source: src/linux/universal/linux-4.4/fs/cifs/smb2pdu.c @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 3 months ago

kernel update

File size: 82.6 KB
Line 
1/*
2 *   fs/cifs/smb2pdu.c
3 *
4 *   Copyright (C) International Business Machines  Corp., 2009, 2013
5 *                 Etersoft, 2012
6 *   Author(s): Steve French (sfrench@us.ibm.com)
7 *              Pavel Shilovsky (pshilovsky@samba.org) 2012
8 *
9 *   Contains the routines for constructing the SMB2 PDUs themselves
10 *
11 *   This library is free software; you can redistribute it and/or modify
12 *   it under the terms of the GNU Lesser General Public License as published
13 *   by the Free Software Foundation; either version 2.1 of the License, or
14 *   (at your option) any later version.
15 *
16 *   This library is distributed in the hope that it will be useful,
17 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
18 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
19 *   the GNU Lesser General Public License for more details.
20 *
21 *   You should have received a copy of the GNU Lesser General Public License
22 *   along with this library; if not, write to the Free Software
23 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
27 /* Note that there are handle based routines which must be                   */
28 /* treated slightly differently for reconnection purposes since we never     */
29 /* want to reuse a stale file handle and only the caller knows the file info */
30
31#include <linux/fs.h>
32#include <linux/kernel.h>
33#include <linux/vfs.h>
34#include <linux/task_io_accounting_ops.h>
35#include <linux/uaccess.h>
36#include <linux/pagemap.h>
37#include <linux/xattr.h>
38#include "smb2pdu.h"
39#include "cifsglob.h"
40#include "cifsacl.h"
41#include "cifsproto.h"
42#include "smb2proto.h"
43#include "cifs_unicode.h"
44#include "cifs_debug.h"
45#include "ntlmssp.h"
46#include "smb2status.h"
47#include "smb2glob.h"
48#include "cifspdu.h"
49#include "cifs_spnego.h"
50
51/*
52 *  The following table defines the expected "StructureSize" of SMB2 requests
53 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
54 *
55 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
56 *  indexed by command in host byte order.
57 */
58static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
59        /* SMB2_NEGOTIATE */ 36,
60        /* SMB2_SESSION_SETUP */ 25,
61        /* SMB2_LOGOFF */ 4,
62        /* SMB2_TREE_CONNECT */ 9,
63        /* SMB2_TREE_DISCONNECT */ 4,
64        /* SMB2_CREATE */ 57,
65        /* SMB2_CLOSE */ 24,
66        /* SMB2_FLUSH */ 24,
67        /* SMB2_READ */ 49,
68        /* SMB2_WRITE */ 49,
69        /* SMB2_LOCK */ 48,
70        /* SMB2_IOCTL */ 57,
71        /* SMB2_CANCEL */ 4,
72        /* SMB2_ECHO */ 4,
73        /* SMB2_QUERY_DIRECTORY */ 33,
74        /* SMB2_CHANGE_NOTIFY */ 32,
75        /* SMB2_QUERY_INFO */ 41,
76        /* SMB2_SET_INFO */ 33,
77        /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
78};
79
80
81static void
82smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
83                  const struct cifs_tcon *tcon)
84{
85        struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
86        char *temp = (char *)hdr;
87        /* lookup word count ie StructureSize from table */
88        __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
89
90        /*
91         * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
92         * largest operations (Create)
93         */
94        memset(temp, 0, 256);
95
96        /* Note this is only network field converted to big endian */
97        hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
98                        - 4 /*  RFC 1001 length field itself not counted */);
99
100        hdr->ProtocolId[0] = 0xFE;
101        hdr->ProtocolId[1] = 'S';
102        hdr->ProtocolId[2] = 'M';
103        hdr->ProtocolId[3] = 'B';
104        hdr->StructureSize = cpu_to_le16(64);
105        hdr->Command = smb2_cmd;
106        if (tcon && tcon->ses && tcon->ses->server) {
107                struct TCP_Server_Info *server = tcon->ses->server;
108
109                spin_lock(&server->req_lock);
110                /* Request up to 2 credits but don't go over the limit. */
111                if (server->credits >= SMB2_MAX_CREDITS_AVAILABLE)
112                        hdr->CreditRequest = cpu_to_le16(0);
113                else
114                        hdr->CreditRequest = cpu_to_le16(
115                                min_t(int, SMB2_MAX_CREDITS_AVAILABLE -
116                                                server->credits, 2));
117                spin_unlock(&server->req_lock);
118        } else {
119                hdr->CreditRequest = cpu_to_le16(2);
120        }
121        hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
122
123        if (!tcon)
124                goto out;
125
126        /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
127        /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
128        if ((tcon->ses) && (tcon->ses->server) &&
129            (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
130                hdr->CreditCharge = cpu_to_le16(1);
131        /* else CreditCharge MBZ */
132
133        hdr->TreeId = tcon->tid;
134        /* Uid is not converted */
135        if (tcon->ses)
136                hdr->SessionId = tcon->ses->Suid;
137
138        /*
139         * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
140         * to pass the path on the Open SMB prefixed by \\server\share.
141         * Not sure when we would need to do the augmented path (if ever) and
142         * setting this flag breaks the SMB2 open operation since it is
143         * illegal to send an empty path name (without \\server\share prefix)
144         * when the DFS flag is set in the SMB open header. We could
145         * consider setting the flag on all operations other than open
146         * but it is safer to net set it for now.
147         */
148/*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
149                hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
150
151        if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
152                hdr->Flags |= SMB2_FLAGS_SIGNED;
153out:
154        pdu->StructureSize2 = cpu_to_le16(parmsize);
155        return;
156}
157
158static int
159smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
160{
161        int rc = 0;
162        struct nls_table *nls_codepage;
163        struct cifs_ses *ses;
164        struct TCP_Server_Info *server;
165
166        /*
167         * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
168         * check for tcp and smb session status done differently
169         * for those three - in the calling routine.
170         */
171        if (tcon == NULL)
172                return rc;
173
174        if (smb2_command == SMB2_TREE_CONNECT)
175                return rc;
176
177        if (tcon->tidStatus == CifsExiting) {
178                /*
179                 * only tree disconnect, open, and write,
180                 * (and ulogoff which does not have tcon)
181                 * are allowed as we start force umount.
182                 */
183                if ((smb2_command != SMB2_WRITE) &&
184                   (smb2_command != SMB2_CREATE) &&
185                   (smb2_command != SMB2_TREE_DISCONNECT)) {
186                        cifs_dbg(FYI, "can not send cmd %d while umounting\n",
187                                 smb2_command);
188                        return -ENODEV;
189                }
190        }
191        if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
192            (!tcon->ses->server))
193                return -EIO;
194
195        ses = tcon->ses;
196        server = ses->server;
197
198        /*
199         * Give demultiplex thread up to 10 seconds to reconnect, should be
200         * greater than cifs socket timeout which is 7 seconds
201         */
202        while (server->tcpStatus == CifsNeedReconnect) {
203                /*
204                 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
205                 * here since they are implicitly done when session drops.
206                 */
207                switch (smb2_command) {
208                /*
209                 * BB Should we keep oplock break and add flush to exceptions?
210                 */
211                case SMB2_TREE_DISCONNECT:
212                case SMB2_CANCEL:
213                case SMB2_CLOSE:
214                case SMB2_OPLOCK_BREAK:
215                        return -EAGAIN;
216                }
217
218                wait_event_interruptible_timeout(server->response_q,
219                        (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
220
221                /* are we still trying to reconnect? */
222                if (server->tcpStatus != CifsNeedReconnect)
223                        break;
224
225                /*
226                 * on "soft" mounts we wait once. Hard mounts keep
227                 * retrying until process is killed or server comes
228                 * back on-line
229                 */
230                if (!tcon->retry) {
231                        cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
232                        return -EHOSTDOWN;
233                }
234        }
235
236        if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
237                return rc;
238
239        nls_codepage = load_nls_default();
240
241        /*
242         * need to prevent multiple threads trying to simultaneously reconnect
243         * the same SMB session
244         */
245        mutex_lock(&tcon->ses->session_mutex);
246        rc = cifs_negotiate_protocol(0, tcon->ses);
247        if (!rc && tcon->ses->need_reconnect)
248                rc = cifs_setup_session(0, tcon->ses, nls_codepage);
249
250        if (rc || !tcon->need_reconnect) {
251                mutex_unlock(&tcon->ses->session_mutex);
252                goto out;
253        }
254
255        cifs_mark_open_files_invalid(tcon);
256        rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
257        mutex_unlock(&tcon->ses->session_mutex);
258        cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
259        if (rc)
260                goto out;
261        atomic_inc(&tconInfoReconnectCount);
262out:
263        /*
264         * Check if handle based operation so we know whether we can continue
265         * or not without returning to caller to reset file handle.
266         */
267        /*
268         * BB Is flush done by server on drop of tcp session? Should we special
269         * case it and skip above?
270         */
271        switch (smb2_command) {
272        case SMB2_FLUSH:
273        case SMB2_READ:
274        case SMB2_WRITE:
275        case SMB2_LOCK:
276        case SMB2_IOCTL:
277        case SMB2_QUERY_DIRECTORY:
278        case SMB2_CHANGE_NOTIFY:
279        case SMB2_QUERY_INFO:
280        case SMB2_SET_INFO:
281                rc = -EAGAIN;
282        }
283        unload_nls(nls_codepage);
284        return rc;
285}
286
287/*
288 * Allocate and return pointer to an SMB request hdr, and set basic
289 * SMB information in the SMB header. If the return code is zero, this
290 * function must have filled in request_buf pointer.
