smb_hdr *pSMB = (struct smb_hdr *)buf;
 245        struct smb_t2_rsp *pSMBt;
 246        int remaining;
 247        __u16 total_data_size, data_in_this_rsp;
 248
 249        if (pSMB->Command != SMB_COM_TRANSACTION2)
 250                return 0;
 251
 252        /* check for plausible wct, bcc and t2 data and parm sizes */
 253        /* check for parm and data offset going beyond end of smb */
 254        if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 255                cifs_dbg(FYI, "invalid transact2 word count\n");
 256                return -EINVAL;
 257        }
 258
 259        pSMBt = (struct smb_t2_rsp *)pSMB;
 260
 261        total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 262        data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
 263
 264        if (total_data_size == data_in_this_rsp)
 265                return 0;
 266        else if (total_data_size < data_in_this_rsp) {
 267                cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
 268                         total_data_size, data_in_this_rsp);
 269                return -EINVAL;
 270        }
 271
 272        remaining = total_data_size - data_in_this_rsp;
 273
 274        cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
 275                 remaining);
 276        if (total_data_size > CIFSMaxBufSize) {
 277                cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
 278                         total_data_size, CIFSMaxBufSize);
 279                return -EINVAL;
 280        }
 281        return remaining;
 282}
 283
 284static int
 285coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
 286{
 287        struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
 288        struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)target_hdr;
 289        char *data_area_of_tgt;
 290        char *data_area_of_src;
 291        int remaining;
 292        unsigned int byte_count, total_in_tgt;
 293        __u16 tgt_total_cnt, src_total_cnt, total_in_src;
 294
 295        src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
 296        tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
 297
 298        if (tgt_total_cnt != src_total_cnt)
 299                cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
 300                         src_total_cnt, tgt_total_cnt);
 301
 302        total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
 303
 304        remaining = tgt_total_cnt - total_in_tgt;
 305
 306        if (remaining < 0) {
 307                cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n",
 308                         tgt_total_cnt, total_in_tgt);
 309                return -EPROTO;
 310        }
 311
 312        if (remaining == 0) {
 313                /* nothing to do, ignore */
 314                cifs_dbg(FYI, "no more data remains\n");
 315                return 0;
 316        }
 317
 318        total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
 319        if (remaining < total_in_src)
 320                cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
 321
 322        /* find end of first SMB data area */
 323        data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
 324                                get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
 325
 326        /* validate target area */
 327        data_area_of_src = (char *)&pSMBs->hdr.Protocol +
 328                                get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
 329
 330        data_area_of_tgt += total_in_tgt;
 331
 332        total_in_tgt += total_in_src;
 333        /* is the result too big for the field? */
 334        if (total_in_tgt > USHRT_MAX) {
 335                cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
 336                         total_in_tgt);
 337                return -EPROTO;
 338        }
 339        put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
 340
 341        /* fix up the BCC */
 342        byte_count = get_bcc(target_hdr);
 343        byte_count += total_in_src;
 344        /* is the result too big for the field? */
 345        if (byte_count > USHRT_MAX) {
 346                cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
 347                return -EPROTO;
 348        }
 349        put_bcc(byte_count, target_hdr);
 350
 351        byte_count = be32_to_cpu(target_hdr->smb_buf_length);
 352        byte_count += total_in_src;
 353        /* don't allow buffer to overflow */
 354        if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
 355                cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
 356                         byte_count);
 357                return -ENOBUFS;
 358        }
 359        target_hdr->smb_buf_length = cpu_to_be32(byte_count);
 360
 361        /* copy second buffer into end of first buffer */
 362        memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
 363
 364        if (remaining != total_in_src) {
 365                /* more responses to go */
