source: src/linux/universal/linux-4.9/fs/cifs/smb2pdu.c @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 5 weeks ago

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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 = SMB2_PROTO_NUMBER;
101        hdr->StructureSize = cpu_to_le16(64);
102        hdr->Command = smb2_cmd;
103        if (tcon && tcon->ses && tcon->ses->server) {
104                struct TCP_Server_Info *server = tcon->ses->server;
105
106                spin_lock(&server->req_lock);
107                /* Request up to 2 credits but don't go over the limit. */
108                if (server->credits >= server->max_credits)
109                        hdr->CreditRequest = cpu_to_le16(0);
110                else
111                        hdr->CreditRequest = cpu_to_le16(
112                                min_t(int, server->max_credits -
113                                                server->credits, 2));
114                spin_unlock(&server->req_lock);
115        } else {
116                hdr->CreditRequest = cpu_to_le16(2);
117        }
118        hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
119
120        if (!tcon)
121                goto out;
122
123        /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
124        /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
125        if ((tcon->ses) && (tcon->ses->server) &&
126            (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
127                hdr->CreditCharge = cpu_to_le16(1);
128        /* else CreditCharge MBZ */
129
130        hdr->TreeId = tcon->tid;
131        /* Uid is not converted */
132        if (tcon->ses)
133                hdr->SessionId = tcon->ses->Suid;
134
135        /*
136         * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
137         * to pass the path on the Open SMB prefixed by \\server\share.
138         * Not sure when we would need to do the augmented path (if ever) and
139         * setting this flag breaks the SMB2 open operation since it is
140         * illegal to send an empty path name (without \\server\share prefix)
141         * when the DFS flag is set in the SMB open header. We could
142         * consider setting the flag on all operations other than open
143         * but it is safer to net set it for now.
144         */
145/*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
146                hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
147
148        if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
149                hdr->Flags |= SMB2_FLAGS_SIGNED;
150out:
151        pdu->StructureSize2 = cpu_to_le16(parmsize);
152        return;
153}
154
155static int
156smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
157{
158        int rc = 0;
159        struct nls_table *nls_codepage;
160        struct cifs_ses *ses;
161        struct TCP_Server_Info *server;
162
163        /*
164         * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
165         * check for tcp and smb session status done differently
166         * for those three - in the calling routine.
167         */
168        if (tcon == NULL)
169                return rc;
170
171        if (smb2_command == SMB2_TREE_CONNECT)
172                return rc;
173
174        if (tcon->tidStatus == CifsExiting) {
175                /*
176                 * only tree disconnect, open, and write,
177                 * (and ulogoff which does not have tcon)
178                 * are allowed as we start force umount.
179                 */
180                if ((smb2_command != SMB2_WRITE) &&
181                   (smb2_command != SMB2_CREATE) &&
182                   (smb2_command != SMB2_TREE_DISCONNECT)) {
183                        cifs_dbg(FYI, "can not send cmd %d while umounting\n",
184                                 smb2_command);
185                        return -ENODEV;
186                }
187        }
188        if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
189            (!tcon->ses->server))
190                return -EIO;
191
192        ses = tcon->ses;
193        server = ses->server;
194
195        /*
196         * Give demultiplex thread up to 10 seconds to reconnect, should be
197         * greater than cifs socket timeout which is 7 seconds
198         */
199        while (server->tcpStatus == CifsNeedReconnect) {
200                /*
201                 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
202                 * here since they are implicitly done when session drops.
203                 */
204                switch (smb2_command) {
205                /*
206                 * BB Should we keep oplock break and add flush to exceptions?
207                 */
208                case SMB2_TREE_DISCONNECT:
209                case SMB2_CANCEL:
210                case SMB2_CLOSE:
211                case SMB2_OPLOCK_BREAK:
212                        return -EAGAIN;
213                }
214
215                wait_event_interruptible_timeout(server->response_q,
216                        (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
217
218                /* are we still trying to reconnect? */
219                if (server->tcpStatus != CifsNeedReconnect)
220                        break;
221
222                /*
223                 * on "soft" mounts we wait once. Hard mounts keep
224                 * retrying until process is killed or server comes
225                 * back on-line
226                 */
227                if (!tcon->retry) {
228                        cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
229                        return -EHOSTDOWN;
230                }
231        }
232
233        if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
234                return rc;
235
236        nls_codepage = load_nls_default();
237
238        /*
239         * need to prevent multiple threads trying to simultaneously reconnect
240         * the same SMB session
241         */
242        mutex_lock(&tcon->ses->session_mutex);
243        rc = cifs_negotiate_protocol(0, tcon->ses);
244        if (!rc && tcon->ses->need_reconnect)
245                rc = cifs_setup_session(0, tcon->ses, nls_codepage);
246
247        if (rc || !tcon->need_reconnect) {
248                mutex_unlock(&tcon->ses->session_mutex);
249                goto out;
250        }
251
252        cifs_mark_open_files_invalid(tcon);
253        if (tcon->use_persistent)
254                tcon->need_reopen_files = true;
255
256        rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
257        mutex_unlock(&tcon->ses->session_mutex);
258
259        cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
260        if (rc)
261                goto out;
262
263        if (smb2_command != SMB2_INTERNAL_CMD)
264                queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
265
266        atomic_inc(&tconInfoReconnectCount);
267out:
268        /*
269         * Check if handle based operation so we know whether we can continue
270         * or not without returning to caller to reset file handle.
271         */
272        /*
273         * BB Is flush done by server on drop of tcp session? Should we special
274         * case it and skip above?
275         */
276        switch (smb2_command) {
277        case SMB2_FLUSH:
278        case SMB2_READ:
279        case SMB2_WRITE:
280        case SMB2_LOCK:
281        case SMB2_IOCTL:
282        case SMB2_QUERY_DIRECTORY:
283        case SMB2_CHANGE_NOTIFY:
284        case SMB2_QUERY_INFO:
285        case SMB2_SET_INFO:
286                rc = -EAGAIN;
287        }
288        unload_nls(nls_codepage);
289        return rc;
290}
291
292/*
293 * Allocate and return pointer to an SMB request hdr, and set basic
294 * SMB information in the SMB header. If the return code is zero, this
295 * function must have filled in request_buf pointer.
296 */
297static int
298small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
299                void **request_buf)
300{
301        int rc = 0;
302
303        rc = smb2_reconnect(smb2_command, tcon);
304        if (rc)
305                return rc;
306
307        /* BB eventually switch this to SMB2 specific small buf size */
308        *request_buf = cifs_small_buf_get();
309        if (*request_buf == NULL) {
310                /* BB should we add a retry in here if not a writepage? */
311                return -ENOMEM;
312        }
313
314        smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
315
316        if (tcon != NULL) {
317#ifdef CONFIG_CIFS_STATS2
318                uint16_t com_code = le16_to_cpu(smb2_command);
319                cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
320#endif
321                cifs_stats_inc(&tcon->num_smbs_sent);
322        }
323
324        return rc;
325}
326
327#ifdef CONFIG_CIFS_SMB311
328/* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
329#define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
330
331
332#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
333#define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
334
335static void
336build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
337{
338        pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
339        pneg_ctxt->DataLength = cpu_to_le16(38);
340        pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
341        pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
342        get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
343        pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
344}
345
346static void
347build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
348{
349        pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
350        pneg_ctxt->DataLength = cpu_to_le16(6);
351        pneg_ctxt->CipherCount = cpu_to_le16(2);
352        pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
353        pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
354}
355
356static void
357assemble_neg_contexts(struct smb2_negotiate_req *req)
358{
359
360        /* +4 is to account for the RFC1001 len field */
361        char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
362
363        build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
364        /* Add 2 to size to round to 8 byte boundary */
365        pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
366        build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
367        req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
368        req->NegotiateContextCount = cpu_to_le16(2);
369        inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
370                        + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
371}
372#else
373static void assemble_neg_contexts(struct smb2_negotiate_req *req)
374{
375        return;
376}
377#endif /* SMB311 */
378
379
380/*
381 *
382 *      SMB2 Worker functions follow:
383 *
384 *      The general structure of the worker functions is:
385 *      1) Call smb2_init (assembles SMB2 header)
386 *      2) Initialize SMB2 command specific fields in fixed length area of SMB
387 *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
388 *      4) Decode SMB2 command specific fields in the fixed length area
389 *      5) Decode variable length data area (if any for this SMB2 command type)
390 *      6) Call free smb buffer
391 *      7) return
392 *
393 */
394
395int
396SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
397{
398        struct smb2_negotiate_req *req;
399        struct smb2_negotiate_rsp *rsp;
400        struct kvec iov[1];
401        int rc = 0;
402        int resp_buftype;
403        struct TCP_Server_Info *server = ses->server;
404        int blob_offset, blob_length;
405        char *security_blob;
406        int flags = CIFS_NEG_OP;
407
408        cifs_dbg(FYI, "Negotiate protocol\n");
409
410        if (!server) {
411                WARN(1, "%s: server is NULL!\n", __func__);
412                return -EIO;
413        }
414
415        rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
416        if (rc)
417                return rc;
418
419        req->hdr.SessionId = 0;
420
421        req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
422
423        req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
424        inc_rfc1001_len(req, 2);
425
426        /* only one of SMB2 signing flags may be set in SMB2 request */
427        if (ses->sign)
428                req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
429        else if (global_secflags & CIFSSEC_MAY_SIGN)
430                req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
431        else
432                req->SecurityMode = 0;
433
434        req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
435
436        /* ClientGUID must be zero for SMB2.02 dialect */
437        if (ses->server->vals->protocol_id == SMB20_PROT_ID)
438                memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
439        else {
440                memcpy(req->ClientGUID, server->client_guid,
441                        SMB2_CLIENT_GUID_SIZE);
442                if (ses->server->vals->protocol_id == SMB311_PROT_ID)
443                        assemble_neg_contexts(req);
444        }
445        iov[0].iov_base = (char *)req;
446        /* 4 for rfc1002 length field */
447        iov[0].iov_len = get_rfc1002_length(req) + 4;
448
449        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
450
451        rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
452        /*
453         * No tcon so can't do
454         * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
455         */
456        if (rc != 0)
457                goto neg_exit;
458
459        cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
460
461        /* BB we may eventually want to match the negotiated vs. requested
462           dialect, even though we are only requesting one at a time */
463        if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
464                cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
465        else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
466                cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
467        else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
468                cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
469        else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
470                cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
471#ifdef CONFIG_CIFS_SMB311
472        else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
473                cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
474#endif /* SMB311 */
475        else {
476                cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
477                         le16_to_cpu(rsp->DialectRevision));
478                rc = -EIO;
479                goto neg_exit;
480        }
481        server->dialect = le16_to_cpu(rsp->DialectRevision);
482
483        /* SMB2 only has an extended negflavor */
484        server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
485        /* set it to the maximum buffer size value we can send with 1 credit */
486        server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
487                               SMB2_MAX_BUFFER_SIZE);
488        server->max_read = le32_to_cpu(rsp->MaxReadSize);
489        server->max_write = le32_to_cpu(rsp->MaxWriteSize);
490        /* BB Do we need to validate the SecurityMode? */
491        server->sec_mode = le16_to_cpu(rsp->SecurityMode);
492        server->capabilities = le32_to_cpu(rsp->Capabilities);
493        /* Internal types */
494        server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
495
496        security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
497                                               &rsp->hdr);
498        /*
499         * See MS-SMB2 section 2.2.4: if no blob, client picks default which
500         * for us will be
501         *      ses->sectype = RawNTLMSSP;
502         * but for time being this is our only auth choice so doesn't matter.