291 */
292static int
293small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
294                void **request_buf)
295{
296        int rc = 0;
297
298        rc = smb2_reconnect(smb2_command, tcon);
299        if (rc)
300                return rc;
301
302        /* BB eventually switch this to SMB2 specific small buf size */
303        *request_buf = cifs_small_buf_get();
304        if (*request_buf == NULL) {
305                /* BB should we add a retry in here if not a writepage? */
306                return -ENOMEM;
307        }
308
309        smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
310
311        if (tcon != NULL) {
312#ifdef CONFIG_CIFS_STATS2
313                uint16_t com_code = le16_to_cpu(smb2_command);
314                cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
315#endif
316                cifs_stats_inc(&tcon->num_smbs_sent);
317        }
318
319        return rc;
320}
321
322#ifdef CONFIG_CIFS_SMB311
323/* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
324#define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
325
326
327#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
328#define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
329
330static void
331build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
332{
333        pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
334        pneg_ctxt->DataLength = cpu_to_le16(38);
335        pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
336        pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
337        get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
338        pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
339}
340
341static void
342build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
343{
344        pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
345        pneg_ctxt->DataLength = cpu_to_le16(6);
346        pneg_ctxt->CipherCount = cpu_to_le16(2);
347        pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
348        pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
349}
350
351static void
352assemble_neg_contexts(struct smb2_negotiate_req *req)
353{
354
355        /* +4 is to account for the RFC1001 len field */
356        char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
357
358        build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
359        /* Add 2 to size to round to 8 byte boundary */
360        pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
361        build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
362        req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
363        req->NegotiateContextCount = cpu_to_le16(2);
364        inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
365                        + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
366}
367#else
368static void assemble_neg_contexts(struct smb2_negotiate_req *req)
369{
370        return;
371}
372#endif /* SMB311 */
373
374
375/*
376 *
377 *      SMB2 Worker functions follow:
378 *
379 *      The general structure of the worker functions is:
380 *      1) Call smb2_init (assembles SMB2 header)
381 *      2) Initialize SMB2 command specific fields in fixed length area of SMB
382 *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
383 *      4) Decode SMB2 command specific fields in the fixed length area
384 *      5) Decode variable length data area (if any for this SMB2 command type)
385 *      6) Call free smb buffer
386 *      7) return
387 *
388 */
389
390int
391SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
392{
393        struct smb2_negotiate_req *req;
394        struct smb2_negotiate_rsp *rsp;
395        struct kvec iov[1];
396        int rc = 0;
397        int resp_buftype;
398        struct TCP_Server_Info *server = ses->server;
399        int blob_offset, blob_length;
400        char *security_blob;
401        int flags = CIFS_NEG_OP;
402
403        cifs_dbg(FYI, "Negotiate protocol\n");
404
405        if (!server) {
406                WARN(1, "%s: server is NULL!\n", __func__);
407                return -EIO;
408        }
409
410        rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
411        if (rc)
412                return rc;
413
414        req->hdr.SessionId = 0;
415
416        req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
417
418        req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
419        inc_rfc1001_len(req, 2);
420
421        /* only one of SMB2 signing flags may be set in SMB2 request */
422        if (ses->sign)
423                req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
424        else if (global_secflags & CIFSSEC_MAY_SIGN)
425                req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
426        else
427                req->SecurityMode = 0;
428
429        req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
430
431        /* ClientGUID must be zero for SMB2.02 dialect */
432        if (ses->server->vals->protocol_id == SMB20_PROT_ID)
433                memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
434        else {
435                memcpy(req->ClientGUID, server->client_guid,
436                        SMB2_CLIENT_GUID_SIZE);
437                if (ses->server->vals->protocol_id == SMB311_PROT_ID)
438                        assemble_neg_contexts(req);
439        }
440        iov[0].iov_base = (char *)req;
441        /* 4 for rfc1002 length field */
442        iov[0].iov_len = get_rfc1002_length(req) + 4;
443
444        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
445
446        rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
447        /*
448         * No tcon so can't do
449         * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
450         */
451        if (rc != 0)
452                goto neg_exit;
453
454        cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
455
456        /* BB we may eventually want to match the negotiated vs. requested
457           dialect, even though we are only requesting one at a time */
458        if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
459                cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
460        else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
461                cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
462        else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
463                cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
464        else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
465                cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
466#ifdef CONFIG_CIFS_SMB311
467        else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
468                cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
469#endif /* SMB311 */
470        else {
471                cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
472                         le16_to_cpu(rsp->DialectRevision));
473                rc = -EIO;
474                goto neg_exit;
475        }
476        server->dialect = le16_to_cpu(rsp->DialectRevision);
477
478        /* SMB2 only has an extended negflavor */
479        server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
480        /* set it to the maximum buffer size value we can send with 1 credit */
481        server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
482                               SMB2_MAX_BUFFER_SIZE);
483        server->max_read = le32_to_cpu(rsp->MaxReadSize);
484        server->max_write = le32_to_cpu(rsp->MaxWriteSize);
485        /* BB Do we need to validate the SecurityMode? */
486        server->sec_mode = le16_to_cpu(rsp->SecurityMode);
487        server->capabilities = le32_to_cpu(rsp->Capabilities);
488        /* Internal types */
489        server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
490
491        security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
492                                               &rsp->hdr);
493        /*
494         * See MS-SMB2 section 2.2.4: if no blob, client picks default which
495         * for us will be
496         *      ses->sectype = RawNTLMSSP;
497         * but for time being this is our only auth choice so doesn't matter.
498         * We just found a server which sets blob length to zero expecting raw.
499         */
500        if (blob_length == 0)
501                cifs_dbg(FYI, "missing security blob on negprot\n");
502
503        rc = cifs_enable_signing(server, ses->sign);
504        if (rc)
505                goto neg_exit;
506        if (blob_length) {
507                rc = decode_negTokenInit(security_blob, blob_length, server);
508                if (rc == 1)
509                        rc = 0;
510                else if (rc == 0)
511                        rc = -EIO;
512        }
513neg_exit:
514        free_rsp_buf(resp_buftype, rsp);
515        return rc;
516}
517
518int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
519{
520        int rc = 0;
521        struct validate_negotiate_info_req vneg_inbuf;
522        struct validate_negotiate_info_rsp *pneg_rsp;
523        u32 rsplen;
524
525        cifs_dbg(FYI, "validate negotiate\n");
526
527        /*
528         * validation ioctl must be signed, so no point sending this if we
529         * can not sign it.  We could eventually change this to selectively
530         * sign just this, the first and only signed request on a connection.
531         * This is good enough for now since a user who wants better security
532         * would also enable signing on the mount. Having validation of
533         * negotiate info for signed connections helps reduce attack vectors
534         */
535        if (tcon->ses->server->sign == false)
536                return 0; /* validation requires signing */
537
538        vneg_inbuf.Capabilities =
539                        cpu_to_le32(tcon->ses->server->vals->req_capabilities);
540        memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
541                                        SMB2_CLIENT_GUID_SIZE);
542
543        if (tcon->ses->sign)
544                vneg_inbuf.SecurityMode =
545                        cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
546        else if (global_secflags & CIFSSEC_MAY_SIGN)
547                vneg_inbuf.SecurityMode =
548                        cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
549        else
550                vneg_inbuf.SecurityMode = 0;
551
552        vneg_inbuf.DialectCount = cpu_to_le16(1);
553        vneg_inbuf.Dialects[0] =
554                cpu_to_le16(tcon->ses->server->vals->protocol_id);
555
556        rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
557                FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
558                (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
559                (char **)&pneg_rsp, &rsplen);
560
561        if (rc != 0) {
562                cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
563                return -EIO;
564        }
565
566        if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
567                cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
568                return -EIO;
569        }
570
571        /* check validate negotiate info response matches what we got earlier */
572        if (pneg_rsp->Dialect !=
573                        cpu_to_le16(tcon->ses->server->vals->protocol_id))
574                goto vneg_out;
575
576        if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
577                goto vneg_out;
578
579        /* do not validate server guid because not saved at negprot time yet */
580
581        if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
582              SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
583                goto vneg_out;
584
585        /* validate negotiate successful */
586        cifs_dbg(FYI, "validate negotiate info successful\n");
587        return 0;
588
589vneg_out:
590        cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
591        return -EIO;
592}
593
594int
595SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
596                const struct nls_table *nls_cp)
597{
598        struct smb2_sess_setup_req *req;
599        struct smb2_sess_setup_rsp *rsp = NULL;
600        struct kvec iov[2];
601        int rc = 0;
602        int resp_buftype = CIFS_NO_BUFFER;
603        __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
604        struct TCP_Server_Info *server = ses->server;
605        u16 blob_length = 0;
606        struct key *spnego_key = NULL;
607        char *security_blob = NULL;
608        unsigned char *ntlmssp_blob = NULL;
609        bool use_spnego = false; /* else use raw ntlmssp */
610        u64 previous_session = ses->Suid;
611
612        cifs_dbg(FYI, "Session Setup\n");
613
614        if (!server) {
615                WARN(1, "%s: server is NULL!\n", __func__);
616                return -EIO;
617        }
618
619        /*
620         * If we are here due to reconnect, free per-smb session key
621         * in case signing was required.
622         */
623        kfree(ses->auth_key.response);
624        ses->auth_key.response = NULL;
625
626        /*
627         * If memory allocation is successful, caller of this function
628         * frees it.
629         */
630        ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
631        if (!ses->ntlmssp)
632                return -ENOMEM;
633        ses->ntlmssp->sesskey_per_smbsess = true;
634
635        /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
636        if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
637                ses->sectype = RawNTLMSSP;
638
639ssetup_ntlmssp_authenticate:
640        if (phase == NtLmChallenge)
641                phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
642
643        rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
644        if (rc)
645                return rc;
646
647        req->hdr.SessionId = 0; /* First session, not a reauthenticate */
648
649        /* if reconnect, we need to send previous sess id, otherwise it is 0 */
650        req->PreviousSessionId = previous_session;
651
652        req->Flags = 0; /* MBZ */
653        /* to enable echos and oplocks */
654        req->hdr.CreditRequest = cpu_to_le16(3);
655
656        /* only one of SMB2 signing flags may be set in SMB2 request */
657        if (server->sign)
658                req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
659        else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
660                req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
661        else
662                req->SecurityMode = 0;
663
664        req->Capabilities = 0;
665        req->Channel = 0; /* MBZ */
666
667        iov[0].iov_base = (char *)req;
668        /* 4 for rfc1002 length field and 1 for pad */
669        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
670
671        if (ses->sectype == Kerberos) {
672#ifdef CONFIG_CIFS_UPCALL
673                struct cifs_spnego_msg *msg;
674
675                spnego_key = cifs_get_spnego_key(ses);
676                if (IS_ERR(spnego_key)) {
677                        rc = PTR_ERR(spnego_key);
678                        spnego_key = NULL;
679                        goto ssetup_exit;
680                }
681
682                msg = spnego_key->payload.data[0];
683                /*
684                 * check version field to make sure that cifs.upcall is
685                 * sending us a response in an expected form
686                 */
687                if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
688                        cifs_dbg(VFS,
689                                  "bad cifs.upcall version. Expected %d got %d",
690                                  CIFS_SPNEGO_UPCALL_VERSION, msg->version);
691                        rc = -EKEYREJECTED;
692                        goto ssetup_exit;
693                }
694                ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
695                                                 GFP_KERNEL);
696                if (!ses->auth_key.response) {
697                        cifs_dbg(VFS,
698                                "Kerberos can't allocate (%u bytes) memory",
699                                msg->sesskey_len);
700                        rc = -ENOMEM;
701                        goto ssetup_exit;
702                }
703                ses->auth_key.len = msg->sesskey_len;
704                blob_length = msg->secblob_len;
705                iov[1].iov_base = msg->data + msg->sesskey_len;
706                iov[1].iov_len = blob_length;
707#else
708                rc = -EOPNOTSUPP;
709                goto ssetup_exit;
710#endif /* CONFIG_CIFS_UPCALL */
711        } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
712                ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
713                                       GFP_KERNEL);
714                if (ntlmssp_blob == NULL) {
715                        rc = -ENOMEM;
716                        goto ssetup_exit;
717                }
718                build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
719                if (use_spnego) {
720                        /* blob_length = build_spnego_ntlmssp_blob(
721                                        &security_blob,
722                                        sizeof(struct _NEGOTIATE_MESSAGE),
723                                        ntlmssp_blob); */
724                        /* BB eventually need to add this */
725                        cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
726                        rc = -EOPNOTSUPP;
727                        kfree(ntlmssp_blob);
728                        goto ssetup_exit;
729                } else {
730                        blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
731                        /* with raw NTLMSSP we don't encapsulate in SPNEGO */
732                        security_blob = ntlmssp_blob;
733                }
734                iov[1].iov_base = security_blob;
735                iov[1].iov_len = blob_length;
736        } else if (phase == NtLmAuthenticate) {
737                req->hdr.SessionId = ses->Suid;
738                rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
739                                             nls_cp);
740                if (rc) {
741                        cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
742                                 rc);
743                        goto ssetup_exit; /* BB double check error handling */
744                }
745                if (use_spnego) {
746                        /* blob_length = build_spnego_ntlmssp_blob(
747                                                        &security_blob,
748                                                        blob_length,
749                                                        ntlmssp_blob); */
750                        cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
751                        rc = -EOPNOTSUPP;
752                        kfree(ntlmssp_blob);
753                        goto ssetup_exit;
754                } else {
755                        security_blob = ntlmssp_blob;
756                }
757                iov[1].iov_base = security_blob;
758                iov[1].iov_len = blob_length;
759        } else {
760                cifs_dbg(VFS, "illegal ntlmssp phase\n");
761                rc = -EIO;
762                goto ssetup_exit;
763        }
764
765        /* Testing shows that buffer offset must be at location of Buffer[0] */
766        req->SecurityBufferOffset =
767                                cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
768                                            1 /* pad */ - 4 /* rfc1001 len */);
769        req->SecurityBufferLength = cpu_to_le16(blob_length);
770
771        inc_rfc1001_len(req, blob_length - 1 /* pad */);
772
773        /* BB add code to build os and lm fields */
774
775        rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
776                          CIFS_LOG_ERROR | CIFS_NEG_OP);
777
778        kfree(security_blob);
779        rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
780        ses->Suid = rsp->hdr.SessionId;
781        if (resp_buftype != CIFS_NO_BUFFER &&
782            rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
783                if (phase != NtLmNegotiate) {
784                        cifs_dbg(VFS, "Unexpected more processing error\n");
785                        goto ssetup_exit;
786                }
787                if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
788                                le16_to_cpu(rsp->SecurityBufferOffset)) {
789                        cifs_dbg(VFS, "Invalid security buffer offset %d\n",
790                                 le16_to_cpu(rsp->SecurityBufferOffset));
791                        rc = -EIO;
792                        goto ssetup_exit;
793                }
794
795                /* NTLMSSP Negotiate sent now processing challenge (response) */
796                phase = NtLmChallenge; /* process ntlmssp challenge */
797                rc = 0; /* MORE_PROCESSING is not an error here but expected */
798                rc = decode_ntlmssp_challenge(rsp->Buffer,
799                                le16_to_cpu(rsp->SecurityBufferLength), ses);
800        }
801
802        /*
803         * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
804         * but at least the raw NTLMSSP case works.