 366                cifs_dbg(FYI, "waiting for more secondary responses\n");
 367                return 1;
 368        }
 369
 370        /* we are done */
 371        cifs_dbg(FYI, "found the last secondary response\n");
 372        return 0;
 373}
 374
 375static bool
 376cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
 377                  char *buf, int malformed)
 378{
 379        if (malformed)
 380                return false;
 381        if (check2ndT2(buf) <= 0)
 382                return false;
 383        mid->multiRsp = true;
 384        if (mid->resp_buf) {
 385                /* merge response - fix up 1st*/
 386                malformed = coalesce_t2(buf, mid->resp_buf);
 387                if (malformed > 0)
 388                        return true;
 389                /* All parts received or packet is malformed. */
 390                mid->multiEnd = true;
 391                dequeue_mid(mid, malformed);
 392                return true;
 393        }
 394        if (!server->large_buf) {
 395                /*FIXME: switch to already allocated largebuf?*/
 396                cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
 397        } else {
 398                /* Have first buffer */
 399                mid->resp_buf = buf;
 400                mid->large_buf = true;
 401                server->bigbuf = NULL;
 402        }
 403        return true;
 404}
 405
 406static bool
 407cifs_need_neg(struct TCP_Server_Info *server)
 408{
 409        return server->maxBuf == 0;
 410}
 411
 412static int
 413cifs_negotiate(const unsigned int xid, struct cifs_ses *ses)
 414{
 415        int rc;
 416        rc = CIFSSMBNegotiate(xid, ses);
 417        if (rc == -EAGAIN) {
 418                /* retry only once on 1st time connection */
 419                set_credits(ses->server, 1);
 420                rc = CIFSSMBNegotiate(xid, ses);
 421                if (rc == -EAGAIN)
 422                        rc = -EHOSTDOWN;
 423        }
 424        return rc;
 425}
 426
 427static unsigned int
 428cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 429{
 430        __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
 431        struct TCP_Server_Info *server = tcon->ses->server;
 432        unsigned int wsize;
 433
 434        /* start with specified wsize, or default */
 435        if (volume_info->wsize)
 436                wsize = volume_info->wsize;
 437        else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
 438                wsize = CIFS_DEFAULT_IOSIZE;
 439        else
 440                wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
 441
 442        /* can server support 24-bit write sizes? (via UNIX extensions) */
 443        if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
 444                wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
 445
 446        /*
 447         * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
 448         * Limit it to max buffer offered by the server, minus the size of the
 449         * WRITEX header, not including the 4 byte RFC1001 length.
 450         */
 451        if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
 452            (!(server->capabilities & CAP_UNIX) && server->sign))
 453                wsize = min_t(unsigned int, wsize,
 454                                server->maxBuf - sizeof(WRITE_REQ) + 4);
 455
 456        /* hard limit of CIFS_MAX_WSIZE */
 457        wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
 458
 459        return wsize;
 460}
 461
 462static unsigned int
 463cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 464{
 465        __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
 466        struct TCP_Server_Info *server = tcon->ses->server;
 467        unsigned int rsize, defsize;
 468
 469        /*
 470         * Set default value...
 471         *
 472         * HACK alert! Ancient servers have very small buffers. Even though
 473         * MS-CIFS indicates that servers are only limited by the client's
 474         * bufsize for reads, testing against win98se shows that it throws
 475         * INVALID_PARAMETER errors if you try to request too large a read.
 476         * OS/2 just sends back short reads.
 477         *
 478         * If the server doesn't advertise CAP_LARGE_READ_X, then assume that
 479         * it can't handle a read request larger than its MaxBufferSize either.
 480         */
 481        if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
 482                defsize = CIFS_DEFAULT_IOSIZE;
 483        else if (server->capabilities & CAP_LARGE_READ_X)
 484                defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
 485        else
 486                defsize = server->maxBuf - sizeof(READ_RSP);
 487
 488        rsize = volume_info->rsize ? volume_info->rsize : defsize;
 489
 490        /*
 491         * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
 492         * the client's MaxBufferSize.