503         * We just found a server which sets blob length to zero expecting raw.
504         */
505        if (blob_length == 0)
506                cifs_dbg(FYI, "missing security blob on negprot\n");
507
508        rc = cifs_enable_signing(server, ses->sign);
509        if (rc)
510                goto neg_exit;
511        if (blob_length) {
512                rc = decode_negTokenInit(security_blob, blob_length, server);
513                if (rc == 1)
514                        rc = 0;
515                else if (rc == 0)
516                        rc = -EIO;
517        }
518neg_exit:
519        free_rsp_buf(resp_buftype, rsp);
520        return rc;
521}
522
523int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
524{
525        int rc = 0;
526        struct validate_negotiate_info_req vneg_inbuf;
527        struct validate_negotiate_info_rsp *pneg_rsp;
528        u32 rsplen;
529
530        cifs_dbg(FYI, "validate negotiate\n");
531
532        /*
533         * validation ioctl must be signed, so no point sending this if we
534         * can not sign it.  We could eventually change this to selectively
535         * sign just this, the first and only signed request on a connection.
536         * This is good enough for now since a user who wants better security
537         * would also enable signing on the mount. Having validation of
538         * negotiate info for signed connections helps reduce attack vectors
539         */
540        if (tcon->ses->server->sign == false)
541                return 0; /* validation requires signing */
542
543        vneg_inbuf.Capabilities =
544                        cpu_to_le32(tcon->ses->server->vals->req_capabilities);
545        memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
546                                        SMB2_CLIENT_GUID_SIZE);
547
548        if (tcon->ses->sign)
549                vneg_inbuf.SecurityMode =
550                        cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
551        else if (global_secflags & CIFSSEC_MAY_SIGN)
552                vneg_inbuf.SecurityMode =
553                        cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
554        else
555                vneg_inbuf.SecurityMode = 0;
556
557        vneg_inbuf.DialectCount = cpu_to_le16(1);
558        vneg_inbuf.Dialects[0] =
559                cpu_to_le16(tcon->ses->server->vals->protocol_id);
560
561        rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
562                FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
563                (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
564                (char **)&pneg_rsp, &rsplen);
565
566        if (rc != 0) {
567                cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
568                return -EIO;
569        }
570
571        if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
572                cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
573                return -EIO;
574        }
575
576        /* check validate negotiate info response matches what we got earlier */
577        if (pneg_rsp->Dialect !=
578                        cpu_to_le16(tcon->ses->server->vals->protocol_id))
579                goto vneg_out;
580
581        if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
582                goto vneg_out;
583
584        /* do not validate server guid because not saved at negprot time yet */
585
586        if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
587              SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
588                goto vneg_out;
589
590        /* validate negotiate successful */
591        cifs_dbg(FYI, "validate negotiate info successful\n");
592        return 0;
593
594vneg_out:
595        cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
596        return -EIO;
597}
598
599struct SMB2_sess_data {
600        unsigned int xid;
601        struct cifs_ses *ses;
602        struct nls_table *nls_cp;
603        void (*func)(struct SMB2_sess_data *);
604        int result;
605        u64 previous_session;
606
607        /* we will send the SMB in three pieces:
608         * a fixed length beginning part, an optional
609         * SPNEGO blob (which can be zero length), and a
610         * last part which will include the strings
611         * and rest of bcc area. This allows us to avoid
612         * a large buffer 17K allocation
613         */
614        int buf0_type;
615        struct kvec iov[2];
616};
617
618static int
619SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
620{
621        int rc;
622        struct cifs_ses *ses = sess_data->ses;
623        struct smb2_sess_setup_req *req;
624        struct TCP_Server_Info *server = ses->server;
625
626        rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
627        if (rc)
628                return rc;
629
630        req->hdr.SessionId = 0; /* First session, not a reauthenticate */
631
632        /* if reconnect, we need to send previous sess id, otherwise it is 0 */
633        req->PreviousSessionId = sess_data->previous_session;
634
635        req->Flags = 0; /* MBZ */
636        /* to enable echos and oplocks */
637        req->hdr.CreditRequest = cpu_to_le16(3);
638
639        /* only one of SMB2 signing flags may be set in SMB2 request */
640        if (server->sign)
641                req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
642        else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
643                req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
644        else
645                req->SecurityMode = 0;
646
647        req->Capabilities = 0;
648        req->Channel = 0; /* MBZ */
649
650        sess_data->iov[0].iov_base = (char *)req;
651        /* 4 for rfc1002 length field and 1 for pad */
652        sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
653        /*
654         * This variable will be used to clear the buffer
655         * allocated above in case of any error in the calling function.
656         */
657        sess_data->buf0_type = CIFS_SMALL_BUFFER;
658
659        return 0;
660}
661
662static void
663SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
664{
665        free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
666        sess_data->buf0_type = CIFS_NO_BUFFER;
667}
668
669static int
670SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
671{
672        int rc;
673        struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
674
675        /* Testing shows that buffer offset must be at location of Buffer[0] */
676        req->SecurityBufferOffset =
677                cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
678                        1 /* pad */ - 4 /* rfc1001 len */);
679        req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
680
681        inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
682
683        /* BB add code to build os and lm fields */
684
685        rc = SendReceive2(sess_data->xid, sess_data->ses,
686                                sess_data->iov, 2,
687                                &sess_data->buf0_type,
688                                CIFS_LOG_ERROR | CIFS_NEG_OP);
689
690        return rc;
691}
692
693static int
694SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
695{
696        int rc = 0;
697        struct cifs_ses *ses = sess_data->ses;
698
699        mutex_lock(&ses->server->srv_mutex);
700        if (ses->server->sign && ses->server->ops->generate_signingkey) {
701                rc = ses->server->ops->generate_signingkey(ses);
702                kfree(ses->auth_key.response);
703                ses->auth_key.response = NULL;
704                if (rc) {
705                        cifs_dbg(FYI,
706                                "SMB3 session key generation failed\n");
707                        mutex_unlock(&ses->server->srv_mutex);
708                        goto keygen_exit;
709                }
710        }
711        if (!ses->server->session_estab) {
712                ses->server->sequence_number = 0x2;
713                ses->server->session_estab = true;
714        }
715        mutex_unlock(&ses->server->srv_mutex);
716
717        cifs_dbg(FYI, "SMB2/3 session established successfully\n");
718        spin_lock(&GlobalMid_Lock);
719        ses->status = CifsGood;
720        ses->need_reconnect = false;
721        spin_unlock(&GlobalMid_Lock);
722
723keygen_exit:
724        if (!ses->server->sign) {
725                kfree(ses->auth_key.response);
726                ses->auth_key.response = NULL;
727        }
728        return rc;
729}
730
731#ifdef CONFIG_CIFS_UPCALL
732static void
733SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
734{
735        int rc;
736        struct cifs_ses *ses = sess_data->ses;
737        struct cifs_spnego_msg *msg;
738        struct key *spnego_key = NULL;
739        struct smb2_sess_setup_rsp *rsp = NULL;
740
741        rc = SMB2_sess_alloc_buffer(sess_data);
742        if (rc)
743                goto out;
744
745        spnego_key = cifs_get_spnego_key(ses);
746        if (IS_ERR(spnego_key)) {
747                rc = PTR_ERR(spnego_key);
748                spnego_key = NULL;
749                goto out;
750        }
751
752        msg = spnego_key->payload.data[0];
753        /*
754         * check version field to make sure that cifs.upcall is
755         * sending us a response in an expected form
756         */
757        if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
758                cifs_dbg(VFS,
759                          "bad cifs.upcall version. Expected %d got %d",
760                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
761                rc = -EKEYREJECTED;
762                goto out_put_spnego_key;
763        }
764
765        ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
766                                         GFP_KERNEL);
767        if (!ses->auth_key.response) {
768                cifs_dbg(VFS,
769                        "Kerberos can't allocate (%u bytes) memory",
770                        msg->sesskey_len);
771                rc = -ENOMEM;
772                goto out_put_spnego_key;
773        }
774        ses->auth_key.len = msg->sesskey_len;
775
776        sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
777        sess_data->iov[1].iov_len = msg->secblob_len;
778
779        rc = SMB2_sess_sendreceive(sess_data);
780        if (rc)
781                goto out_put_spnego_key;
782
783        rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
784        ses->Suid = rsp->hdr.SessionId;
785
786        ses->session_flags = le16_to_cpu(rsp->SessionFlags);
787        if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
788                cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
789
790        rc = SMB2_sess_establish_session(sess_data);
791out_put_spnego_key:
792        key_invalidate(spnego_key);
793        key_put(spnego_key);
794out:
795        sess_data->result = rc;
796        sess_data->func = NULL;
797        SMB2_sess_free_buffer(sess_data);
798}
799#else
800static void
801SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
802{
803        cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
804        sess_data->result = -EOPNOTSUPP;
805        sess_data->func = NULL;
806}
807#endif
808
809static void
810SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
811
812static void
813SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
814{
815        int rc;
816        struct cifs_ses *ses = sess_data->ses;
817        struct smb2_sess_setup_rsp *rsp = NULL;
818        char *ntlmssp_blob = NULL;
819        bool use_spnego = false; /* else use raw ntlmssp */
820        u16 blob_length = 0;
821
822        /*
823         * If memory allocation is successful, caller of this function
824         * frees it.