805         */
806        /*
807         * No tcon so can't do
808         * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
809         */
810        if (rc != 0)
811                goto ssetup_exit;
812
813        ses->session_flags = le16_to_cpu(rsp->SessionFlags);
814        if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
815                cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
816ssetup_exit:
817        free_rsp_buf(resp_buftype, rsp);
818
819        /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
820        if ((phase == NtLmChallenge) && (rc == 0))
821                goto ssetup_ntlmssp_authenticate;
822
823        if (!rc) {
824                mutex_lock(&server->srv_mutex);
825                if (server->sign && server->ops->generate_signingkey) {
826                        rc = server->ops->generate_signingkey(ses);
827                        kfree(ses->auth_key.response);
828                        ses->auth_key.response = NULL;
829                        if (rc) {
830                                cifs_dbg(FYI,
831                                        "SMB3 session key generation failed\n");
832                                mutex_unlock(&server->srv_mutex);
833                                goto keygen_exit;
834                        }
835                }
836                if (!server->session_estab) {
837                        server->sequence_number = 0x2;
838                        server->session_estab = true;
839                }
840                mutex_unlock(&server->srv_mutex);
841
842                cifs_dbg(FYI, "SMB2/3 session established successfully\n");
843                spin_lock(&GlobalMid_Lock);
844                ses->status = CifsGood;
845                ses->need_reconnect = false;
846                spin_unlock(&GlobalMid_Lock);
847        }
848
849keygen_exit:
850        if (!server->sign) {
851                kfree(ses->auth_key.response);
852                ses->auth_key.response = NULL;
853        }
854        if (spnego_key) {
855                key_invalidate(spnego_key);
856                key_put(spnego_key);
857        }
858        kfree(ses->ntlmssp);
859
860        return rc;
861}
862
863int
864SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
865{
866        struct smb2_logoff_req *req; /* response is also trivial struct */
867        int rc = 0;
868        struct TCP_Server_Info *server;
869
870        cifs_dbg(FYI, "disconnect session %p\n", ses);
871
872        if (ses && (ses->server))
873                server = ses->server;
874        else
875                return -EIO;
876
877        /* no need to send SMB logoff if uid already closed due to reconnect */
878        if (ses->need_reconnect)
879                goto smb2_session_already_dead;
880
881        rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
882        if (rc)
883                return rc;
884
885         /* since no tcon, smb2_init can not do this, so do here */
886        req->hdr.SessionId = ses->Suid;
887        if (server->sign)
888                req->hdr.Flags |= SMB2_FLAGS_SIGNED;
889
890        rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
891        /*
892         * No tcon so can't do
893         * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
894         */
895
896smb2_session_already_dead:
897        return rc;
898}
899
900static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
901{
902        cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
903}
904
905#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
906
907/* These are similar values to what Windows uses */
908static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
909{
910        tcon->max_chunks = 256;
911        tcon->max_bytes_chunk = 1048576;
912        tcon->max_bytes_copy = 16777216;
913}
914
915int
916SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
917          struct cifs_tcon *tcon, const struct nls_table *cp)
918{
919        struct smb2_tree_connect_req *req;
920        struct smb2_tree_connect_rsp *rsp = NULL;
921        struct kvec iov[2];
922        int rc = 0;
923        int resp_buftype;
924        int unc_path_len;
925        struct TCP_Server_Info *server;
926        __le16 *unc_path = NULL;
927
928        cifs_dbg(FYI, "TCON\n");
929
930        if ((ses->server) && tree)
931                server = ses->server;
932        else
933                return -EIO;
934
935        if (tcon && tcon->bad_network_name)
936                return -ENOENT;
937
938        if ((tcon && tcon->seal) &&
939            ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
940                cifs_dbg(VFS, "encryption requested but no server support");
941                return -EOPNOTSUPP;
942        }
943
944        unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
945        if (unc_path == NULL)
946                return -ENOMEM;
947
948        unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
949        unc_path_len *= 2;
950        if (unc_path_len < 2) {
951                kfree(unc_path);
952                return -EINVAL;
953        }
954
955        /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
956        if (tcon)
957                tcon->tid = 0;
958
959        rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
960        if (rc) {
961                kfree(unc_path);
962                return rc;
963        }
964
965        if (tcon == NULL) {
966                /* since no tcon, smb2_init can not do this, so do here */
967                req->hdr.SessionId = ses->Suid;
968                /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
969                        req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
970        }
971
972        iov[0].iov_base = (char *)req;
973        /* 4 for rfc1002 length field and 1 for pad */
974        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
975
976        /* Testing shows that buffer offset must be at location of Buffer[0] */
977        req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
978                        - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
979        req->PathLength = cpu_to_le16(unc_path_len - 2);
980        iov[1].iov_base = unc_path;
981        iov[1].iov_len = unc_path_len;
982
983        inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
984
985        rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
986        rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
987
988        if (rc != 0) {
989                if (tcon) {
990                        cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
991                        tcon->need_reconnect = true;
992                }
993                goto tcon_error_exit;
994        }
995
996        if (tcon == NULL) {
997                ses->ipc_tid = rsp->hdr.TreeId;
998                goto tcon_exit;
999        }
1000
1001        if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
1002                cifs_dbg(FYI, "connection to disk share\n");
1003        else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
1004                tcon->ipc = true;
1005                cifs_dbg(FYI, "connection to pipe share\n");
1006        } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
1007                tcon->print = true;
1008                cifs_dbg(FYI, "connection to printer\n");
1009        } else {
1010                cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1011                rc = -EOPNOTSUPP;
1012                goto tcon_error_exit;
1013        }
1014
1015        tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1016        tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1017        tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1018        tcon->tidStatus = CifsGood;
1019        tcon->need_reconnect = false;
1020        tcon->tid = rsp->hdr.TreeId;
1021        strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1022
1023        if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1024            ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1025                cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1026        init_copy_chunk_defaults(tcon);
1027        if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1028                cifs_dbg(VFS, "Encrypted shares not supported");
1029        if (tcon->ses->server->ops->validate_negotiate)
1030                rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1031tcon_exit:
1032        free_rsp_buf(resp_buftype, rsp);
1033        kfree(unc_path);
1034        return rc;
1035
1036tcon_error_exit:
1037        if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1038                cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1039                if (tcon)
1040                        tcon->bad_network_name = true;
1041        }
1042        goto tcon_exit;
1043}
1044
1045int
1046SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1047{
1048        struct smb2_tree_disconnect_req *req; /* response is trivial */
1049        int rc = 0;
1050        struct TCP_Server_Info *server;
1051        struct cifs_ses *ses = tcon->ses;
1052
1053        cifs_dbg(FYI, "Tree Disconnect\n");
1054
1055        if (ses && (ses->server))
1056                server = ses->server;
1057        else
1058                return -EIO;
1059
1060        if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1061                return 0;
1062
1063        rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1064        if (rc)
1065                return rc;
1066
1067        rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1068        if (rc)
1069                cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1070
1071        return rc;
1072}
1073
1074
1075static struct create_durable *
1076create_durable_buf(void)
1077{
1078        struct create_durable *buf;
1079
1080        buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1081        if (!buf)
1082                return NULL;
1083
1084        buf->ccontext.DataOffset = cpu_to_le16(offsetof
1085                                        (struct create_durable, Data));
1086        buf->ccontext.DataLength = cpu_to_le32(16);
1087        buf->ccontext.NameOffset = cpu_to_le16(offsetof
1088                                (struct create_durable, Name));
1089        buf->ccontext.NameLength = cpu_to_le16(4);
1090        /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1091        buf->Name[0] = 'D';
1092        buf->Name[1] = 'H';
1093        buf->Name[2] = 'n';
1094        buf->Name[3] = 'Q';
1095        return buf;
1096}
1097
1098static struct create_durable *
1099create_reconnect_durable_buf(struct cifs_fid *fid)
1100{
1101        struct create_durable *buf;
1102
1103        buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1104        if (!buf)
1105                return NULL;
1106
1107        buf->ccontext.DataOffset = cpu_to_le16(offsetof
1108                                        (struct create_durable, Data));
1109        buf->ccontext.DataLength = cpu_to_le32(16);
1110        buf->ccontext.NameOffset = cpu_to_le16(offsetof
1111                                (struct create_durable, Name));
1112        buf->ccontext.NameLength = cpu_to_le16(4);
1113        buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1114        buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1115        /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1116        buf->Name[0] = 'D';
1117        buf->Name[1] = 'H';
1118        buf->Name[2] = 'n';
1119        buf->Name[3] = 'C';
1120        return buf;
1121}
1122
1123static __u8
1124parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1125                  unsigned int *epoch)
1126{
1127        char *data_offset;
1128        struct create_context *cc;
1129        unsigned int next;
1130        unsigned int remaining;
1131        char *name;
1132
1133        data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1134        remaining = le32_to_cpu(rsp->CreateContextsLength);
1135        cc = (struct create_context *)data_offset;
1136        while (remaining >= sizeof(struct create_context)) {
1137                name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1138                if (le16_to_cpu(cc->NameLength) == 4 &&
1139                    strncmp(name, "RqLs", 4) == 0)
1140                        return server->ops->parse_lease_buf(cc, epoch);
1141
1142                next = le32_to_cpu(cc->Next);
1143                if (!next)
1144                        break;
1145                remaining -= next;
1146                cc = (struct create_context *)((char *)cc + next);
1147        }
1148
1149        return 0;
1150}
1151
1152static int
1153add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1154                  unsigned int *num_iovec, __u8 *oplock)
1155{
1156        struct smb2_create_req *req = iov[0].iov_base;
1157        unsigned int num = *num_iovec;
1158
1159        iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1160        if (iov[num].iov_base == NULL)
1161                return -ENOMEM;
1162        iov[num].iov_len = server->vals->create_lease_size;
1163        req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1164        if (!req->CreateContextsOffset)
1165                req->CreateContextsOffset = cpu_to_le32(
1166                                sizeof(struct smb2_create_req) - 4 +
1167                                iov[num - 1].iov_len);
1168        le32_add_cpu(&req->CreateContextsLength,
1169                     server->vals->create_lease_size);
1170        inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1171        *num_iovec = num + 1;
1172        return 0;
1173}
1174
1175static struct create_durable_v2 *
1176create_durable_v2_buf(struct cifs_fid *pfid)
1177{
1178        struct create_durable_v2 *buf;
1179
1180        buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1181        if (!buf)
1182                return NULL;
1183
1184        buf->ccontext.DataOffset = cpu_to_le16(offsetof
1185                                        (struct create_durable_v2, dcontext));
1186        buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1187        buf->ccontext.NameOffset = cpu_to_le16(offsetof
1188                                (struct create_durable_v2, Name));
1189        buf->ccontext.NameLength = cpu_to_le16(4);