 493         */
 494        if (!(server->capabilities & CAP_LARGE_READ_X))
 495                rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
 496
 497        /* hard limit of CIFS_MAX_RSIZE */
 498        rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
 499
 500        return rsize;
 501}
 502
 503static void
 504cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 505{
 506        CIFSSMBQFSDeviceInfo(xid, tcon);
 507        CIFSSMBQFSAttributeInfo(xid, tcon);
 508}
 509
 510static int
 511cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 512                        struct cifs_sb_info *cifs_sb, const char *full_path)
 513{
 514        int rc;
 515        FILE_ALL_INFO *file_info;
 516
 517        file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
 518        if (file_info == NULL)
 519                return -ENOMEM;
 520
 521        rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,
 522                              0 /* not legacy */, cifs_sb->local_nls,
 523                              cifs_sb->mnt_cifs_flags &
 524                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 525
 526        if (rc == -EOPNOTSUPP || rc == -EINVAL)
 527                rc = SMBQueryInformation(xid, tcon, full_path, file_info,
 528                                cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 529                                  CIFS_MOUNT_MAP_SPECIAL_CHR);
 530        kfree(file_info);
 531        return rc;
 532}
 533
 534static int
 535cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
 536                     struct cifs_sb_info *cifs_sb, const char *full_path,
 537                     FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink)
 538{
 539        int rc;
 540
 541        *symlink = false;
 542
 543        /* could do find first instead but this returns more info */
 544        rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */,
 545                              cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 546                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 547        /*
 548         * BB optimize code so we do not make the above call when server claims
 549         * no NT SMB support and the above call failed at least once - set flag
 550         * in tcon or mount.
 551         */
 552        if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
 553                rc = SMBQueryInformation(xid, tcon, full_path, data,
 554                                         cifs_sb->local_nls,
 555                                         cifs_sb->mnt_cifs_flags &
 556                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 557                *adjustTZ = true;
 558        }
 559
 560        if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) {
 561                int tmprc;
 562                int oplock = 0;
 563                __u16 netfid;
 564
 565                /* Need to check if this is a symbolic link or not */
 566                tmprc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 567                                    FILE_READ_ATTRIBUTES, 0, &netfid, &oplock,
 568                                    NULL, cifs_sb->local_nls,
 569                        cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 570                if (tmprc == -EOPNOTSUPP)
 571                        *symlink = true;
 572                else
 573                        CIFSSMBClose(xid, tcon, netfid);
 574        }
 575
 576        return rc;
 577}
 578
 579static int
 580cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 581                  struct cifs_sb_info *cifs_sb, const char *full_path,
 582                  u64 *uniqueid, FILE_ALL_INFO *data)
 583{
 584        /*
 585         * We can not use the IndexNumber field by default from Windows or
 586         * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
 587         * CIFS spec claims that this value is unique within the scope of a
 588         * share, and the windows docs hint that it's actually unique
 589         * per-machine.
 590         *
 591         * There may be higher info levels that work but are there Windows
 592         * server or network appliances for which IndexNumber field is not
 593         * guaranteed unique?