825         */
826        ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
827        if (!ses->ntlmssp) {
828                rc = -ENOMEM;
829                goto out_err;
830        }
831        ses->ntlmssp->sesskey_per_smbsess = true;
832
833        rc = SMB2_sess_alloc_buffer(sess_data);
834        if (rc)
835                goto out_err;
836
837        ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
838                               GFP_KERNEL);
839        if (ntlmssp_blob == NULL) {
840                rc = -ENOMEM;
841                goto out;
842        }
843
844        build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
845        if (use_spnego) {
846                /* BB eventually need to add this */
847                cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
848                rc = -EOPNOTSUPP;
849                goto out;
850        } else {
851                blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
852                /* with raw NTLMSSP we don't encapsulate in SPNEGO */
853        }
854        sess_data->iov[1].iov_base = ntlmssp_blob;
855        sess_data->iov[1].iov_len = blob_length;
856
857        rc = SMB2_sess_sendreceive(sess_data);
858        rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
859
860        /* If true, rc here is expected and not an error */
861        if (sess_data->buf0_type != CIFS_NO_BUFFER &&
862                rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
863                rc = 0;
864
865        if (rc)
866                goto out;
867
868        if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
869                        le16_to_cpu(rsp->SecurityBufferOffset)) {
870                cifs_dbg(VFS, "Invalid security buffer offset %d\n",
871                        le16_to_cpu(rsp->SecurityBufferOffset));
872                rc = -EIO;
873                goto out;
874        }
875        rc = decode_ntlmssp_challenge(rsp->Buffer,
876                        le16_to_cpu(rsp->SecurityBufferLength), ses);
877        if (rc)
878                goto out;
879
880        cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
881
882
883        ses->Suid = rsp->hdr.SessionId;
884        ses->session_flags = le16_to_cpu(rsp->SessionFlags);
885        if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
886                cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
887
888out:
889        kfree(ntlmssp_blob);
890        SMB2_sess_free_buffer(sess_data);
891        if (!rc) {
892                sess_data->result = 0;
893                sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
894                return;
895        }
896out_err:
897        kfree(ses->ntlmssp);
898        ses->ntlmssp = NULL;
899        sess_data->result = rc;
900        sess_data->func = NULL;
901}
902
903static void
904SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
905{
906        int rc;
907        struct cifs_ses *ses = sess_data->ses;
908        struct smb2_sess_setup_req *req;
909        struct smb2_sess_setup_rsp *rsp = NULL;
910        unsigned char *ntlmssp_blob = NULL;
911        bool use_spnego = false; /* else use raw ntlmssp */
912        u16 blob_length = 0;
913
914        rc = SMB2_sess_alloc_buffer(sess_data);
915        if (rc)
916                goto out;
917
918        req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
919        req->hdr.SessionId = ses->Suid;
920
921        rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
922                                        sess_data->nls_cp);
923        if (rc) {
924                cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
925                goto out;
926        }
927
928        if (use_spnego) {
929                /* BB eventually need to add this */
930                cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
931                rc = -EOPNOTSUPP;
932                goto out;
933        }
934        sess_data->iov[1].iov_base = ntlmssp_blob;
935        sess_data->iov[1].iov_len = blob_length;
936
937        rc = SMB2_sess_sendreceive(sess_data);
938        if (rc)
939                goto out;
940
941        rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
942
943        ses->Suid = rsp->hdr.SessionId;
944        ses->session_flags = le16_to_cpu(rsp->SessionFlags);
945        if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
946                cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
947
948        rc = SMB2_sess_establish_session(sess_data);
949out:
950        kfree(ntlmssp_blob);
951        SMB2_sess_free_buffer(sess_data);
952        kfree(ses->ntlmssp);
953        ses->ntlmssp = NULL;
954        sess_data->result = rc;
955        sess_data->func = NULL;
956}
957
958static int
959SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
960{
961        if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
962                ses->sectype = RawNTLMSSP;
963
964        switch (ses->sectype) {
965        case Kerberos:
966                sess_data->func = SMB2_auth_kerberos;
967                break;
968        case RawNTLMSSP:
969                sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
970                break;
971        default:
972                cifs_dbg(VFS, "secType %d not supported!\n", ses->sectype);
973                return -EOPNOTSUPP;
974        }
975
976        return 0;
977}
978
979int
980SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
981                const struct nls_table *nls_cp)
982{
983        int rc = 0;
984        struct TCP_Server_Info *server = ses->server;
985        struct SMB2_sess_data *sess_data;
986
987        cifs_dbg(FYI, "Session Setup\n");
988
989        if (!server) {
990                WARN(1, "%s: server is NULL!\n", __func__);
991                return -EIO;
992        }
993
994        sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
995        if (!sess_data)
996                return -ENOMEM;
997
998        rc = SMB2_select_sec(ses, sess_data);
999        if (rc)
1000                goto out;
1001        sess_data->xid = xid;
1002        sess_data->ses = ses;
1003        sess_data->buf0_type = CIFS_NO_BUFFER;
1004        sess_data->nls_cp = (struct nls_table *) nls_cp;
1005
1006        while (sess_data->func)
1007                sess_data->func(sess_data);
1008
1009        rc = sess_data->result;
1010out:
1011        kfree(sess_data);
1012        return rc;
1013}
1014
1015int
1016SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1017{
1018        struct smb2_logoff_req *req; /* response is also trivial struct */
1019        int rc = 0;
1020        struct TCP_Server_Info *server;
1021
1022        cifs_dbg(FYI, "disconnect session %p\n", ses);
1023
1024        if (ses && (ses->server))
1025                server = ses->server;
1026        else
1027                return -EIO;
1028
1029        /* no need to send SMB logoff if uid already closed due to reconnect */
1030        if (ses->need_reconnect)
1031                goto smb2_session_already_dead;
1032
1033        rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1034        if (rc)
1035                return rc;
1036
1037         /* since no tcon, smb2_init can not do this, so do here */
1038        req->hdr.SessionId = ses->Suid;
1039        if (server->sign)
1040                req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1041
1042        rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
1043        /*
1044         * No tcon so can't do
1045         * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1046         */
1047
1048smb2_session_already_dead:
1049        return rc;
1050}
1051
1052static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1053{
1054        cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1055}
1056
1057#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1058
1059/* These are similar values to what Windows uses */
1060static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1061{
1062        tcon->max_chunks = 256;
1063        tcon->max_bytes_chunk = 1048576;
1064        tcon->max_bytes_copy = 16777216;
1065}
1066
1067int
1068SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1069          struct cifs_tcon *tcon, const struct nls_table *cp)
1070{
1071        struct smb2_tree_connect_req *req;
1072        struct smb2_tree_connect_rsp *rsp = NULL;
1073        struct kvec iov[2];
1074        int rc = 0;
1075        int resp_buftype;
1076        int unc_path_len;
1077        struct TCP_Server_Info *server;
1078        __le16 *unc_path = NULL;
1079
1080        cifs_dbg(FYI, "TCON\n");
1081
1082        if ((ses->server) && tree)
1083                server = ses->server;
1084        else
1085                return -EIO;
1086
1087        if (tcon && tcon->bad_network_name)
1088                return -ENOENT;
1089
1090        if ((tcon && tcon->seal) &&
1091            ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
1092                cifs_dbg(VFS, "encryption requested but no server support");
1093                return -EOPNOTSUPP;
1094        }
1095
1096        unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1097        if (unc_path == NULL)
1098                return -ENOMEM;
1099
1100        unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1101        unc_path_len *= 2;
1102        if (unc_path_len < 2) {
1103                kfree(unc_path);
1104                return -EINVAL;
1105        }
1106
1107        /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1108        if (tcon)
1109                tcon->tid = 0;
1110
1111        rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1112        if (rc) {
1113                kfree(unc_path);
1114                return rc;
1115        }
1116
1117        if (tcon == NULL) {
1118                /* since no tcon, smb2_init can not do this, so do here */
1119                req->hdr.SessionId = ses->Suid;
1120                /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
1121                        req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
1122        }
1123
1124        iov[0].iov_base = (char *)req;
1125        /* 4 for rfc1002 length field and 1 for pad */
1126        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1127
1128        /* Testing shows that buffer offset must be at location of Buffer[0] */
1129        req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1130                        - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1131        req->PathLength = cpu_to_le16(unc_path_len - 2);
1132        iov[1].iov_base = unc_path;
1133        iov[1].iov_len = unc_path_len;
1134
1135        inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1136
1137        rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1138        rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
1139
1140        if (rc != 0) {
1141                if (tcon) {
1142                        cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1143                        tcon->need_reconnect = true;
1144                }
1145                goto tcon_error_exit;
1146        }
1147
1148        if (tcon == NULL) {
1149                ses->ipc_tid = rsp->hdr.TreeId;
1150                goto tcon_exit;
1151        }
1152
1153        if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
1154                cifs_dbg(FYI, "connection to disk share\n");
1155        else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
1156                tcon->ipc = true;
1157                cifs_dbg(FYI, "connection to pipe share\n");
1158        } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
1159                tcon->print = true;
1160                cifs_dbg(FYI, "connection to printer\n");
1161        } else {
1162                cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1163                rc = -EOPNOTSUPP;
1164                goto tcon_error_exit;
1165        }
1166
1167        tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1168        tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1169        tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1170        tcon->tidStatus = CifsGood;
1171        tcon->need_reconnect = false;
1172        tcon->tid = rsp->hdr.TreeId;
1173        strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1174
1175        if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1176            ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1177                cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1178        init_copy_chunk_defaults(tcon);
1179        if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1180                cifs_dbg(VFS, "Encrypted shares not supported");
1181        if (tcon->ses->server->ops->validate_negotiate)
1182                rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1183tcon_exit:
1184        free_rsp_buf(resp_buftype, rsp);
1185        kfree(unc_path);
1186        return rc;
1187
1188tcon_error_exit:
1189        if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1190                cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1191                if (tcon)
1192                        tcon->bad_network_name = true;
1193        }
1194        goto tcon_exit;
1195}
1196
1197int
1198SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1199{
1200        struct smb2_tree_disconnect_req *req; /* response is trivial */
1201        int rc = 0;
1202        struct TCP_Server_Info *server;
1203        struct cifs_ses *ses = tcon->ses;
1204
1205        cifs_dbg(FYI, "Tree Disconnect\n");
1206
1207        if (ses && (ses->server))
1208                server = ses->server;
1209        else
1210                return -EIO;
1211
1212        if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1213                return 0;
1214
1215        rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1216        if (rc)
1217                return rc;
1218
1219        rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1220        if (rc)
1221                cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1222
1223        return rc;
1224}
1225
1226
1227static struct create_durable *
1228create_durable_buf(void)
1229{
1230        struct create_durable *buf;
1231
1232        buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1233        if (!buf)
1234                return NULL;
1235
1236        buf->ccontext.DataOffset = cpu_to_le16(offsetof
1237                                        (struct create_durable, Data));
1238        buf->ccontext.DataLength = cpu_to_le32(16);
1239        buf->ccontext.NameOffset = cpu_to_le16(offsetof
1240                                (struct create_durable, Name));
1241        buf->ccontext.NameLength = cpu_to_le16(4);
1242        /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1243        buf->Name[0] = 'D';
1244        buf->Name[1] = 'H';
1245        buf->Name[2] = 'n';
1246        buf->Name[3] = 'Q';
1247        return buf;
1248}
1249
1250static struct create_durable *
1251create_reconnect_durable_buf(struct cifs_fid *fid)
1252{
1253        struct create_durable *buf;
1254
1255        buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1256        if (!buf)
1257                return NULL;
1258
1259        buf->ccontext.DataOffset = cpu_to_le16(offsetof
1260                                        (struct create_durable, Data));
1261        buf->ccontext.DataLength = cpu_to_le32(16);
1262        buf->ccontext.NameOffset = cpu_to_le16(offsetof
1263                                (struct create_durable, Name));
1264        buf->ccontext.NameLength = cpu_to_le16(4);
1265        buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1266        buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1267        /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1268        buf->Name[0] = 'D';
1269        buf->Name[1] = 'H';
1270        buf->Name[2] = 'n';
1271        buf->Name[3] = 'C';
1272        return buf;
1273}
1274
1275static __u8
1276parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1277                  unsigned int *epoch)
1278{
1279        char *data_offset;
1280        struct create_context *cc;
1281        unsigned int next;
1282        unsigned int remaining;
1283        char *name;
1284
1285        data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1286        remaining = le32_to_cpu(rsp->CreateContextsLength);
1287        cc = (struct create_context *)data_offset;
1288        while (remaining >= sizeof(struct create_context)) {
1289                name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1290                if (le16_to_cpu(cc->NameLength) == 4 &&
1291                    strncmp(name, "RqLs", 4) == 0)
1292                        return server->ops->parse_lease_buf(cc, epoch);
1293
1294                next = le32_to_cpu(cc->Next);
1295                if (!next)
1296                        break;
1297                remaining -= next;
1298                cc = (struct create_context *)((char *)cc + next);
1299        }
1300
1301        return 0;
1302}
1303
1304static int
1305add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1306                  unsigned int *num_iovec, __u8 *oplock)
1307{
1308        struct smb2_create_req *req = iov[0].iov_base;
1309        unsigned int num = *num_iovec;
1310
1311        iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1312        if (iov[num].iov_base == NULL)
1313                return -ENOMEM;
1314        iov[num].iov_len = server->vals->create_lease_size;
1315        req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1316        if (!req->CreateContextsOffset)
1317                req->CreateContextsOffset = cpu_to_le32(
1318                                sizeof(struct smb2_create_req) - 4 +
1319                                iov[num - 1].iov_len);
1320        le32_add_cpu(&req->CreateContextsLength,
1321                     server->vals->create_lease_size);
1322        inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1323        *num_iovec = num + 1;
1324        return 0;
1325}
1326
1327static struct create_durable_v2 *
1328create_durable_v2_buf(struct cifs_fid *pfid)
1329{
1330        struct create_durable_v2 *buf;
1331
1332        buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1333        if (!buf)
1334                return NULL;
1335
1336        buf->ccontext.DataOffset = cpu_to_le16(offsetof
1337                                        (struct create_durable_v2, dcontext));
1338        buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1339        buf->ccontext.NameOffset = cpu_to_le16(offsetof
1340                                (struct create_durable_v2, Name));
1341        buf->ccontext.NameLength = cpu_to_le16(4);
1342
1343        buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1344        buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1345        generate_random_uuid(buf->dcontext.CreateGuid);
1346        memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1347
1348        /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1349        buf->Name[0] = 'D';
1350        buf->Name[1] = 'H';
1351        buf->Name[2] = '2';
1352        buf->Name[3] = 'Q';
1353        return buf;
1354}
1355
1356static struct create_durable_handle_reconnect_v2 *
1357create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1358{
1359        struct create_durable_handle_reconnect_v2 *buf;
1360
1361        buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1362                        GFP_KERNEL);
1363        if (!buf)
1364                return NULL;
1365
1366        buf->ccontext.DataOffset =
1367                cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1368                                     dcontext));
1369        buf->ccontext.DataLength =
1370                cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1371        buf->ccontext.NameOffset =
1372                cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1373                            Name));
1374        buf->ccontext.NameLength = cpu_to_le16(4);
1375
1376        buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1377        buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1378        buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1379        memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1380
1381        /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1382        buf->Name[0] = 'D';
1383        buf->Name[1] = 'H';
1384        buf->Name[2] = '2';
1385        buf->Name[3] = 'C';
1386        return buf;
1387}
1388
1389static int
1390add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1391                    struct cifs_open_parms *oparms)
1392{
1393        struct smb2_create_req *req = iov[0].iov_base;
1394        unsigned int num = *num_iovec;
1395
1396        iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1397        if (iov[num].iov_base == NULL)
1398                return -ENOMEM;
1399        iov[num].iov_len = sizeof(struct create_durable_v2);
1400        if (!req->CreateContextsOffset)
1401                req->CreateContextsOffset =
1402                        cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1403                                                                iov[1].iov_len);
1404        le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1405        inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1406        *num_iovec = num + 1;
1407        return 0;
1408}
1409
1410static int
1411add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1412                    struct cifs_open_parms *oparms)
1413{
1414        struct smb2_create_req *req = iov[0].iov_base;
1415        unsigned int num = *num_iovec;
1416
1417        /* indicate that we don't need to relock the file */
1418        oparms->reconnect = false;
1419
1420        iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1421        if (iov[num].iov_base == NULL)
1422                return -ENOMEM;
1423        iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1424        if (!req->CreateContextsOffset)
1425                req->CreateContextsOffset =
1426                        cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1427                                                                iov[1].iov_len);
1428        le32_add_cpu(&req->CreateContextsLength,
1429                        sizeof(struct create_durable_handle_reconnect_v2));
1430        inc_rfc1001_len(&req->hdr,
1431                        sizeof(struct create_durable_handle_reconnect_v2));
1432        *num_iovec = num + 1;
1433        return 0;
1434}
1435
1436static int
1437add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1438                    struct cifs_open_parms *oparms, bool use_persistent)
1439{
1440        struct smb2_create_req *req = iov[0].iov_base;
1441        unsigned int num = *num_iovec;
1442
1443        if (use_persistent) {
1444                if (oparms->reconnect)
1445                        return add_durable_reconnect_v2_context(iov, num_iovec,
1446                                                                oparms);
1447                else
1448                        return add_durable_v2_context(iov, num_iovec, oparms);
1449        }
1450
1451        if (oparms->reconnect) {
1452                iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1453                /* indicate that we don't need to relock the file */
1454                oparms->reconnect = false;
1455        } else
1456                iov[num].iov_base = create_durable_buf();
1457        if (iov[num].iov_base == NULL)
1458                return -ENOMEM;
1459        iov[num].iov_len = sizeof(struct create_durable);
1460        if (!req->CreateContextsOffset)
1461                req->CreateContextsOffset =
1462                        cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1463                                                                iov[1].iov_len);
1464        le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1465        inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1466        *num_iovec = num + 1;
1467        return 0;
1468}
1469
1470int
1471SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1472          __u8 *oplock, struct smb2_file_all_info *buf,
1473          struct smb2_err_rsp **err_buf)
1474{
1475        struct smb2_create_req *req;
1476        struct smb2_create_rsp *rsp;
1477        struct TCP_Server_Info *server;
1478        struct cifs_tcon *tcon = oparms->tcon;
1479        struct cifs_ses *ses = tcon->ses;
1480        struct kvec iov[4];
1481        int resp_buftype;
1482        int uni_path_len;
1483        __le16 *copy_path = NULL;
1484        int copy_size;
1485        int rc = 0;
1486        unsigned int num_iovecs = 2;
1487        __u32 file_attributes = 0;
1488        char *dhc_buf = NULL, *lc_buf = NULL;
1489
1490        cifs_dbg(FYI, "create/open\n");
1491
1492        if (ses && (ses->server))
1493                server = ses->server;
1494        else
1495                return -EIO;
1496
1497        rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1498        if (rc)
1499                return rc;
1500
1501        if (oparms->create_options & CREATE_OPTION_READONLY)
1502                file_attributes |= ATTR_READONLY;
1503        if (oparms->create_options & CREATE_OPTION_SPECIAL)
1504                file_attributes |= ATTR_SYSTEM;
1505
1506        req->ImpersonationLevel = IL_IMPERSONATION;
1507        req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1508        /* File attributes ignored on open (used in create though) */
1509        req->FileAttributes = cpu_to_le32(file_attributes);
1510        req->ShareAccess = FILE_SHARE_ALL_LE;
1511        req->CreateDisposition = cpu_to_le32(oparms->disposition);
1512        req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1513        uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1514        /* do not count rfc1001 len field */