1190
1191        buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1192        buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1193        generate_random_uuid(buf->dcontext.CreateGuid);
1194        memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1195
1196        /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1197        buf->Name[0] = 'D';
1198        buf->Name[1] = 'H';
1199        buf->Name[2] = '2';
1200        buf->Name[3] = 'Q';
1201        return buf;
1202}
1203
1204static struct create_durable_handle_reconnect_v2 *
1205create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1206{
1207        struct create_durable_handle_reconnect_v2 *buf;
1208
1209        buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1210                        GFP_KERNEL);
1211        if (!buf)
1212                return NULL;
1213
1214        buf->ccontext.DataOffset =
1215                cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1216                                     dcontext));
1217        buf->ccontext.DataLength =
1218                cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1219        buf->ccontext.NameOffset =
1220                cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1221                            Name));
1222        buf->ccontext.NameLength = cpu_to_le16(4);
1223
1224        buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1225        buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1226        buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1227        memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1228
1229        /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1230        buf->Name[0] = 'D';
1231        buf->Name[1] = 'H';
1232        buf->Name[2] = '2';
1233        buf->Name[3] = 'C';
1234        return buf;
1235}
1236
1237static int
1238add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1239                    struct cifs_open_parms *oparms)
1240{
1241        struct smb2_create_req *req = iov[0].iov_base;
1242        unsigned int num = *num_iovec;
1243
1244        iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1245        if (iov[num].iov_base == NULL)
1246                return -ENOMEM;
1247        iov[num].iov_len = sizeof(struct create_durable_v2);
1248        if (!req->CreateContextsOffset)
1249                req->CreateContextsOffset =
1250                        cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1251                                                                iov[1].iov_len);
1252        le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1253        inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1254        *num_iovec = num + 1;
1255        return 0;
1256}
1257
1258static int
1259add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1260                    struct cifs_open_parms *oparms)
1261{
1262        struct smb2_create_req *req = iov[0].iov_base;
1263        unsigned int num = *num_iovec;
1264
1265        /* indicate that we don't need to relock the file */
1266        oparms->reconnect = false;
1267
1268        iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1269        if (iov[num].iov_base == NULL)
1270                return -ENOMEM;
1271        iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1272        if (!req->CreateContextsOffset)
1273                req->CreateContextsOffset =
1274                        cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1275                                                                iov[1].iov_len);
1276        le32_add_cpu(&req->CreateContextsLength,
1277                        sizeof(struct create_durable_handle_reconnect_v2));
1278        inc_rfc1001_len(&req->hdr,
1279                        sizeof(struct create_durable_handle_reconnect_v2));
1280        *num_iovec = num + 1;
1281        return 0;
1282}
1283
1284static int
1285add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1286                    struct cifs_open_parms *oparms, bool use_persistent)
1287{
1288        struct smb2_create_req *req = iov[0].iov_base;
1289        unsigned int num = *num_iovec;
1290
1291        if (use_persistent) {
1292                if (oparms->reconnect)
1293                        return add_durable_reconnect_v2_context(iov, num_iovec,
1294                                                                oparms);
1295                else
1296                        return add_durable_v2_context(iov, num_iovec, oparms);
1297        }
1298
1299        if (oparms->reconnect) {
1300                iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1301                /* indicate that we don't need to relock the file */
1302                oparms->reconnect = false;
1303        } else
1304                iov[num].iov_base = create_durable_buf();
1305        if (iov[num].iov_base == NULL)
1306                return -ENOMEM;
1307        iov[num].iov_len = sizeof(struct create_durable);
1308        if (!req->CreateContextsOffset)
1309                req->CreateContextsOffset =
1310                        cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1311                                                                iov[1].iov_len);
1312        le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1313        inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1314        *num_iovec = num + 1;
1315        return 0;
1316}
1317
1318int
1319SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1320          __u8 *oplock, struct smb2_file_all_info *buf,
1321          struct smb2_err_rsp **err_buf)
1322{
1323        struct smb2_create_req *req;
1324        struct smb2_create_rsp *rsp;
1325        struct TCP_Server_Info *server;
1326        struct cifs_tcon *tcon = oparms->tcon;
1327        struct cifs_ses *ses = tcon->ses;
1328        struct kvec iov[4];
1329        int resp_buftype;
1330        int uni_path_len;
1331        __le16 *copy_path = NULL;
1332        int copy_size;
1333        int rc = 0;
1334        unsigned int num_iovecs = 2;
1335        __u32 file_attributes = 0;
1336        char *dhc_buf = NULL, *lc_buf = NULL;
1337
1338        cifs_dbg(FYI, "create/open\n");
1339
1340        if (ses && (ses->server))
1341                server = ses->server;
1342        else
1343                return -EIO;
1344
1345        rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1346        if (rc)
1347                return rc;
1348
1349        if (oparms->create_options & CREATE_OPTION_READONLY)
1350                file_attributes |= ATTR_READONLY;
1351        if (oparms->create_options & CREATE_OPTION_SPECIAL)
1352                file_attributes |= ATTR_SYSTEM;
1353
1354        req->ImpersonationLevel = IL_IMPERSONATION;
1355        req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1356        /* File attributes ignored on open (used in create though) */
1357        req->FileAttributes = cpu_to_le32(file_attributes);
1358        req->ShareAccess = FILE_SHARE_ALL_LE;
1359        req->CreateDisposition = cpu_to_le32(oparms->disposition);
1360        req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1361        uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1362        /* do not count rfc1001 len field */
1363        req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1364
1365        iov[0].iov_base = (char *)req;
1366        /* 4 for rfc1002 length field */
1367        iov[0].iov_len = get_rfc1002_length(req) + 4;
1368
1369        /* MUST set path len (NameLength) to 0 opening root of share */
1370        req->NameLength = cpu_to_le16(uni_path_len - 2);
1371        /* -1 since last byte is buf[0] which is sent below (path) */
1372        iov[0].iov_len--;
1373        if (uni_path_len % 8 != 0) {
1374                copy_size = uni_path_len / 8 * 8;
1375                if (copy_size < uni_path_len)
1376                        copy_size += 8;
1377
1378                copy_path = kzalloc(copy_size, GFP_KERNEL);
1379                if (!copy_path)
1380                        return -ENOMEM;
1381                memcpy((char *)copy_path, (const char *)path,
1382                        uni_path_len);
1383                uni_path_len = copy_size;
1384                path = copy_path;
1385        }
1386
1387        iov[1].iov_len = uni_path_len;
1388        iov[1].iov_base = path;
1389        /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1390        inc_rfc1001_len(req, uni_path_len - 1);
1391
1392        if (!server->oplocks)
1393                *oplock = SMB2_OPLOCK_LEVEL_NONE;
1394
1395        if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1396            *oplock == SMB2_OPLOCK_LEVEL_NONE)
1397                req->RequestedOplockLevel = *oplock;
1398        else {
1399                rc = add_lease_context(server, iov, &num_iovecs, oplock);
1400                if (rc) {
1401                        cifs_small_buf_release(req);
1402                        kfree(copy_path);
1403                        return rc;
1404                }
1405                lc_buf = iov[num_iovecs-1].iov_base;
1406        }
1407
1408        if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1409                /* need to set Next field of lease context if we request it */
1410                if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1411                        struct create_context *ccontext =
1412                            (struct create_context *)iov[num_iovecs-1].iov_base;
1413                        ccontext->Next =
1414                                cpu_to_le32(server->vals->create_lease_size);
1415                }
1416
1417                rc = add_durable_context(iov, &num_iovecs, oparms,
1418                                        tcon->use_persistent);
1419                if (rc) {
1420                        cifs_small_buf_release(req);
1421                        kfree(copy_path);
1422                        kfree(lc_buf);
1423                        return rc;
1424                }
1425                dhc_buf = iov[num_iovecs-1].iov_base;
1426        }
1427
1428        rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1429        rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1430
1431        if (rc != 0) {
1432                cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1433                if (err_buf)
1434                        *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1435                                           GFP_KERNEL);
1436                goto creat_exit;
1437        }
1438
1439        oparms->fid->persistent_fid = rsp->PersistentFileId;
1440        oparms->fid->volatile_fid = rsp->VolatileFileId;
1441
1442        if (buf) {
1443                memcpy(buf, &rsp->CreationTime, 32);
1444                buf->AllocationSize = rsp->AllocationSize;
1445                buf->EndOfFile = rsp->EndofFile;
1446                buf->Attributes = rsp->FileAttributes;
1447                buf->NumberOfLinks = cpu_to_le32(1);
1448                buf->DeletePending = 0;
1449        }
1450
1451        if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1452                *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1453        else
1454                *oplock = rsp->OplockLevel;
1455creat_exit:
1456        kfree(copy_path);
1457        kfree(lc_buf);
1458        kfree(dhc_buf);
1459        free_rsp_buf(resp_buftype, rsp);
1460        return rc;
1461}
1462
1463/*
1464 *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1465 */
1466int
1467SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1468           u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1469           u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1470{
1471        struct smb2_ioctl_req *req;
1472        struct smb2_ioctl_rsp *rsp;
1473        struct TCP_Server_Info *server;
1474        struct cifs_ses *ses;
1475        struct kvec iov[2];
1476        int resp_buftype;
1477        int num_iovecs;
1478        int rc = 0;
1479
1480        cifs_dbg(FYI, "SMB2 IOCTL\n");
1481
1482        if (out_data != NULL)
1483                *out_data = NULL;
1484
1485        /* zero out returned data len, in case of error */
1486        if (plen)
1487                *plen = 0;
1488
1489        if (tcon)
1490                ses = tcon->ses;
1491        else
1492                return -EIO;
1493
1494        if (ses && (ses->server))
1495                server = ses->server;
1496        else
1497                return -EIO;
1498
1499        rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1500        if (rc)
1501                return rc;
1502
1503        req->CtlCode = cpu_to_le32(opcode);
1504        req->PersistentFileId = persistent_fid;
1505        req->VolatileFileId = volatile_fid;
1506
1507        if (indatalen) {
1508                req->InputCount = cpu_to_le32(indatalen);
1509                /* do not set InputOffset if no input data */
1510                req->InputOffset =
1511                       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1512                iov[1].iov_base = in_data;
1513                iov[1].iov_len = indatalen;
1514                num_iovecs = 2;
1515        } else
1516                num_iovecs = 1;
1517
1518        req->OutputOffset = 0;
1519        req->OutputCount = 0; /* MBZ */
1520
1521        /*
1522         * Could increase MaxOutputResponse, but that would require more
1523         * than one credit. Windows typically sets this smaller, but for some
1524         * ioctls it may be useful to allow server to send more. No point
1525         * limiting what the server can send as long as fits in one credit
1526         */
1527        req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1528
1529        if (is_fsctl)
1530                req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1531        else
1532                req->Flags = 0;
1533
1534        iov[0].iov_base = (char *)req;
1535
1536        /*
1537         * If no input data, the size of ioctl struct in
1538         * protocol spec still includes a 1 byte data buffer,
1539         * but if input data passed to ioctl, we do not
1540         * want to double count this, so we do not send
1541         * the dummy one byte of data in iovec[0] if sending
1542         * input data (in iovec[1]). We also must add 4 bytes
1543         * in first iovec to allow for rfc1002 length field.