 594         */
 595        return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,
 596                                     cifs_sb->local_nls,
 597                                     cifs_sb->mnt_cifs_flags &
 598                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 599}
 600
 601static int
 602cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 603                     struct cifs_fid *fid, FILE_ALL_INFO *data)
 604{
 605        return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data);
 606}
 607
 608static void
 609cifs_clear_stats(struct cifs_tcon *tcon)
 610{
 611#ifdef CONFIG_CIFS_STATS
 612        atomic_set(&tcon->stats.cifs_stats.num_writes, 0);
 613        atomic_set(&tcon->stats.cifs_stats.num_reads, 0);
 614        atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);
 615        atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);
 616        atomic_set(&tcon->stats.cifs_stats.num_opens, 0);
 617        atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);
 618        atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);
 619        atomic_set(&tcon->stats.cifs_stats.num_closes, 0);
 620        atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);
 621        atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);
 622        atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);
 623        atomic_set(&tcon->stats.cifs_stats.num_renames, 0);
 624        atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);
 625        atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);
 626        atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);
 627        atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);
 628        atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);
 629        atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);
 630        atomic_set(&tcon->stats.cifs_stats.num_locks, 0);
 631        atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);
 632        atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);
 633#endif
 634}
 635
 636static void
 637cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 638{
 639#ifdef CONFIG_CIFS_STATS
 640        seq_printf(m, " Oplocks breaks: %d",
 641                   atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));
 642        seq_printf(m, "\nReads:  %d Bytes: %llu",
 643                   atomic_read(&tcon->stats.cifs_stats.num_reads),
 644                   (long long)(tcon->bytes_read));
 645        seq_printf(m, "\nWrites: %d Bytes: %llu",
 646                   atomic_read(&tcon->stats.cifs_stats.num_writes),
 647                   (long long)(tcon->bytes_written));
 648        seq_printf(m, "\nFlushes: %d",
 649                   atomic_read(&tcon->stats.cifs_stats.num_flushes));
 650        seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",
 651                   atomic_read(&tcon->stats.cifs_stats.num_locks),
 652                   atomic_read(&tcon->stats.cifs_stats.num_hardlinks),
 653                   atomic_read(&tcon->stats.cifs_stats.num_symlinks));
 654        seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
 655                   atomic_read(&tcon->stats.cifs_stats.num_opens),
 656                   atomic_read(&tcon->stats.cifs_stats.num_closes),
 657                   atomic_read(&tcon->stats.cifs_stats.num_deletes));
 658        seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",
 659                   atomic_read(&tcon->stats.cifs_stats.num_posixopens),
 660                   atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));
 661        seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
 662                   atomic_read(&tcon->stats.cifs_stats.num_mkdirs),
 663                   atomic_read(&tcon->stats.cifs_stats.num_rmdirs));
 664        seq_printf(m, "\nRenames: %d T2 Renames %d",
 665                   atomic_read(&tcon->stats.cifs_stats.num_renames),
 666                   atomic_read(&tcon->stats.cifs_stats.num_t2renames));
 667        seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
 668                   atomic_read(&tcon->stats.cifs_stats.num_ffirst),
 669                   atomic_read(&tcon->stats.cifs_stats.num_fnext),
 670                   atomic_read(&tcon->stats.cifs_stats.num_fclose));
 671#endif
 672}
 673
 674static void
 675cifs_mkdir_setinfo(struct inode *inode, const char *full_path,
 676                   struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
 677                   const unsigned int xid)
 678{
 679        FILE_BASIC_INFO info;
 680        struct cifsInodeInfo *cifsInode;
 681        u32 dosattrs;
 682        int rc;
 683