1515        req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1516
1517        iov[0].iov_base = (char *)req;
1518        /* 4 for rfc1002 length field */
1519        iov[0].iov_len = get_rfc1002_length(req) + 4;
1520
1521        /* MUST set path len (NameLength) to 0 opening root of share */
1522        req->NameLength = cpu_to_le16(uni_path_len - 2);
1523        /* -1 since last byte is buf[0] which is sent below (path) */
1524        iov[0].iov_len--;
1525        if (uni_path_len % 8 != 0) {
1526                copy_size = uni_path_len / 8 * 8;
1527                if (copy_size < uni_path_len)
1528                        copy_size += 8;
1529
1530                copy_path = kzalloc(copy_size, GFP_KERNEL);
1531                if (!copy_path)
1532                        return -ENOMEM;
1533                memcpy((char *)copy_path, (const char *)path,
1534                        uni_path_len);
1535                uni_path_len = copy_size;
1536                path = copy_path;
1537        }
1538
1539        iov[1].iov_len = uni_path_len;
1540        iov[1].iov_base = path;
1541        /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1542        inc_rfc1001_len(req, uni_path_len - 1);
1543
1544        if (!server->oplocks)
1545                *oplock = SMB2_OPLOCK_LEVEL_NONE;
1546
1547        if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1548            *oplock == SMB2_OPLOCK_LEVEL_NONE)
1549                req->RequestedOplockLevel = *oplock;
1550        else {
1551                rc = add_lease_context(server, iov, &num_iovecs, oplock);
1552                if (rc) {
1553                        cifs_small_buf_release(req);
1554                        kfree(copy_path);
1555                        return rc;
1556                }
1557                lc_buf = iov[num_iovecs-1].iov_base;
1558        }
1559
1560        if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1561                /* need to set Next field of lease context if we request it */
1562                if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1563                        struct create_context *ccontext =
1564                            (struct create_context *)iov[num_iovecs-1].iov_base;
1565                        ccontext->Next =
1566                                cpu_to_le32(server->vals->create_lease_size);
1567                }
1568
1569                rc = add_durable_context(iov, &num_iovecs, oparms,
1570                                        tcon->use_persistent);
1571                if (rc) {
1572                        cifs_small_buf_release(req);
1573                        kfree(copy_path);
1574                        kfree(lc_buf);
1575                        return rc;
1576                }
1577                dhc_buf = iov[num_iovecs-1].iov_base;
1578        }
1579
1580        rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1581        rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1582
1583        if (rc != 0) {
1584                cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1585                if (err_buf)
1586                        *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1587                                           GFP_KERNEL);
1588                goto creat_exit;
1589        }
1590
1591        oparms->fid->persistent_fid = rsp->PersistentFileId;
1592        oparms->fid->volatile_fid = rsp->VolatileFileId;
1593
1594        if (buf) {
1595                memcpy(buf, &rsp->CreationTime, 32);
1596                buf->AllocationSize = rsp->AllocationSize;
1597                buf->EndOfFile = rsp->EndofFile;
1598                buf->Attributes = rsp->FileAttributes;
1599                buf->NumberOfLinks = cpu_to_le32(1);
1600                buf->DeletePending = 0;
1601        }
1602
1603        if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1604                *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1605        else
1606                *oplock = rsp->OplockLevel;
1607creat_exit:
1608        kfree(copy_path);
1609        kfree(lc_buf);
1610        kfree(dhc_buf);
1611        free_rsp_buf(resp_buftype, rsp);
1612        return rc;
1613}
1614
1615/*
1616 *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1617 */
1618int
1619SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1620           u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1621           u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1622{
1623        struct smb2_ioctl_req *req;
1624        struct smb2_ioctl_rsp *rsp;
1625        struct TCP_Server_Info *server;
1626        struct cifs_ses *ses;
1627        struct kvec iov[2];
1628        int resp_buftype;
1629        int num_iovecs;
1630        int rc = 0;
1631
1632        cifs_dbg(FYI, "SMB2 IOCTL\n");
1633
1634        if (out_data != NULL)
1635                *out_data = NULL;
1636
1637        /* zero out returned data len, in case of error */
1638        if (plen)
1639                *plen = 0;
1640
1641        if (tcon)
1642                ses = tcon->ses;
1643        else
1644                return -EIO;
1645
1646        if (ses && (ses->server))
1647                server = ses->server;
1648        else
1649                return -EIO;
1650
1651        rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1652        if (rc)
1653                return rc;
1654
1655        req->CtlCode = cpu_to_le32(opcode);
1656        req->PersistentFileId = persistent_fid;
1657        req->VolatileFileId = volatile_fid;
1658
1659        if (indatalen) {
1660                req->InputCount = cpu_to_le32(indatalen);
1661                /* do not set InputOffset if no input data */
1662                req->InputOffset =
1663                       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1664                iov[1].iov_base = in_data;
1665                iov[1].iov_len = indatalen;
1666                num_iovecs = 2;
1667        } else
1668                num_iovecs = 1;
1669
1670        req->OutputOffset = 0;
1671        req->OutputCount = 0; /* MBZ */
1672
1673        /*
1674         * Could increase MaxOutputResponse, but that would require more
1675         * than one credit. Windows typically sets this smaller, but for some
1676         * ioctls it may be useful to allow server to send more. No point
1677         * limiting what the server can send as long as fits in one credit
1678         */
1679        req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1680
1681        if (is_fsctl)
1682                req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1683        else
1684                req->Flags = 0;
1685
1686        iov[0].iov_base = (char *)req;
1687
1688        /*
1689         * If no input data, the size of ioctl struct in
1690         * protocol spec still includes a 1 byte data buffer,
1691         * but if input data passed to ioctl, we do not
1692         * want to double count this, so we do not send
1693         * the dummy one byte of data in iovec[0] if sending
1694         * input data (in iovec[1]). We also must add 4 bytes
1695         * in first iovec to allow for rfc1002 length field.
1696         */
1697
1698        if (indatalen) {
1699                iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1700                inc_rfc1001_len(req, indatalen - 1);
1701        } else
1702                iov[0].iov_len = get_rfc1002_length(req) + 4;
1703
1704
1705        rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1706        rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1707
1708        if ((rc != 0) && (rc != -EINVAL)) {
1709                cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1710                goto ioctl_exit;
1711        } else if (rc == -EINVAL) {
1712                if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1713                    (opcode != FSCTL_SRV_COPYCHUNK)) {
1714                        cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1715                        goto ioctl_exit;
1716                }
1717        }
1718
1719        /* check if caller wants to look at return data or just return rc */
1720        if ((plen == NULL) || (out_data == NULL))
1721                goto ioctl_exit;
1722
1723        *plen = le32_to_cpu(rsp->OutputCount);
1724
1725        /* We check for obvious errors in the output buffer length and offset */
1726        if (*plen == 0)
1727                goto ioctl_exit; /* server returned no data */
1728        else if (*plen > 0xFF00) {
1729                cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1730                *plen = 0;
1731                rc = -EIO;
1732                goto ioctl_exit;
1733        }
1734
1735        if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1736                cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1737                        le32_to_cpu(rsp->OutputOffset));
1738                *plen = 0;
1739                rc = -EIO;
1740                goto ioctl_exit;
1741        }
1742
1743        *out_data = kmalloc(*plen, GFP_KERNEL);
1744        if (*out_data == NULL) {
1745                rc = -ENOMEM;
1746                goto ioctl_exit;
1747        }
1748
1749        memcpy(*out_data,
1750               (char *)&rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1751               *plen);
1752ioctl_exit:
1753        free_rsp_buf(resp_buftype, rsp);
1754        return rc;
1755}
1756
1757/*
1758 *   Individual callers to ioctl worker function follow
1759 */
1760
1761int
1762SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1763                     u64 persistent_fid, u64 volatile_fid)
1764{
1765        int rc;
1766        struct  compress_ioctl fsctl_input;
1767        char *ret_data = NULL;
1768
1769        fsctl_input.CompressionState =
1770                        cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1771
1772        rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1773                        FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1774                        (char *)&fsctl_input /* data input */,
1775                        2 /* in data len */, &ret_data /* out data */, NULL);
1776
1777        cifs_dbg(FYI, "set compression rc %d\n", rc);
1778
1779        return rc;
1780}
1781
1782int
1783SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1784           u64 persistent_fid, u64 volatile_fid)
1785{
1786        struct smb2_close_req *req;
1787        struct smb2_close_rsp *rsp;
1788        struct TCP_Server_Info *server;
1789        struct cifs_ses *ses = tcon->ses;
1790        struct kvec iov[1];
1791        int resp_buftype;
1792        int rc = 0;
1793
1794        cifs_dbg(FYI, "Close\n");
1795
1796        if (ses && (ses->server))
1797                server = ses->server;
1798        else
1799                return -EIO;
1800
1801        rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1802        if (rc)
1803                return rc;
1804
1805        req->PersistentFileId = persistent_fid;
1806        req->VolatileFileId = volatile_fid;
1807
1808        iov[0].iov_base = (char *)req;
1809        /* 4 for rfc1002 length field */
1810        iov[0].iov_len = get_rfc1002_length(req) + 4;
1811
1812        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1813        rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1814
1815        if (rc != 0) {
1816                cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1817                goto close_exit;
1818        }
1819
1820        /* BB FIXME - decode close response, update inode for caching */
1821
1822close_exit:
1823        free_rsp_buf(resp_buftype, rsp);
1824        return rc;
1825}
1826
1827static int
1828validate_buf(unsigned int offset, unsigned int buffer_length,
1829             struct smb2_hdr *hdr, unsigned int min_buf_size)
1830
1831{
1832        unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1833        char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1834        char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1835        char *end_of_buf = begin_of_buf + buffer_length;
1836
1837
1838        if (buffer_length < min_buf_size) {
1839                cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1840                         buffer_length, min_buf_size);
1841                return -EINVAL;
1842        }
1843
1844        /* check if beyond RFC1001 maximum length */
1845        if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1846                cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1847                         buffer_length, smb_len);
1848                return -EINVAL;
1849        }
1850
1851        if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1852                cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1853                return -EINVAL;
1854        }
1855
1856        return 0;
1857}
1858
1859/*
1860 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1861 * Caller must free buffer.