1544         */
1545
1546        if (indatalen) {
1547                iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1548                inc_rfc1001_len(req, indatalen - 1);
1549        } else
1550                iov[0].iov_len = get_rfc1002_length(req) + 4;
1551
1552
1553        rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1554        rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1555
1556        if ((rc != 0) && (rc != -EINVAL)) {
1557                cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1558                goto ioctl_exit;
1559        } else if (rc == -EINVAL) {
1560                if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1561                    (opcode != FSCTL_SRV_COPYCHUNK)) {
1562                        cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1563                        goto ioctl_exit;
1564                }
1565        }
1566
1567        /* check if caller wants to look at return data or just return rc */
1568        if ((plen == NULL) || (out_data == NULL))
1569                goto ioctl_exit;
1570
1571        *plen = le32_to_cpu(rsp->OutputCount);
1572
1573        /* We check for obvious errors in the output buffer length and offset */
1574        if (*plen == 0)
1575                goto ioctl_exit; /* server returned no data */
1576        else if (*plen > 0xFF00) {
1577                cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1578                *plen = 0;
1579                rc = -EIO;
1580                goto ioctl_exit;
1581        }
1582
1583        if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1584                cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1585                        le32_to_cpu(rsp->OutputOffset));
1586                *plen = 0;
1587                rc = -EIO;
1588                goto ioctl_exit;
1589        }
1590
1591        *out_data = kmalloc(*plen, GFP_KERNEL);
1592        if (*out_data == NULL) {
1593                rc = -ENOMEM;
1594                goto ioctl_exit;
1595        }
1596
1597        memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1598               *plen);
1599ioctl_exit:
1600        free_rsp_buf(resp_buftype, rsp);
1601        return rc;
1602}
1603
1604/*
1605 *   Individual callers to ioctl worker function follow
1606 */
1607
1608int
1609SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1610                     u64 persistent_fid, u64 volatile_fid)
1611{
1612        int rc;
1613        struct  compress_ioctl fsctl_input;
1614        char *ret_data = NULL;
1615
1616        fsctl_input.CompressionState =
1617                        cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1618
1619        rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1620                        FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1621                        (char *)&fsctl_input /* data input */,
1622                        2 /* in data len */, &ret_data /* out data */, NULL);
1623
1624        cifs_dbg(FYI, "set compression rc %d\n", rc);
1625
1626        return rc;
1627}
1628
1629int
1630SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1631           u64 persistent_fid, u64 volatile_fid)
1632{
1633        struct smb2_close_req *req;
1634        struct smb2_close_rsp *rsp;
1635        struct TCP_Server_Info *server;
1636        struct cifs_ses *ses = tcon->ses;
1637        struct kvec iov[1];
1638        int resp_buftype;
1639        int rc = 0;
1640
1641        cifs_dbg(FYI, "Close\n");
1642
1643        if (ses && (ses->server))
1644                server = ses->server;
1645        else
1646                return -EIO;
1647
1648        rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1649        if (rc)
1650                return rc;
1651
1652        req->PersistentFileId = persistent_fid;
1653        req->VolatileFileId = volatile_fid;
1654
1655        iov[0].iov_base = (char *)req;
1656        /* 4 for rfc1002 length field */
1657        iov[0].iov_len = get_rfc1002_length(req) + 4;
1658
1659        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1660        rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1661
1662        if (rc != 0) {
1663                cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1664                goto close_exit;
1665        }
1666
1667        /* BB FIXME - decode close response, update inode for caching */
1668
1669close_exit:
1670        free_rsp_buf(resp_buftype, rsp);
1671        return rc;
1672}
1673
1674static int
1675validate_buf(unsigned int offset, unsigned int buffer_length,
1676             struct smb2_hdr *hdr, unsigned int min_buf_size)
1677
1678{
1679        unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1680        char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1681        char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1682        char *end_of_buf = begin_of_buf + buffer_length;
1683
1684
1685        if (buffer_length < min_buf_size) {
1686                cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1687                         buffer_length, min_buf_size);
1688                return -EINVAL;
1689        }
1690
1691        /* check if beyond RFC1001 maximum length */
1692        if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1693                cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1694                         buffer_length, smb_len);
1695                return -EINVAL;
1696        }
1697
1698        if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1699                cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1700                return -EINVAL;
1701        }
1702
1703        return 0;
1704}
1705
1706/*
1707 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1708 * Caller must free buffer.
1709 */
1710static int
1711validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1712                      struct smb2_hdr *hdr, unsigned int minbufsize,
1713                      char *data)
1714
1715{
1716        char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1717        int rc;
1718
1719        if (!data)
1720                return -EINVAL;
1721
1722        rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1723        if (rc)
1724                return rc;
1725
1726        memcpy(data, begin_of_buf, buffer_length);
1727
1728        return 0;
1729}
1730
1731static int
1732query_info(const unsigned int xid, struct cifs_tcon *tcon,
1733           u64 persistent_fid, u64 volatile_fid, u8 info_class,
1734           size_t output_len, size_t min_len, void *data)
1735{
1736        struct smb2_query_info_req *req;
1737        struct smb2_query_info_rsp *rsp = NULL;
1738        struct kvec iov[2];
1739        int rc = 0;
1740        int resp_buftype;
1741        struct TCP_Server_Info *server;
1742        struct cifs_ses *ses = tcon->ses;
1743
1744        cifs_dbg(FYI, "Query Info\n");
1745
1746        if (ses && (ses->server))
1747                server = ses->server;
1748        else
1749                return -EIO;
1750
1751        rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1752        if (rc)
1753                return rc;
1754
1755        req->InfoType = SMB2_O_INFO_FILE;
1756        req->FileInfoClass = info_class;
1757        req->PersistentFileId = persistent_fid;
1758        req->VolatileFileId = volatile_fid;
1759        /* 4 for rfc1002 length field and 1 for Buffer */
1760        req->InputBufferOffset =
1761                cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1762        req->OutputBufferLength = cpu_to_le32(output_len);
1763
1764        iov[0].iov_base = (char *)req;
1765        /* 4 for rfc1002 length field */
1766        iov[0].iov_len = get_rfc1002_length(req) + 4;
1767
1768        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1769        rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1770
1771        if (rc) {
1772                cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1773                goto qinf_exit;
1774        }
1775
1776        rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1777                                   le32_to_cpu(rsp->OutputBufferLength),
1778                                   &rsp->hdr, min_len, data);
1779
1780qinf_exit:
1781        free_rsp_buf(resp_buftype, rsp);
1782        return rc;
1783}
1784
1785int
1786SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1787                u64 persistent_fid, u64 volatile_fid,
1788                struct smb2_file_all_info *data)
1789{
1790        return query_info(xid, tcon, persistent_fid, volatile_fid,
1791                          FILE_ALL_INFORMATION,
1792                          sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1793                          sizeof(struct smb2_file_all_info), data);
1794}
1795
1796int
1797SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1798                 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1799{
1800        return query_info(xid, tcon, persistent_fid, volatile_fid,
1801                          FILE_INTERNAL_INFORMATION,
1802                          sizeof(struct smb2_file_internal_info),
1803                          sizeof(struct smb2_file_internal_info), uniqueid);
1804}
1805
1806/*
1807 * This is a no-op for now. We're not really interested in the reply, but
1808 * rather in the fact that the server sent one and that server->lstrp
1809 * gets updated.
1810 *
1811 * FIXME: maybe we should consider checking that the reply matches request?
1812 */
1813static void
1814smb2_echo_callback(struct mid_q_entry *mid)
1815{
1816        struct TCP_Server_Info *server = mid->callback_data;
1817        struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1818        unsigned int credits_received = 1;
1819
1820        if (mid->mid_state == MID_RESPONSE_RECEIVED)
1821                credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1822
1823        mutex_lock(&server->srv_mutex);
1824        DeleteMidQEntry(mid);
1825        mutex_unlock(&server->srv_mutex);
1826        add_credits(server, credits_received, CIFS_ECHO_OP);
1827}
1828
1829void smb2_reconnect_server(struct work_struct *work)
1830{
1831        struct TCP_Server_Info *server = container_of(work,
1832                                        struct TCP_Server_Info, reconnect.work);
1833        struct cifs_ses *ses;
1834        struct cifs_tcon *tcon, *tcon2;
1835        struct list_head tmp_list;
1836        int tcon_exist = false;
1837
1838        /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
1839        mutex_lock(&server->reconnect_mutex);
1840
1841        INIT_LIST_HEAD(&tmp_list);
1842        cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
1843
1844        spin_lock(&cifs_tcp_ses_lock);
1845        list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1846                list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
1847                        if (tcon->need_reconnect) {
1848                                tcon->tc_count++;
1849                                list_add_tail(&tcon->rlist, &tmp_list);
1850                                tcon_exist = true;
1851                        }
1852                }
1853        }
1854        /*
1855         * Get the reference to server struct to be sure that the last call of
1856         * cifs_put_tcon() in the loop below won't release the server pointer.