 684        memset(&info, 0, sizeof(info));
 685        cifsInode = CIFS_I(inode);
 686        dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
 687        info.Attributes = cpu_to_le32(dosattrs);
 688        rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
 689                                cifs_sb->mnt_cifs_flags &
 690                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 691        if (rc == 0)
 692                cifsInode->cifsAttrs = dosattrs;
 693}
 694
 695static int
 696cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
 697               __u32 *oplock, FILE_ALL_INFO *buf)
 698{
 699        if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))
 700                return SMBLegacyOpen(xid, oparms->tcon, oparms->path,
 701                                     oparms->disposition,
 702                                     oparms->desired_access,
 703                                     oparms->create_options,
 704                                     &oparms->fid->netfid, oplock, buf,
 705                                     oparms->cifs_sb->local_nls,
 706                                     oparms->cifs_sb->mnt_cifs_flags
 707                                                & CIFS_MOUNT_MAP_SPECIAL_CHR);
 708        return CIFSSMBOpen(xid, oparms->tcon, oparms->path,
 709                           oparms->disposition, oparms->desired_access,
 710                           oparms->create_options, &oparms->fid->netfid, oplock,
 711                           buf, oparms->cifs_sb->local_nls,
 712                           oparms->cifs_sb->mnt_cifs_flags &
 713                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 714}
 715
 716static void
 717cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 718{
 719        struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
 720        cfile->fid.netfid = fid->netfid;
 721        cifs_set_oplock_level(cinode, oplock);
 722        cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
 723}
 724
 725static void
 726cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 727                struct cifs_fid *fid)
 728{
 729        CIFSSMBClose(xid, tcon, fid->netfid);
 730}
 731
 732static int
 733cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 734                struct cifs_fid *fid)
 735{
 736        return CIFSSMBFlush(xid, tcon, fid->netfid);
 737}
 738
 739static int
 740cifs_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
 741               struct cifs_io_parms *parms, unsigned int *bytes_read,
 742               char **buf, int *buf_type)
 743{
 744        parms->netfid = cfile->fid.netfid;
 745        return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);
 746}
 747
 748static int
 749cifs_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
 750                struct cifs_io_parms *parms, unsigned int *written,
 751                struct kvec *iov, unsigned long nr_segs)
 752{
 753
 754        parms->netfid = cfile->fid.netfid;
 755        return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);
 756}
 757
 758static int
 759smb_set_file_info(struct inode *inode, const char *full_path,
 760                  FILE_BASIC_INFO *buf, const unsigned int xid)
 761{
 762        int oplock = 0;
 763        int rc;
 764        __u16 netfid;
 765        __u32 netpid;
 766        struct cifsFileInfo *open_file;
 767        struct cifsInodeInfo *cinode = CIFS_I(inode);
 768        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 769        struct tcon_link *tlink = NULL;
 770        struct cifs_tcon *tcon;
 771
 772        /* if the file is already open for write, just use that fileid */
 773        open_file = find_writable_file(cinode, true);
 774        if (open_file) {
 775                netfid = open_file->fid.netfid;
 776                netpid = open_file->pid;
 777                tcon = tlink_tcon(open_file->tlink);
 778                goto set_via_filehandle;
 779        }
 780
 781        tlink = cifs_sb_tlink(cifs_sb);
 782        if (IS_ERR(tlink)) {
 783                rc = PTR_ERR(tlink);
 784                tlink = NULL;
 785                goto out;
 786        }
 787        tcon = tlink_tcon(tlink);
 788
 789        rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
 790                                        cifs_sb->mnt_cifs_flags &
 791                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 792        if (rc == 0) {
 793                cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
 794                goto out;
 795        } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {
 796                goto out;
 797        }
 798
 799        cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");