1862 */
1863static int
1864validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1865                      struct smb2_hdr *hdr, unsigned int minbufsize,
1866                      char *data)
1867
1868{
1869        char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1870        int rc;
1871
1872        if (!data)
1873                return -EINVAL;
1874
1875        rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1876        if (rc)
1877                return rc;
1878
1879        memcpy(data, begin_of_buf, buffer_length);
1880
1881        return 0;
1882}
1883
1884static int
1885query_info(const unsigned int xid, struct cifs_tcon *tcon,
1886           u64 persistent_fid, u64 volatile_fid, u8 info_class,
1887           size_t output_len, size_t min_len, void *data)
1888{
1889        struct smb2_query_info_req *req;
1890        struct smb2_query_info_rsp *rsp = NULL;
1891        struct kvec iov[2];
1892        int rc = 0;
1893        int resp_buftype;
1894        struct TCP_Server_Info *server;
1895        struct cifs_ses *ses = tcon->ses;
1896
1897        cifs_dbg(FYI, "Query Info\n");
1898
1899        if (ses && (ses->server))
1900                server = ses->server;
1901        else
1902                return -EIO;
1903
1904        rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1905        if (rc)
1906                return rc;
1907
1908        req->InfoType = SMB2_O_INFO_FILE;
1909        req->FileInfoClass = info_class;
1910        req->PersistentFileId = persistent_fid;
1911        req->VolatileFileId = volatile_fid;
1912        /* 4 for rfc1002 length field and 1 for Buffer */
1913        req->InputBufferOffset =
1914                cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1915        req->OutputBufferLength = cpu_to_le32(output_len);
1916
1917        iov[0].iov_base = (char *)req;
1918        /* 4 for rfc1002 length field */
1919        iov[0].iov_len = get_rfc1002_length(req) + 4;
1920
1921        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1922        rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1923
1924        if (rc) {
1925                cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1926                goto qinf_exit;
1927        }
1928
1929        rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1930                                   le32_to_cpu(rsp->OutputBufferLength),
1931                                   &rsp->hdr, min_len, data);
1932
1933qinf_exit:
1934        free_rsp_buf(resp_buftype, rsp);
1935        return rc;
1936}
1937
1938int
1939SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1940                u64 persistent_fid, u64 volatile_fid,
1941                struct smb2_file_all_info *data)
1942{
1943        return query_info(xid, tcon, persistent_fid, volatile_fid,
1944                          FILE_ALL_INFORMATION,
1945                          sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1946                          sizeof(struct smb2_file_all_info), data);
1947}
1948
1949int
1950SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1951                 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1952{
1953        return query_info(xid, tcon, persistent_fid, volatile_fid,
1954                          FILE_INTERNAL_INFORMATION,
1955                          sizeof(struct smb2_file_internal_info),
1956                          sizeof(struct smb2_file_internal_info), uniqueid);
1957}
1958
1959/*
1960 * This is a no-op for now. We're not really interested in the reply, but
1961 * rather in the fact that the server sent one and that server->lstrp
1962 * gets updated.
1963 *
1964 * FIXME: maybe we should consider checking that the reply matches request?
1965 */
1966static void
1967smb2_echo_callback(struct mid_q_entry *mid)
1968{
1969        struct TCP_Server_Info *server = mid->callback_data;
1970        struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1971        unsigned int credits_received = 1;
1972
1973        if (mid->mid_state == MID_RESPONSE_RECEIVED)
1974                credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1975
1976        mutex_lock(&server->srv_mutex);
1977        DeleteMidQEntry(mid);
1978        mutex_unlock(&server->srv_mutex);
1979        add_credits(server, credits_received, CIFS_ECHO_OP);
1980}
1981
1982void smb2_reconnect_server(struct work_struct *work)
1983{
1984        struct TCP_Server_Info *server = container_of(work,
1985                                        struct TCP_Server_Info, reconnect.work);
1986        struct cifs_ses *ses;
1987        struct cifs_tcon *tcon, *tcon2;
1988        struct list_head tmp_list;
1989        int tcon_exist = false;
1990        int rc;
1991        int resched = false;
1992
1993
1994        /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
1995        mutex_lock(&server->reconnect_mutex);
1996
1997        INIT_LIST_HEAD(&tmp_list);
1998        cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
1999
2000        spin_lock(&cifs_tcp_ses_lock);
2001        list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2002                list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2003                        if (tcon->need_reconnect || tcon->need_reopen_files) {
2004                                tcon->tc_count++;
2005                                list_add_tail(&tcon->rlist, &tmp_list);
2006                                tcon_exist = true;
2007                        }
2008                }
2009        }
2010        /*
2011         * Get the reference to server struct to be sure that the last call of
2012         * cifs_put_tcon() in the loop below won't release the server pointer.
2013         */
2014        if (tcon_exist)
2015                server->srv_count++;
2016
2017        spin_unlock(&cifs_tcp_ses_lock);
2018
2019        list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2020                rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2021                if (!rc)
2022                        cifs_reopen_persistent_handles(tcon);
2023                else
2024                        resched = true;
2025                list_del_init(&tcon->rlist);
2026                cifs_put_tcon(tcon);
2027        }
2028
2029        cifs_dbg(FYI, "Reconnecting tcons finished\n");
2030        if (resched)
2031                queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2032        mutex_unlock(&server->reconnect_mutex);
2033
2034        /* now we can safely release srv struct */
2035        if (tcon_exist)
2036                cifs_put_tcp_session(server, 1);
2037}
2038
2039int
2040SMB2_echo(struct TCP_Server_Info *server)
2041{
2042        struct smb2_echo_req *req;
2043        int rc = 0;
2044        struct kvec iov;
2045        struct smb_rqst rqst = { .rq_iov = &iov,
2046                                 .rq_nvec = 1 };
2047
2048        cifs_dbg(FYI, "In echo request\n");
2049
2050        if (server->tcpStatus == CifsNeedNegotiate) {
2051                /* No need to send echo on newly established connections */
2052                queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2053                return rc;
2054        }
2055
2056        rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2057        if (rc)
2058                return rc;
2059
2060        req->hdr.CreditRequest = cpu_to_le16(1);
2061
2062        iov.iov_base = (char *)req;
2063        /* 4 for rfc1002 length field */
2064        iov.iov_len = get_rfc1002_length(req) + 4;
2065
2066        rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
2067                             CIFS_ECHO_OP);
2068        if (rc)
2069                cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2070
2071        cifs_small_buf_release(req);
2072        return rc;
2073}
2074
2075int
2076SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2077           u64 volatile_fid)
2078{
2079        struct smb2_flush_req *req;
2080        struct TCP_Server_Info *server;
2081        struct cifs_ses *ses = tcon->ses;
2082        struct kvec iov[1];
2083        int resp_buftype;
2084        int rc = 0;
2085
2086        cifs_dbg(FYI, "Flush\n");
2087
2088        if (ses && (ses->server))
2089                server = ses->server;
2090        else
2091                return -EIO;
2092
2093        rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2094        if (rc)
2095                return rc;
2096
2097        req->PersistentFileId = persistent_fid;
2098        req->VolatileFileId = volatile_fid;
2099
2100        iov[0].iov_base = (char *)req;
2101        /* 4 for rfc1002 length field */
2102        iov[0].iov_len = get_rfc1002_length(req) + 4;
2103
2104        rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
2105
2106        if (rc != 0)
2107                cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2108
2109        free_rsp_buf(resp_buftype, iov[0].iov_base);
2110        return rc;
2111}
2112
2113/*
2114 * To form a chain of read requests, any read requests after the first should
2115 * have the end_of_chain boolean set to true.
2116 */
2117static int
2118smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
2119                  unsigned int remaining_bytes, int request_type)
2120{
2121        int rc = -EACCES;
2122        struct smb2_read_req *req = NULL;
2123
2124        rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
2125        if (rc)
2126                return rc;
2127        if (io_parms->tcon->ses->server == NULL)
2128                return -ECONNABORTED;
2129
2130        req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2131
2132        req->PersistentFileId = io_parms->persistent_fid;
2133        req->VolatileFileId = io_parms->volatile_fid;
2134        req->ReadChannelInfoOffset = 0; /* reserved */
2135        req->ReadChannelInfoLength = 0; /* reserved */
2136        req->Channel = 0; /* reserved */
2137        req->MinimumCount = 0;
2138        req->Length = cpu_to_le32(io_parms->length);
2139        req->Offset = cpu_to_le64(io_parms->offset);
2140
2141        if (request_type & CHAINED_REQUEST) {
2142                if (!(request_type & END_OF_CHAIN)) {
2143                        /* 4 for rfc1002 length field */
2144                        req->hdr.NextCommand =
2145                                cpu_to_le32(get_rfc1002_length(req) + 4);
2146                } else /* END_OF_CHAIN */
2147                        req->hdr.NextCommand = 0;
2148                if (request_type & RELATED_REQUEST) {
2149                        req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2150                        /*
2151                         * Related requests use info from previous read request
2152                         * in chain.