1857         */
1858        if (tcon_exist)
1859                server->srv_count++;
1860
1861        spin_unlock(&cifs_tcp_ses_lock);
1862
1863        list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
1864                smb2_reconnect(SMB2_ECHO, tcon);
1865                list_del_init(&tcon->rlist);
1866                cifs_put_tcon(tcon);
1867        }
1868
1869        cifs_dbg(FYI, "Reconnecting tcons finished\n");
1870        mutex_unlock(&server->reconnect_mutex);
1871
1872        /* now we can safely release srv struct */
1873        if (tcon_exist)
1874                cifs_put_tcp_session(server, 1);
1875}
1876
1877int
1878SMB2_echo(struct TCP_Server_Info *server)
1879{
1880        struct smb2_echo_req *req;
1881        int rc = 0;
1882        struct kvec iov;
1883        struct smb_rqst rqst = { .rq_iov = &iov,
1884                                 .rq_nvec = 1 };
1885
1886        cifs_dbg(FYI, "In echo request\n");
1887
1888        if (server->tcpStatus == CifsNeedNegotiate) {
1889                /* No need to send echo on newly established connections */
1890                queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
1891                return rc;
1892        }
1893
1894        rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1895        if (rc)
1896                return rc;
1897
1898        req->hdr.CreditRequest = cpu_to_le16(1);
1899
1900        iov.iov_base = (char *)req;
1901        /* 4 for rfc1002 length field */
1902        iov.iov_len = get_rfc1002_length(req) + 4;
1903
1904        rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1905                             CIFS_ECHO_OP);
1906        if (rc)
1907                cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1908
1909        cifs_small_buf_release(req);
1910        return rc;
1911}
1912
1913int
1914SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1915           u64 volatile_fid)
1916{
1917        struct smb2_flush_req *req;
1918        struct TCP_Server_Info *server;
1919        struct cifs_ses *ses = tcon->ses;
1920        struct kvec iov[1];
1921        int resp_buftype;
1922        int rc = 0;
1923
1924        cifs_dbg(FYI, "Flush\n");
1925
1926        if (ses && (ses->server))
1927                server = ses->server;
1928        else
1929                return -EIO;
1930
1931        rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1932        if (rc)
1933                return rc;
1934
1935        req->PersistentFileId = persistent_fid;
1936        req->VolatileFileId = volatile_fid;
1937
1938        iov[0].iov_base = (char *)req;
1939        /* 4 for rfc1002 length field */
1940        iov[0].iov_len = get_rfc1002_length(req) + 4;
1941
1942        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1943
1944        if (rc != 0)
1945                cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1946
1947        free_rsp_buf(resp_buftype, iov[0].iov_base);
1948        return rc;
1949}
1950
1951/*
1952 * To form a chain of read requests, any read requests after the first should
1953 * have the end_of_chain boolean set to true.
1954 */
1955static int
1956smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1957                  unsigned int remaining_bytes, int request_type)
1958{
1959        int rc = -EACCES;
1960        struct smb2_read_req *req = NULL;
1961
1962        rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1963        if (rc)
1964                return rc;
1965        if (io_parms->tcon->ses->server == NULL)
1966                return -ECONNABORTED;
1967
1968        req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1969
1970        req->PersistentFileId = io_parms->persistent_fid;
1971        req->VolatileFileId = io_parms->volatile_fid;
1972        req->ReadChannelInfoOffset = 0; /* reserved */
1973        req->ReadChannelInfoLength = 0; /* reserved */
1974        req->Channel = 0; /* reserved */
1975        req->MinimumCount = 0;
1976        req->Length = cpu_to_le32(io_parms->length);
1977        req->Offset = cpu_to_le64(io_parms->offset);
1978
1979        if (request_type & CHAINED_REQUEST) {
1980                if (!(request_type & END_OF_CHAIN)) {
1981                        /* 4 for rfc1002 length field */
1982                        req->hdr.NextCommand =
1983                                cpu_to_le32(get_rfc1002_length(req) + 4);
1984                } else /* END_OF_CHAIN */
1985                        req->hdr.NextCommand = 0;
1986                if (request_type & RELATED_REQUEST) {
1987                        req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1988                        /*
1989                         * Related requests use info from previous read request
1990                         * in chain.
1991                         */
1992                        req->hdr.SessionId = 0xFFFFFFFF;
1993                        req->hdr.TreeId = 0xFFFFFFFF;
1994                        req->PersistentFileId = 0xFFFFFFFF;
1995                        req->VolatileFileId = 0xFFFFFFFF;
1996                }
1997        }
1998        if (remaining_bytes > io_parms->length)
1999                req->RemainingBytes = cpu_to_le32(remaining_bytes);
2000        else
2001                req->RemainingBytes = 0;
2002
2003        iov[0].iov_base = (char *)req;
2004        /* 4 for rfc1002 length field */
2005        iov[0].iov_len = get_rfc1002_length(req) + 4;
2006        return rc;
2007}
2008
2009static void
2010smb2_readv_callback(struct mid_q_entry *mid)
2011{
2012        struct cifs_readdata *rdata = mid->callback_data;
2013        struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2014        struct TCP_Server_Info *server = tcon->ses->server;
2015        struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
2016        unsigned int credits_received = 1;
2017        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2018                                 .rq_nvec = 1,
2019                                 .rq_pages = rdata->pages,
2020                                 .rq_npages = rdata->nr_pages,
2021                                 .rq_pagesz = rdata->pagesz,
2022                                 .rq_tailsz = rdata->tailsz };
2023
2024        cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2025                 __func__, mid->mid, mid->mid_state, rdata->result,
2026                 rdata->bytes);
2027
2028        switch (mid->mid_state) {
2029        case MID_RESPONSE_RECEIVED:
2030                credits_received = le16_to_cpu(buf->CreditRequest);
2031                /* result already set, check signature */
2032                if (server->sign) {
2033                        int rc;
2034
2035                        rc = smb2_verify_signature(&rqst, server);
2036                        if (rc)
2037                                cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2038                                         rc);
2039                }
2040                /* FIXME: should this be counted toward the initiating task? */
2041                task_io_account_read(rdata->got_bytes);
2042                cifs_stats_bytes_read(tcon, rdata->got_bytes);
2043                break;
2044        case MID_REQUEST_SUBMITTED:
2045        case MID_RETRY_NEEDED:
2046                rdata->result = -EAGAIN;
2047                if (server->sign && rdata->got_bytes)
2048                        /* reset bytes number since we can not check a sign */
2049                        rdata->got_bytes = 0;
2050                /* FIXME: should this be counted toward the initiating task? */
2051                task_io_account_read(rdata->got_bytes);
2052                cifs_stats_bytes_read(tcon, rdata->got_bytes);
2053                break;
2054        default:
2055                if (rdata->result != -ENODATA)
2056                        rdata->result = -EIO;
2057        }
2058
2059        if (rdata->result)
2060                cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2061
2062        queue_work(cifsiod_wq, &rdata->work);
2063        mutex_lock(&server->srv_mutex);
2064        DeleteMidQEntry(mid);
2065        mutex_unlock(&server->srv_mutex);
2066        add_credits(server, credits_received, 0);
2067}
2068
2069/* smb2_async_readv - send an async write, and set up mid to handle result */
2070int
2071smb2_async_readv(struct cifs_readdata *rdata)
2072{
2073        int rc, flags = 0;
2074        struct smb2_hdr *buf;
2075        struct cifs_io_parms io_parms;
2076        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2077                                 .rq_nvec = 1 };
2078        struct TCP_Server_Info *server;
2079
2080        cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2081                 __func__, rdata->offset, rdata->bytes);
2082
2083        io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2084        io_parms.offset = rdata->offset;
2085        io_parms.length = rdata->bytes;
2086        io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2087        io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2088        io_parms.pid = rdata->pid;
2089
2090        server = io_parms.tcon->ses->server;
2091
2092        rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2093        if (rc) {
2094                if (rc == -EAGAIN && rdata->credits) {
2095                        /* credits was reset by reconnect */
2096                        rdata->credits = 0;
2097                        /* reduce in_flight value since we won't send the req */
2098                        spin_lock(&server->req_lock);
2099                        server->in_flight--;
2100                        spin_unlock(&server->req_lock);
2101                }
2102                return rc;
2103        }
2104
2105        buf = (struct smb2_hdr *)rdata->iov.iov_base;
2106        /* 4 for rfc1002 length field */
2107        rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2108
2109        if (rdata->credits) {
2110                buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2111                                                SMB2_MAX_BUFFER_SIZE));
2112                buf->CreditRequest = buf->CreditCharge;
2113                spin_lock(&server->req_lock);
2114                server->credits += rdata->credits -
2115                                                le16_to_cpu(buf->CreditCharge);
2116                spin_unlock(&server->req_lock);
2117                wake_up(&server->request_q);
2118                flags = CIFS_HAS_CREDITS;
2119        }
2120
2121        kref_get(&rdata->refcount);
2122        rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2123                             cifs_readv_receive, smb2_readv_callback,
2124                             rdata, flags);
2125        if (rc) {
2126                kref_put(&rdata->refcount, cifs_readdata_release);
2127                cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2128        }
2129
2130        cifs_small_buf_release(buf);
2131        return rc;
2132}
2133
2134int
2135SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2136          unsigned int *nbytes, char **buf, int *buf_type)
2137{
2138        int resp_buftype, rc = -EACCES;
2139        struct smb2_read_rsp *rsp = NULL;
2140        struct kvec iov[1];
2141
2142        *nbytes = 0;
2143        rc = smb2_new_read_req(iov, io_parms, 0, 0);
2144        if (rc)
2145                return rc;
2146
2147        rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2148                          &resp_buftype, CIFS_LOG_ERROR);
2149
2150        rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2151
2152        if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2153                free_rsp_buf(resp_buftype, iov[0].iov_base);
2154                return 0;
2155        }
2156
2157        if (rc) {
2158                cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2159                cifs_dbg(VFS, "Send error in read = %d\n", rc);
2160        } else {
2161                *nbytes = le32_to_cpu(rsp->DataLength);
2162                if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2163                    (*nbytes > io_parms->length)) {
2164                        cifs_dbg(FYI, "bad length %d for count %d\n",
2165                                 *nbytes, io_parms->length);
2166                        rc = -EIO;
2167                        *nbytes = 0;
2168                }
2169        }
2170
2171        if (*buf) {
2172                memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
2173                       *nbytes);
2174                free_rsp_buf(resp_buftype, iov[0].iov_base);
2175        } else if (resp_buftype != CIFS_NO_BUFFER) {
2176                *buf = iov[0].iov_base;
2177                if (resp_buftype == CIFS_SMALL_BUFFER)
2178                        *buf_type = CIFS_SMALL_BUFFER;
2179                else if (resp_buftype == CIFS_LARGE_BUFFER)
2180                        *buf_type = CIFS_LARGE_BUFFER;
2181        }
2182        return rc;
2183}
2184
2185/*
2186 * Check the mid_state and signature on received buffer (if any), and queue the
2187 * workqueue completion task.