 800        rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 801                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
 802                         &netfid, &oplock, NULL, cifs_sb->local_nls,
 803                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 804
 805        if (rc != 0) {
 806                if (rc == -EIO)
 807                        rc = -EINVAL;
 808                goto out;
 809        }
 810
 811        netpid = current->tgid;
 812
 813set_via_filehandle:
 814        rc = CIFSSMBSetFileInfo(xid, tcon, buf, netfid, netpid);
 815        if (!rc)
 816                cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
 817
 818        if (open_file == NULL)
 819                CIFSSMBClose(xid, tcon, netfid);
 820        else
 821                cifsFileInfo_put(open_file);
 822out:
 823        if (tlink != NULL)
 824                cifs_put_tlink(tlink);
 825        return rc;
 826}
 827
 828static int
 829cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
 830                   struct cifsFileInfo *cfile)
 831{
 832        return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);
 833}
 834
 835static int
 836cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 837                     const char *path, struct cifs_sb_info *cifs_sb,
 838                     struct cifs_fid *fid, __u16 search_flags,
 839                     struct cifs_search_info *srch_inf)
 840{
 841        return CIFSFindFirst(xid, tcon, path, cifs_sb,
 842                             &fid->netfid, search_flags, srch_inf, true);
 843}
 844
 845static int
 846cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
 847                    struct cifs_fid *fid, __u16 search_flags,
 848                    struct cifs_search_info *srch_inf)
 849{
 850        return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);
 851}
 852
 853static int
 854cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
 855               struct cifs_fid *fid)
 856{
 857        return CIFSFindClose(xid, tcon, fid->netfid);
 858}
 859
 860static int
 861cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
 862                     struct cifsInodeInfo *cinode)
 863{
 864        return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0,
 865                           LOCKING_ANDX_OPLOCK_RELEASE, false,
 866                           CIFS_CACHE_READ(cinode) ? 1 : 0);
 867}
 868
 869static int
 870cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
 871             struct kstatfs *buf)
 872{
 873        int rc = -EOPNOTSUPP;
 874
 875        buf->f_type = CIFS_MAGIC_NUMBER;
 876
 877        /*
 878         * We could add a second check for a QFS Unix capability bit
 879         */
 880        if ((tcon->ses->capabilities & CAP_UNIX) &&
 881            (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 882                rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 883
 884        /*
 885         * Only need to call the old QFSInfo if failed on newer one,
 886         * e.g. by OS/2.
 887         **/
 888        if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 889                rc = CIFSSMBQFSInfo(xid, tcon, buf);
 890
 891        /*
 892         * Some old Windows servers also do not support level 103, retry with
 893         * older level one if old server failed the previous call or we
 894         * bypassed it because we detected that this was an older LANMAN sess
 895         */
 896        if (rc)
 897                rc = SMBOldQFSInfo(xid, tcon, buf);
 898        return rc;
 899}
 900
 901static int
 902cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
 903               __u64 length, __u32 type, int lock, int unlock, bool wait)
 904{
 905        return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,
 906                           current->tgid, length, offset, unlock, lock,
 907                           (__u8)type, wait, 0);
 908}
 909
 910static int
 911cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 912                   const char *full_path, char **target_path,
 913                   struct cifs_sb_info *cifs_sb)
 914{
 915        int rc;
 916        int oplock = 0;
 917        __u16 netfid;
 918
 919        cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
 920
 921        rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
 922                         FILE_READ_ATTRIBUTES, OPEN_REPARSE_POINT, &netfid,
 923                         &oplock, NULL, cifs_sb->local_nls,
 924                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
 925        if (rc)
 926                return rc;
 927