2153                         */
2154                        req->hdr.SessionId = 0xFFFFFFFF;
2155                        req->hdr.TreeId = 0xFFFFFFFF;
2156                        req->PersistentFileId = 0xFFFFFFFF;
2157                        req->VolatileFileId = 0xFFFFFFFF;
2158                }
2159        }
2160        if (remaining_bytes > io_parms->length)
2161                req->RemainingBytes = cpu_to_le32(remaining_bytes);
2162        else
2163                req->RemainingBytes = 0;
2164
2165        iov[0].iov_base = (char *)req;
2166        /* 4 for rfc1002 length field */
2167        iov[0].iov_len = get_rfc1002_length(req) + 4;
2168        return rc;
2169}
2170
2171static void
2172smb2_readv_callback(struct mid_q_entry *mid)
2173{
2174        struct cifs_readdata *rdata = mid->callback_data;
2175        struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2176        struct TCP_Server_Info *server = tcon->ses->server;
2177        struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
2178        unsigned int credits_received = 1;
2179        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2180                                 .rq_nvec = 1,
2181                                 .rq_pages = rdata->pages,
2182                                 .rq_npages = rdata->nr_pages,
2183                                 .rq_pagesz = rdata->pagesz,
2184                                 .rq_tailsz = rdata->tailsz };
2185
2186        cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2187                 __func__, mid->mid, mid->mid_state, rdata->result,
2188                 rdata->bytes);
2189
2190        switch (mid->mid_state) {
2191        case MID_RESPONSE_RECEIVED:
2192                credits_received = le16_to_cpu(buf->CreditRequest);
2193                /* result already set, check signature */
2194                if (server->sign) {
2195                        int rc;
2196
2197                        rc = smb2_verify_signature(&rqst, server);
2198                        if (rc)
2199                                cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2200                                         rc);
2201                }
2202                /* FIXME: should this be counted toward the initiating task? */
2203                task_io_account_read(rdata->got_bytes);
2204                cifs_stats_bytes_read(tcon, rdata->got_bytes);
2205                break;
2206        case MID_REQUEST_SUBMITTED:
2207        case MID_RETRY_NEEDED:
2208                rdata->result = -EAGAIN;
2209                if (server->sign && rdata->got_bytes)
2210                        /* reset bytes number since we can not check a sign */
2211                        rdata->got_bytes = 0;
2212                /* FIXME: should this be counted toward the initiating task? */
2213                task_io_account_read(rdata->got_bytes);
2214                cifs_stats_bytes_read(tcon, rdata->got_bytes);
2215                break;
2216        default:
2217                if (rdata->result != -ENODATA)
2218                        rdata->result = -EIO;
2219        }
2220
2221        if (rdata->result)
2222                cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2223
2224        queue_work(cifsiod_wq, &rdata->work);
2225        mutex_lock(&server->srv_mutex);
2226        DeleteMidQEntry(mid);
2227        mutex_unlock(&server->srv_mutex);
2228        add_credits(server, credits_received, 0);
2229}
2230
2231/* smb2_async_readv - send an async write, and set up mid to handle result */
2232int
2233smb2_async_readv(struct cifs_readdata *rdata)
2234{
2235        int rc, flags = 0;
2236        struct smb2_hdr *buf;
2237        struct cifs_io_parms io_parms;
2238        struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2239                                 .rq_nvec = 1 };
2240        struct TCP_Server_Info *server;
2241
2242        cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2243                 __func__, rdata->offset, rdata->bytes);
2244
2245        io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2246        io_parms.offset = rdata->offset;
2247        io_parms.length = rdata->bytes;
2248        io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2249        io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2250        io_parms.pid = rdata->pid;
2251
2252        server = io_parms.tcon->ses->server;
2253
2254        rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2255        if (rc) {
2256                if (rc == -EAGAIN && rdata->credits) {
2257                        /* credits was reset by reconnect */
2258                        rdata->credits = 0;
2259                        /* reduce in_flight value since we won't send the req */
2260                        spin_lock(&server->req_lock);
2261                        server->in_flight--;
2262                        spin_unlock(&server->req_lock);
2263                }
2264                return rc;
2265        }
2266
2267        buf = (struct smb2_hdr *)rdata->iov.iov_base;
2268        /* 4 for rfc1002 length field */
2269        rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2270
2271        if (rdata->credits) {
2272                buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2273                                                SMB2_MAX_BUFFER_SIZE));
2274                buf->CreditRequest = buf->CreditCharge;
2275                spin_lock(&server->req_lock);
2276                server->credits += rdata->credits -
2277                                                le16_to_cpu(buf->CreditCharge);
2278                spin_unlock(&server->req_lock);
2279                wake_up(&server->request_q);
2280                flags = CIFS_HAS_CREDITS;
2281        }
2282
2283        kref_get(&rdata->refcount);
2284        rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2285                             cifs_readv_receive, smb2_readv_callback,
2286                             rdata, flags);
2287        if (rc) {
2288                kref_put(&rdata->refcount, cifs_readdata_release);
2289                cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2290        }
2291
2292        cifs_small_buf_release(buf);
2293        return rc;
2294}
2295
2296int
2297SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2298          unsigned int *nbytes, char **buf, int *buf_type)
2299{
2300        int resp_buftype, rc = -EACCES;
2301        struct smb2_read_rsp *rsp = NULL;
2302        struct kvec iov[1];
2303
2304        *nbytes = 0;
2305        rc = smb2_new_read_req(iov, io_parms, 0, 0);
2306        if (rc)
2307                return rc;
2308
2309        rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2310                          &resp_buftype, CIFS_LOG_ERROR);
2311
2312        rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2313
2314        if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2315                free_rsp_buf(resp_buftype, iov[0].iov_base);
2316                return 0;
2317        }
2318
2319        if (rc) {
2320                cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2321                cifs_dbg(VFS, "Send error in read = %d\n", rc);
2322        } else {
2323                *nbytes = le32_to_cpu(rsp->DataLength);
2324                if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2325                    (*nbytes > io_parms->length)) {
2326                        cifs_dbg(FYI, "bad length %d for count %d\n",
2327                                 *nbytes, io_parms->length);
2328                        rc = -EIO;
2329                        *nbytes = 0;
2330                }
2331        }
2332
2333        if (*buf) {
2334                memcpy(*buf, (char *)&rsp->hdr.ProtocolId + rsp->DataOffset,
2335                       *nbytes);
2336                free_rsp_buf(resp_buftype, iov[0].iov_base);
2337        } else if (resp_buftype != CIFS_NO_BUFFER) {
2338                *buf = iov[0].iov_base;
2339                if (resp_buftype == CIFS_SMALL_BUFFER)
2340                        *buf_type = CIFS_SMALL_BUFFER;
2341                else if (resp_buftype == CIFS_LARGE_BUFFER)
2342                        *buf_type = CIFS_LARGE_BUFFER;
2343        }
2344        return rc;
2345}
2346
2347/*
2348 * Check the mid_state and signature on received buffer (if any), and queue the
2349 * workqueue completion task.
2350 */
2351static void
2352smb2_writev_callback(struct mid_q_entry *mid)
2353{
2354        struct cifs_writedata *wdata = mid->callback_data;
2355        struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2356        struct TCP_Server_Info *server = tcon->ses->server;
2357        unsigned int written;
2358        struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2359        unsigned int credits_received = 1;
2360
2361        switch (mid->mid_state) {
2362        case MID_RESPONSE_RECEIVED:
2363                credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2364                wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2365                if (wdata->result != 0)
2366                        break;
2367
2368                written = le32_to_cpu(rsp->DataLength);
2369                /*
2370                 * Mask off high 16 bits when bytes written as returned
2371                 * by the server is greater than bytes requested by the
2372                 * client. OS/2 servers are known to set incorrect
2373                 * CountHigh values.
2374                 */
2375                if (written > wdata->bytes)
2376                        written &= 0xFFFF;
2377
2378                if (written < wdata->bytes)
2379                        wdata->result = -ENOSPC;
2380                else
2381                        wdata->bytes = written;
2382                break;
2383        case MID_REQUEST_SUBMITTED:
2384        case MID_RETRY_NEEDED:
2385                wdata->result = -EAGAIN;
2386                break;
2387        default:
2388                wdata->result = -EIO;
2389                break;
2390        }
2391
2392        if (wdata->result)
2393                cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2394
2395        queue_work(cifsiod_wq, &wdata->work);
2396        mutex_lock(&server->srv_mutex);
2397        DeleteMidQEntry(mid);
2398        mutex_unlock(&server->srv_mutex);
2399        add_credits(tcon->ses->server, credits_received, 0);
2400}
2401
2402/* smb2_async_writev - send an async write, and set up mid to handle result */
2403int
2404smb2_async_writev(struct cifs_writedata *wdata,
2405                  void (*release)(struct kref *kref))
2406{
2407        int rc = -EACCES, flags = 0;
2408        struct smb2_write_req *req = NULL;
2409        struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2410        struct TCP_Server_Info *server = tcon->ses->server;
2411        struct kvec iov;
2412        struct smb_rqst rqst;
2413
2414        rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2415        if (rc) {
2416                if (rc == -EAGAIN && wdata->credits) {
2417                        /* credits was reset by reconnect */
2418                        wdata->credits = 0;
2419                        /* reduce in_flight value since we won't send the req */
2420                        spin_lock(&server->req_lock);
2421                        server->in_flight--;
2422                        spin_unlock(&server->req_lock);
2423                }
2424                goto async_writev_out;
2425        }
2426
2427        req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2428
2429        req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2430        req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2431        req->WriteChannelInfoOffset = 0;
2432        req->WriteChannelInfoLength = 0;
2433        req->Channel = 0;
2434        req->Offset = cpu_to_le64(wdata->offset);
2435        /* 4 for rfc1002 length field */
2436        req->DataOffset = cpu_to_le16(
2437                                offsetof(struct smb2_write_req, Buffer) - 4);
2438        req->RemainingBytes = 0;
2439
2440        /* 4 for rfc1002 length field and 1 for Buffer */
2441        iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2442        iov.iov_base = req;
2443
2444        rqst.rq_iov = &iov;
2445        rqst.rq_nvec = 1;
2446        rqst.rq_pages = wdata->pages;
2447        rqst.rq_npages = wdata->nr_pages;
2448        rqst.rq_pagesz = wdata->pagesz;
2449        rqst.rq_tailsz = wdata->tailsz;
2450
2451        cifs_dbg(FYI, "async write at %llu %u bytes\n",
2452                 wdata->offset, wdata->bytes);
2453
2454        req->Length = cpu_to_le32(wdata->bytes);
2455
2456        inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2457
2458        if (wdata->credits) {
2459                req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2460                                                    SMB2_MAX_BUFFER_SIZE));
2461                req->hdr.CreditRequest = req->hdr.CreditCharge;
2462                spin_lock(&server->req_lock);
2463                server->credits += wdata->credits -
2464                                        le16_to_cpu(req->hdr.CreditCharge);
2465                spin_unlock(&server->req_lock);
2466                wake_up(&server->request_q);
2467                flags = CIFS_HAS_CREDITS;
2468        }
2469
2470        kref_get(&wdata->refcount);
2471        rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2472                             flags);
2473
2474        if (rc) {
2475                kref_put(&wdata->refcount, release);
2476                cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2477        }
2478
2479async_writev_out:
2480        cifs_small_buf_release(req);
2481        return rc;
2482}
2483
2484/*
2485 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2486 * The length field from io_parms must be at least 1 and indicates a number of
2487 * elements with data to write that begins with position 1 in iov array. All
2488 * data length is specified by count.