2188 */
2189static void
2190smb2_writev_callback(struct mid_q_entry *mid)
2191{
2192        struct cifs_writedata *wdata = mid->callback_data;
2193        struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2194        struct TCP_Server_Info *server = tcon->ses->server;
2195        unsigned int written;
2196        struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2197        unsigned int credits_received = 1;
2198
2199        switch (mid->mid_state) {
2200        case MID_RESPONSE_RECEIVED:
2201                credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2202                wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2203                if (wdata->result != 0)
2204                        break;
2205
2206                written = le32_to_cpu(rsp->DataLength);
2207                /*
2208                 * Mask off high 16 bits when bytes written as returned
2209                 * by the server is greater than bytes requested by the
2210                 * client. OS/2 servers are known to set incorrect
2211                 * CountHigh values.
2212                 */
2213                if (written > wdata->bytes)
2214                        written &= 0xFFFF;
2215
2216                if (written < wdata->bytes)
2217                        wdata->result = -ENOSPC;
2218                else
2219                        wdata->bytes = written;
2220                break;
2221        case MID_REQUEST_SUBMITTED:
2222        case MID_RETRY_NEEDED:
2223                wdata->result = -EAGAIN;
2224                break;
2225        default:
2226                wdata->result = -EIO;
2227                break;
2228        }
2229
2230        if (wdata->result)
2231                cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2232
2233        queue_work(cifsiod_wq, &wdata->work);
2234        mutex_lock(&server->srv_mutex);
2235        DeleteMidQEntry(mid);
2236        mutex_unlock(&server->srv_mutex);
2237        add_credits(tcon->ses->server, credits_received, 0);
2238}
2239
2240/* smb2_async_writev - send an async write, and set up mid to handle result */
2241int
2242smb2_async_writev(struct cifs_writedata *wdata,
2243                  void (*release)(struct kref *kref))
2244{
2245        int rc = -EACCES, flags = 0;
2246        struct smb2_write_req *req = NULL;
2247        struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2248        struct TCP_Server_Info *server = tcon->ses->server;
2249        struct kvec iov;
2250        struct smb_rqst rqst;
2251
2252        rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2253        if (rc) {
2254                if (rc == -EAGAIN && wdata->credits) {
2255                        /* credits was reset by reconnect */
2256                        wdata->credits = 0;
2257                        /* reduce in_flight value since we won't send the req */
2258                        spin_lock(&server->req_lock);
2259                        server->in_flight--;
2260                        spin_unlock(&server->req_lock);
2261                }
2262                goto async_writev_out;
2263        }
2264
2265        req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2266
2267        req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2268        req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2269        req->WriteChannelInfoOffset = 0;
2270        req->WriteChannelInfoLength = 0;
2271        req->Channel = 0;
2272        req->Offset = cpu_to_le64(wdata->offset);
2273        /* 4 for rfc1002 length field */
2274        req->DataOffset = cpu_to_le16(
2275                                offsetof(struct smb2_write_req, Buffer) - 4);
2276        req->RemainingBytes = 0;
2277
2278        /* 4 for rfc1002 length field and 1 for Buffer */
2279        iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2280        iov.iov_base = req;
2281
2282        rqst.rq_iov = &iov;
2283        rqst.rq_nvec = 1;
2284        rqst.rq_pages = wdata->pages;
2285        rqst.rq_npages = wdata->nr_pages;
2286        rqst.rq_pagesz = wdata->pagesz;
2287        rqst.rq_tailsz = wdata->tailsz;
2288
2289        cifs_dbg(FYI, "async write at %llu %u bytes\n",
2290                 wdata->offset, wdata->bytes);
2291
2292        req->Length = cpu_to_le32(wdata->bytes);
2293
2294        inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2295
2296        if (wdata->credits) {
2297                req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2298                                                    SMB2_MAX_BUFFER_SIZE));
2299                req->hdr.CreditRequest = req->hdr.CreditCharge;
2300                spin_lock(&server->req_lock);
2301                server->credits += wdata->credits -
2302                                        le16_to_cpu(req->hdr.CreditCharge);
2303                spin_unlock(&server->req_lock);
2304                wake_up(&server->request_q);
2305                flags = CIFS_HAS_CREDITS;
2306        }
2307
2308        kref_get(&wdata->refcount);
2309        rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2310                             flags);
2311
2312        if (rc) {
2313                kref_put(&wdata->refcount, release);
2314                cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2315        }
2316
2317async_writev_out:
2318        cifs_small_buf_release(req);
2319        return rc;
2320}
2321
2322/*
2323 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2324 * The length field from io_parms must be at least 1 and indicates a number of
2325 * elements with data to write that begins with position 1 in iov array. All
2326 * data length is specified by count.
2327 */
2328int
2329SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2330           unsigned int *nbytes, struct kvec *iov, int n_vec)
2331{
2332        int rc = 0;
2333        struct smb2_write_req *req = NULL;
2334        struct smb2_write_rsp *rsp = NULL;
2335        int resp_buftype;
2336        *nbytes = 0;
2337
2338        if (n_vec < 1)
2339                return rc;
2340
2341        rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2342        if (rc)
2343                return rc;
2344
2345        if (io_parms->tcon->ses->server == NULL)
2346                return -ECONNABORTED;
2347
2348        req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2349
2350        req->PersistentFileId = io_parms->persistent_fid;
2351        req->VolatileFileId = io_parms->volatile_fid;
2352        req->WriteChannelInfoOffset = 0;
2353        req->WriteChannelInfoLength = 0;
2354        req->Channel = 0;
2355        req->Length = cpu_to_le32(io_parms->length);
2356        req->Offset = cpu_to_le64(io_parms->offset);
2357        /* 4 for rfc1002 length field */
2358        req->DataOffset = cpu_to_le16(
2359                                offsetof(struct smb2_write_req, Buffer) - 4);
2360        req->RemainingBytes = 0;
2361
2362        iov[0].iov_base = (char *)req;
2363        /* 4 for rfc1002 length field and 1 for Buffer */
2364        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2365
2366        /* length of entire message including data to be written */
2367        inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2368
2369        rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2370                          &resp_buftype, 0);
2371        rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2372
2373        if (rc) {
2374                cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2375                cifs_dbg(VFS, "Send error in write = %d\n", rc);
2376        } else
2377                *nbytes = le32_to_cpu(rsp->DataLength);
2378
2379        free_rsp_buf(resp_buftype, rsp);
2380        return rc;
2381}
2382
2383static unsigned int
2384num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2385{
2386        int len;
2387        unsigned int entrycount = 0;
2388        unsigned int next_offset = 0;
2389        FILE_DIRECTORY_INFO *entryptr;
2390
2391        if (bufstart == NULL)
2392                return 0;
2393
2394        entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2395
2396        while (1) {
2397                entryptr = (FILE_DIRECTORY_INFO *)
2398                                        ((char *)entryptr + next_offset);
2399
2400                if ((char *)entryptr + size > end_of_buf) {
2401                        cifs_dbg(VFS, "malformed search entry would overflow\n");
2402                        break;
2403                }
2404
2405                len = le32_to_cpu(entryptr->FileNameLength);
2406                if ((char *)entryptr + len + size > end_of_buf) {
2407                        cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2408                                 end_of_buf);
2409                        break;
2410                }
2411
2412                *lastentry = (char *)entryptr;
2413                entrycount++;
2414
2415                next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2416                if (!next_offset)
2417                        break;
2418        }
2419
2420        return entrycount;
2421}
2422
2423/*
2424 * Readdir/FindFirst
2425 */
2426int
2427SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2428                     u64 persistent_fid, u64 volatile_fid, int index,
2429                     struct cifs_search_info *srch_inf)
2430{
2431        struct smb2_query_directory_req *req;
2432        struct smb2_query_directory_rsp *rsp = NULL;
2433        struct kvec iov[2];
2434        int rc = 0;
2435        int len;
2436        int resp_buftype = CIFS_NO_BUFFER;
2437        unsigned char *bufptr;
2438        struct TCP_Server_Info *server;
2439        struct cifs_ses *ses = tcon->ses;
2440        __le16 asteriks = cpu_to_le16('*');
2441        char *end_of_smb;
2442        unsigned int output_size = CIFSMaxBufSize;
2443        size_t info_buf_size;
2444
2445        if (ses && (ses->server))
2446                server = ses->server;
2447        else
2448                return -EIO;
2449
2450        rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2451        if (rc)
2452                return rc;
2453
2454        switch (srch_inf->info_level) {
2455        case SMB_FIND_FILE_DIRECTORY_INFO:
2456                req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2457                info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2458                break;
2459        case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2460                req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2461                info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2462                break;
2463        default:
2464                cifs_dbg(VFS, "info level %u isn't supported\n",
2465                         srch_inf->info_level);
2466                rc = -EINVAL;
2467                goto qdir_exit;
2468        }
2469
2470        req->FileIndex = cpu_to_le32(index);
2471        req->PersistentFileId = persistent_fid;
2472        req->VolatileFileId = volatile_fid;
2473
2474        len = 0x2;
2475        bufptr = req->Buffer;
2476        memcpy(bufptr, &asteriks, len);
2477
2478        req->FileNameOffset =
2479                cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2480        req->FileNameLength = cpu_to_le16(len);
2481        /*
2482         * BB could be 30 bytes or so longer if we used SMB2 specific
2483         * buffer lengths, but this is safe and close enough.