 928        rc = CIFSSMBQuerySymLink(xid, tcon, netfid, target_path,
 929                                 cifs_sb->local_nls);
 930        if (rc) {
 931                CIFSSMBClose(xid, tcon, netfid);
 932                return rc;
 933        }
 934
 935        convert_delimiter(*target_path, '/');
 936        CIFSSMBClose(xid, tcon, netfid);
 937        cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
 938        return rc;
 939}
 940
 941static bool
 942cifs_is_read_op(__u32 oplock)
 943{
 944        return oplock == OPLOCK_READ;
 945}
 946
 947struct smb_version_operations smb1_operations = {
 948        .send_cancel = send_nt_cancel,
 949        .compare_fids = cifs_compare_fids,
 950        .setup_request = cifs_setup_request,
 951        .setup_async_request = cifs_setup_async_request,
 952        .check_receive = cifs_check_receive,
 953        .add_credits = cifs_add_credits,
 954        .set_credits = cifs_set_credits,
 955        .get_credits_field = cifs_get_credits_field,
 956        .get_credits = cifs_get_credits,
 957        .get_next_mid = cifs_get_next_mid,
 958        .read_data_offset = cifs_read_data_offset,
 959        .read_data_length = cifs_read_data_length,
 960        .map_error = map_smb_to_linux_error,
 961        .find_mid = cifs_find_mid,
 962        .check_message = checkSMB,
 963        .dump_detail = cifs_dump_detail,
 964        .clear_stats = cifs_clear_stats,
 965        .print_stats = cifs_print_stats,
 966        .is_oplock_break = is_valid_oplock_break,
 967        .check_trans2 = cifs_check_trans2,
 968        .need_neg = cifs_need_neg,
 969        .negotiate = cifs_negotiate,
 970        .negotiate_wsize = cifs_negotiate_wsize,
 971        .negotiate_rsize = cifs_negotiate_rsize,
 972        .sess_setup = CIFS_SessSetup,
 973        .logoff = CIFSSMBLogoff,
 974        .tree_connect = CIFSTCon,
 975        .tree_disconnect = CIFSSMBTDis,
 976        .get_dfs_refer = CIFSGetDFSRefer,
 977        .qfs_tcon = cifs_qfs_tcon,
 978        .is_path_accessible = cifs_is_path_accessible,
 979        .query_path_info = cifs_query_path_info,
 980        .query_file_info = cifs_query_file_info,
 981        .get_srv_inum = cifs_get_srv_inum,
 982        .set_path_size = CIFSSMBSetEOF,
 983        .set_file_size = CIFSSMBSetFileSize,
 984        .set_file_info = smb_set_file_info,
 985        .set_compression = cifs_set_compression,
 986        .echo = CIFSSMBEcho,
 987        .mkdir = CIFSSMBMkDir,
 988        .mkdir_setinfo = cifs_mkdir_setinfo,
 989        .rmdir = CIFSSMBRmDir,
 990        .unlink = CIFSSMBDelFile,
 991        .rename_pending_delete = cifs_rename_pending_delete,
 992        .rename = CIFSSMBRename,
 993        .create_hardlink = CIFSCreateHardLink,
 994        .query_symlink = cifs_query_symlink,
 995        .open = cifs_open_file,
 996        .set_fid = cifs_set_fid,
 997        .close = cifs_close_file,
 998        .flush = cifs_flush_file,
 999        .async_readv = cifs_async_readv,
1000        .async_writev = cifs_async_writev,
1001        .sync_read = cifs_sync_read,
1002        .sync_write = cifs_sync_write,
1003        .query_dir_first = cifs_query_dir_first,
1004        .query_dir_next = cifs_query_dir_next,
1005        .close_dir = cifs_close_dir,
1006        .calc_smb_size = smbCalcSize,
1007        .oplock_response = cifs_oplock_response,
1008        .queryfs = cifs_queryfs,
1009        .mand_lock = cifs_mand_lock,
1010        .mand_unlock_range = cifs_unlock_range,
1011        .push_mand_locks = cifs_push_mandatory_locks,
1012        .query_mf_symlink = open_query_close_cifs_symlink,
1013        .is_read_op = cifs_is_read_op,
1014#ifdef CONFIG_CIFS_XATTR
1015        .query_all_EAs = CIFSSMBQAllEAs,
1016        .set_EA = CIFSSMBSetEA,
1017#endif /* CIFS_XATTR */
1018#ifdef CONFIG_CIFS_ACL
1019        .get_acl = get_cifs_acl,
1020        .set_acl = set_cifs_acl,
1021#endif /* CIFS_ACL */
1022};
1023
1024struct smb_version_values smb1_values = {
1025        .version_string = SMB1_VERSION_STRING,
1026        .large_lock_type = LOCKING_ANDX_LARGE_FILES,
1027        .exclusive_lock_type = 0,
1028        .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,
1029        .unlock_lock_type = 0,
1030        .header_size = sizeof(struct smb_hdr),
1031        .max_header_size = MAX_CIFS_HDR_SIZE,
1032        .read_rsp_size = sizeof(READ_RSP),
1033        .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),
1034        .cap_unix = CAP_UNIX,
1035        .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
1036        .cap_large_files = CAP_LARGE_FILES,
1037        .signing_enabled = SECMODE_SIGN_ENABLED,
1038        .signing_required = SECMODE_SIGN_REQUIRED,
1039};
1040