2484         */
2485        output_size = min_t(unsigned int, output_size, server->maxBuf);
2486        output_size = min_t(unsigned int, output_size, 2 << 15);
2487        req->OutputBufferLength = cpu_to_le32(output_size);
2488
2489        iov[0].iov_base = (char *)req;
2490        /* 4 for RFC1001 length and 1 for Buffer */
2491        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2492
2493        iov[1].iov_base = (char *)(req->Buffer);
2494        iov[1].iov_len = len;
2495
2496        inc_rfc1001_len(req, len - 1 /* Buffer */);
2497
2498        rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2499        rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2500
2501        if (rc) {
2502                if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2503                        srch_inf->endOfSearch = true;
2504                        rc = 0;
2505                }
2506                cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2507                goto qdir_exit;
2508        }
2509
2510        rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2511                          le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2512                          info_buf_size);
2513        if (rc)
2514                goto qdir_exit;
2515
2516        srch_inf->unicode = true;
2517
2518        if (srch_inf->ntwrk_buf_start) {
2519                if (srch_inf->smallBuf)
2520                        cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2521                else
2522                        cifs_buf_release(srch_inf->ntwrk_buf_start);
2523        }
2524        srch_inf->ntwrk_buf_start = (char *)rsp;
2525        srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2526                (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2527        /* 4 for rfc1002 length field */
2528        end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2529        srch_inf->entries_in_buffer =
2530                        num_entries(srch_inf->srch_entries_start, end_of_smb,
2531                                    &srch_inf->last_entry, info_buf_size);
2532        srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2533        cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2534                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2535                 srch_inf->srch_entries_start, srch_inf->last_entry);
2536        if (resp_buftype == CIFS_LARGE_BUFFER)
2537                srch_inf->smallBuf = false;
2538        else if (resp_buftype == CIFS_SMALL_BUFFER)
2539                srch_inf->smallBuf = true;
2540        else
2541                cifs_dbg(VFS, "illegal search buffer type\n");
2542
2543        return rc;
2544
2545qdir_exit:
2546        free_rsp_buf(resp_buftype, rsp);
2547        return rc;
2548}
2549
2550static int
2551send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2552               u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2553               unsigned int num, void **data, unsigned int *size)
2554{
2555        struct smb2_set_info_req *req;
2556        struct smb2_set_info_rsp *rsp = NULL;
2557        struct kvec *iov;
2558        int rc = 0;
2559        int resp_buftype;
2560        unsigned int i;
2561        struct TCP_Server_Info *server;
2562        struct cifs_ses *ses = tcon->ses;
2563
2564        if (ses && (ses->server))
2565                server = ses->server;
2566        else
2567                return -EIO;
2568
2569        if (!num)
2570                return -EINVAL;
2571
2572        iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2573        if (!iov)
2574                return -ENOMEM;
2575
2576        rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2577        if (rc) {
2578                kfree(iov);
2579                return rc;
2580        }
2581
2582        req->hdr.ProcessId = cpu_to_le32(pid);
2583
2584        req->InfoType = SMB2_O_INFO_FILE;
2585        req->FileInfoClass = info_class;
2586        req->PersistentFileId = persistent_fid;
2587        req->VolatileFileId = volatile_fid;
2588
2589        /* 4 for RFC1001 length and 1 for Buffer */
2590        req->BufferOffset =
2591                        cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2592        req->BufferLength = cpu_to_le32(*size);
2593
2594        inc_rfc1001_len(req, *size - 1 /* Buffer */);
2595
2596        memcpy(req->Buffer, *data, *size);
2597
2598        iov[0].iov_base = (char *)req;
2599        /* 4 for RFC1001 length */
2600        iov[0].iov_len = get_rfc1002_length(req) + 4;
2601
2602        for (i = 1; i < num; i++) {
2603                inc_rfc1001_len(req, size[i]);
2604                le32_add_cpu(&req->BufferLength, size[i]);
2605                iov[i].iov_base = (char *)data[i];
2606                iov[i].iov_len = size[i];
2607        }
2608
2609        rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2610        rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2611
2612        if (rc != 0)
2613                cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2614
2615        free_rsp_buf(resp_buftype, rsp);
2616        kfree(iov);
2617        return rc;
2618}
2619
2620int
2621SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2622            u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2623{
2624        struct smb2_file_rename_info info;
2625        void **data;
2626        unsigned int size[2];
2627        int rc;
2628        int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2629
2630        data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2631        if (!data)
2632                return -ENOMEM;
2633
2634        info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2635                              /* 0 = fail if target already exists */
2636        info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2637        info.FileNameLength = cpu_to_le32(len);
2638
2639        data[0] = &info;
2640        size[0] = sizeof(struct smb2_file_rename_info);
2641
2642        data[1] = target_file;
2643        size[1] = len + 2 /* null */;
2644
2645        rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2646                           current->tgid, FILE_RENAME_INFORMATION, 2, data,
2647                           size);
2648        kfree(data);
2649        return rc;
2650}
2651
2652int
2653SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
2654                  u64 persistent_fid, u64 volatile_fid)
2655{
2656        __u8 delete_pending = 1;
2657        void *data;
2658        unsigned int size;
2659
2660        data = &delete_pending;
2661        size = 1; /* sizeof __u8 */
2662
2663        return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2664                        current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
2665                        &size);
2666}
2667
2668int
2669SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2670                  u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2671{
2672        struct smb2_file_link_info info;
2673        void **data;
2674        unsigned int size[2];
2675        int rc;
2676        int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2677
2678        data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2679        if (!data)
2680                return -ENOMEM;
2681
2682        info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2683                              /* 0 = fail if link already exists */
2684        info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2685        info.FileNameLength = cpu_to_le32(len);
2686
2687        data[0] = &info;
2688        size[0] = sizeof(struct smb2_file_link_info);
2689
2690        data[1] = target_file;
2691        size[1] = len + 2 /* null */;
2692
2693        rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2694                           current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2695        kfree(data);
2696        return rc;
2697}
2698
2699int
2700SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2701             u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2702{
2703        struct smb2_file_eof_info info;
2704        void *data;
2705        unsigned int size;
2706
2707        info.EndOfFile = *eof;
2708
2709        data = &info;
2710        size = sizeof(struct smb2_file_eof_info);
2711
2712        if (is_falloc)
2713                return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2714                        pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2715        else
2716                return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2717                        pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2718}
2719
2720int
2721SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2722              u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2723{
2724        unsigned int size;
2725        size = sizeof(FILE_BASIC_INFO);
2726        return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2727                             current->tgid, FILE_BASIC_INFORMATION, 1,
2728                             (void **)&buf, &size);
2729}
2730
2731int
2732SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2733                  const u64 persistent_fid, const u64 volatile_fid,
2734                  __u8 oplock_level)
2735{
2736        int rc;
2737        struct smb2_oplock_break *req = NULL;
2738
2739        cifs_dbg(FYI, "SMB2_oplock_break\n");
2740        rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2741
2742        if (rc)
2743                return rc;
2744
2745        req->VolatileFid = volatile_fid;
2746        req->PersistentFid = persistent_fid;
2747        req->OplockLevel = oplock_level;
2748        req->hdr.CreditRequest = cpu_to_le16(1);
2749
2750        rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2751        /* SMB2 buffer freed by function above */
2752
2753        if (rc) {
2754                cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2755                cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2756        }
2757
2758        return rc;
2759}
2760
2761static void
2762copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2763                        struct kstatfs *kst)
2764{
2765        kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2766                          le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2767        kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2768        kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2769        kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2770        return;
2771}
2772
2773static int
2774build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2775                   int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2776{
2777        int rc;
2778        struct smb2_query_info_req *req;
2779
2780        cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2781
2782        if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2783                return -EIO;
2784
2785        rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2786        if (rc)
2787                return rc;
2788
2789        req->InfoType = SMB2_O_INFO_FILESYSTEM;
2790        req->FileInfoClass = level;
2791        req->PersistentFileId = persistent_fid;
2792        req->VolatileFileId = volatile_fid;
2793        /* 4 for rfc1002 length field and 1 for pad */
2794        req->InputBufferOffset =
2795                        cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2796        req->OutputBufferLength = cpu_to_le32(
2797                outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2798
2799        iov->iov_base = (char *)req;
2800        /* 4 for rfc1002 length field */
2801        iov->iov_len = get_rfc1002_length(req) + 4;
2802        return 0;
2803}
2804
2805int
2806SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2807              u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2808{
2809        struct smb2_query_info_rsp *rsp = NULL;
2810        struct kvec iov;
2811        int rc = 0;
2812        int resp_buftype;
2813        struct cifs_ses *ses = tcon->ses;
2814        struct smb2_fs_full_size_info *info = NULL;
2815
2816        rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2817                                sizeof(struct smb2_fs_full_size_info),
2818                                persistent_fid, volatile_fid);
2819        if (rc)
2820                return rc;
2821
2822        rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2823        if (rc) {
2824                cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2825                goto qfsinf_exit;
2826        }
2827        rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2828
2829        info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2830                le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2831        rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2832                          le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2833                          sizeof(struct smb2_fs_full_size_info));
2834        if (!rc)
2835                copy_fs_info_to_kstatfs(info, fsdata);
2836
2837qfsinf_exit:
2838        free_rsp_buf(resp_buftype, iov.iov_base);
2839        return rc;
2840}
2841
2842int
2843SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2844              u64 persistent_fid, u64 volatile_fid, int level)
2845{
2846        struct smb2_query_info_rsp *rsp = NULL;
2847        struct kvec iov;
2848        int rc = 0;
2849        int resp_buftype, max_len, min_len;
2850        struct cifs_ses *ses = tcon->ses;
2851        unsigned int rsp_len, offset;
2852
2853        if (level == FS_DEVICE_INFORMATION) {
2854                max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2855                min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2856        } else if (level == FS_ATTRIBUTE_INFORMATION) {
2857                max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2858                min_len = MIN_FS_ATTR_INFO_SIZE;
2859        } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2860                max_len = sizeof(struct smb3_fs_ss_info);
2861                min_len = sizeof(struct smb3_fs_ss_info);
2862        } else {
2863                cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2864                return -EINVAL;
2865        }
2866
2867        rc = build_qfs_info_req(&iov, tcon, level, max_len,
2868                                persistent_fid, volatile_fid);
2869        if (rc)
2870                return rc;
2871
2872        rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2873        if (rc) {
2874                cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2875                goto qfsattr_exit;
2876        }
2877        rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2878
2879        rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2880        offset = le16_to_cpu(rsp->OutputBufferOffset);
2881        rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2882        if (rc)
2883                goto qfsattr_exit;
2884
2885        if (level == FS_ATTRIBUTE_INFORMATION)
2886                memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2887                        + (char *)&rsp->hdr, min_t(unsigned int,
2888                        rsp_len, max_len));
2889        else if (level == FS_DEVICE_INFORMATION)
2890                memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2891                        + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2892        else if (level == FS_SECTOR_SIZE_INFORMATION) {
2893                struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2894                        (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2895                tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2896                tcon->perf_sector_size =
2897                        le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2898        }
2899
2900qfsattr_exit:
2901        free_rsp_buf(resp_buftype, iov.iov_base);
2902        return rc;
2903}
2904
2905int
2906smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2907           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2908           const __u32 num_lock, struct smb2_lock_element *buf)
2909{
2910        int rc = 0;
2911        struct smb2_lock_req *req = NULL;
2912        struct kvec iov[2];
2913        int resp_buf_type;
2914        unsigned int count;
2915
2916        cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2917
2918        rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2919        if (rc)
2920                return rc;
2921
2922        req->hdr.ProcessId = cpu_to_le32(pid);
2923        req->LockCount = cpu_to_le16(num_lock);
2924
2925        req->PersistentFileId = persist_fid;
2926        req->VolatileFileId = volatile_fid;
2927
2928        count = num_lock * sizeof(struct smb2_lock_element);
2929        inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2930
2931        iov[0].iov_base = (char *)req;
2932        /* 4 for rfc1002 length field and count for all locks */
2933        iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2934        iov[1].iov_base = (char *)buf;
2935        iov[1].iov_len = count;
2936
2937        cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2938        rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2939        if (rc) {
2940                cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2941                cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2942        }
2943
2944        return rc;
2945}
2946
2947int
2948SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2949          const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2950          const __u64 length, const __u64 offset, const __u32 lock_flags,
2951          const bool wait)
2952{
2953        struct smb2_lock_element lock;
2954
2955        lock.Offset = cpu_to_le64(offset);
2956        lock.Length = cpu_to_le64(length);
2957        lock.Flags = cpu_to_le32(lock_flags);
2958        if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2959                lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2960
2961        return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2962}
2963
2964int
2965SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2966                 __u8 *lease_key, const __le32 lease_state)
2967{
2968        int rc;
2969        struct smb2_lease_ack *req = NULL;
2970
2971        cifs_dbg(FYI, "SMB2_lease_break\n");
2972        rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2973
2974        if (rc)
2975                return rc;
2976
2977        req->hdr.CreditRequest = cpu_to_le16(1);
2978        req->StructureSize = cpu_to_le16(36);
2979        inc_rfc1001_len(req, 12);
2980
2981        memcpy(req->LeaseKey, lease_key, 16);
2982        req->LeaseState = lease_state;
2983
2984        rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2985        /* SMB2 buffer freed by function above */
2986
2987        if (rc) {
2988                cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2989                cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2990        }
2991
2992        return rc;
2993}
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