2489 */
2490int
2491SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2492           unsigned int *nbytes, struct kvec *iov, int n_vec)
2493{
2494        int rc = 0;
2495        struct smb2_write_req *req = NULL;
2496        struct smb2_write_rsp *rsp = NULL;
2497        int resp_buftype;
2498        *nbytes = 0;
2499
2500        if (n_vec < 1)
2501                return rc;
2502
2503        rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2504        if (rc)
2505                return rc;
2506
2507        if (io_parms->tcon->ses->server == NULL)
2508                return -ECONNABORTED;
2509
2510        req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2511
2512        req->PersistentFileId = io_parms->persistent_fid;
2513        req->VolatileFileId = io_parms->volatile_fid;
2514        req->WriteChannelInfoOffset = 0;
2515        req->WriteChannelInfoLength = 0;
2516        req->Channel = 0;
2517        req->Length = cpu_to_le32(io_parms->length);
2518        req->Offset = cpu_to_le64(io_parms->offset);
2519        /* 4 for rfc1002 length field */
2520        req->DataOffset = cpu_to_le16(
2521                                offsetof(struct smb2_write_req, Buffer) - 4);
2522        req->RemainingBytes = 0;
2523
2524        iov[0].iov_base = (char *)req;
2525        /* 4 for rfc1002 length field and 1 for Buffer */
2526        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2527
2528        /* length of entire message including data to be written */
2529        inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2530
2531        rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2532                          &resp_buftype, 0);
2533        rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2534
2535        if (rc) {
2536                cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2537                cifs_dbg(VFS, "Send error in write = %d\n", rc);
2538        } else
2539                *nbytes = le32_to_cpu(rsp->DataLength);
2540
2541        free_rsp_buf(resp_buftype, rsp);
2542        return rc;
2543}
2544
2545static unsigned int
2546num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2547{
2548        int len;
2549        unsigned int entrycount = 0;
2550        unsigned int next_offset = 0;
2551        FILE_DIRECTORY_INFO *entryptr;
2552
2553        if (bufstart == NULL)
2554                return 0;
2555
2556        entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2557
2558        while (1) {
2559                entryptr = (FILE_DIRECTORY_INFO *)
2560                                        ((char *)entryptr + next_offset);
2561
2562                if ((char *)entryptr + size > end_of_buf) {
2563                        cifs_dbg(VFS, "malformed search entry would overflow\n");
2564                        break;
2565                }
2566
2567                len = le32_to_cpu(entryptr->FileNameLength);
2568                if ((char *)entryptr + len + size > end_of_buf) {
2569                        cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2570                                 end_of_buf);
2571                        break;
2572                }
2573
2574                *lastentry = (char *)entryptr;
2575                entrycount++;
2576
2577                next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2578                if (!next_offset)
2579                        break;
2580        }
2581
2582        return entrycount;
2583}
2584
2585/*
2586 * Readdir/FindFirst
2587 */
2588int
2589SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2590                     u64 persistent_fid, u64 volatile_fid, int index,
2591                     struct cifs_search_info *srch_inf)
2592{
2593        struct smb2_query_directory_req *req;
2594        struct smb2_query_directory_rsp *rsp = NULL;
2595        struct kvec iov[2];
2596        int rc = 0;
2597        int len;
2598        int resp_buftype = CIFS_NO_BUFFER;
2599        unsigned char *bufptr;
2600        struct TCP_Server_Info *server;
2601        struct cifs_ses *ses = tcon->ses;
2602        __le16 asteriks = cpu_to_le16('*');
2603        char *end_of_smb;
2604        unsigned int output_size = CIFSMaxBufSize;
2605        size_t info_buf_size;
2606
2607        if (ses && (ses->server))
2608                server = ses->server;
2609        else
2610                return -EIO;
2611
2612        rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2613        if (rc)
2614                return rc;
2615
2616        switch (srch_inf->info_level) {
2617        case SMB_FIND_FILE_DIRECTORY_INFO:
2618                req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2619                info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2620                break;
2621        case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2622                req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2623                info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2624                break;
2625        default:
2626                cifs_dbg(VFS, "info level %u isn't supported\n",
2627                         srch_inf->info_level);
2628                rc = -EINVAL;
2629                goto qdir_exit;
2630        }
2631
2632        req->FileIndex = cpu_to_le32(index);
2633        req->PersistentFileId = persistent_fid;
2634        req->VolatileFileId = volatile_fid;
2635
2636        len = 0x2;
2637        bufptr = req->Buffer;
2638        memcpy(bufptr, &asteriks, len);
2639
2640        req->FileNameOffset =
2641                cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2642        req->FileNameLength = cpu_to_le16(len);
2643        /*
2644         * BB could be 30 bytes or so longer if we used SMB2 specific
2645         * buffer lengths, but this is safe and close enough.
2646         */
2647        output_size = min_t(unsigned int, output_size, server->maxBuf);
2648        output_size = min_t(unsigned int, output_size, 2 << 15);
2649        req->OutputBufferLength = cpu_to_le32(output_size);
2650
2651        iov[0].iov_base = (char *)req;
2652        /* 4 for RFC1001 length and 1 for Buffer */
2653        iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2654
2655        iov[1].iov_base = (char *)(req->Buffer);
2656        iov[1].iov_len = len;
2657
2658        inc_rfc1001_len(req, len - 1 /* Buffer */);
2659
2660        rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2661        rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2662
2663        if (rc) {
2664                if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2665                        srch_inf->endOfSearch = true;
2666                        rc = 0;
2667                }
2668                cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2669                goto qdir_exit;
2670        }
2671
2672        rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2673                          le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2674                          info_buf_size);
2675        if (rc)
2676                goto qdir_exit;
2677
2678        srch_inf->unicode = true;
2679
2680        if (srch_inf->ntwrk_buf_start) {
2681                if (srch_inf->smallBuf)
2682                        cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2683                else
2684                        cifs_buf_release(srch_inf->ntwrk_buf_start);
2685        }
2686        srch_inf->ntwrk_buf_start = (char *)rsp;
2687        srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2688                (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2689        /* 4 for rfc1002 length field */
2690        end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2691        srch_inf->entries_in_buffer =
2692                        num_entries(srch_inf->srch_entries_start, end_of_smb,
2693                                    &srch_inf->last_entry, info_buf_size);
2694        srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2695        cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2696                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2697                 srch_inf->srch_entries_start, srch_inf->last_entry);
2698        if (resp_buftype == CIFS_LARGE_BUFFER)
2699                srch_inf->smallBuf = false;
2700        else if (resp_buftype == CIFS_SMALL_BUFFER)
2701                srch_inf->smallBuf = true;
2702        else
2703                cifs_dbg(VFS, "illegal search buffer type\n");
2704
2705        return rc;
2706
2707qdir_exit:
2708        free_rsp_buf(resp_buftype, rsp);
2709        return rc;
2710}
2711
2712static int
2713send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2714               u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2715               unsigned int num, void **data, unsigned int *size)
2716{
2717        struct smb2_set_info_req *req;
2718        struct smb2_set_info_rsp *rsp = NULL;
2719        struct kvec *iov;
2720        int rc = 0;
2721        int resp_buftype;
2722        unsigned int i;
2723        struct TCP_Server_Info *server;
2724        struct cifs_ses *ses = tcon->ses;
2725
2726        if (ses && (ses->server))
2727                server = ses->server;
2728        else
2729                return -EIO;
2730
2731        if (!num)
2732                return -EINVAL;
2733
2734        iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2735        if (!iov)
2736                return -ENOMEM;
2737
2738        rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2739        if (rc) {
2740                kfree(iov);
2741                return rc;
2742        }
2743
2744        req->hdr.ProcessId = cpu_to_le32(pid);
2745
2746        req->InfoType = SMB2_O_INFO_FILE;
2747        req->FileInfoClass = info_class;
2748        req->PersistentFileId = persistent_fid;
2749        req->VolatileFileId = volatile_fid;
2750
2751        /* 4 for RFC1001 length and 1 for Buffer */
2752        req->BufferOffset =
2753                        cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2754        req->BufferLength = cpu_to_le32(*size);
2755
2756        inc_rfc1001_len(req, *size - 1 /* Buffer */);
2757
2758        memcpy(req->Buffer, *data, *size);
2759
2760        iov[0].iov_base = (char *)req;
2761        /* 4 for RFC1001 length */
2762        iov[0].iov_len = get_rfc1002_length(req) + 4;
2763
2764        for (i = 1; i < num; i++) {
2765                inc_rfc1001_len(req, size[i]);
2766                le32_add_cpu(&req->BufferLength, size[i]);
2767                iov[i].iov_base = (char *)data[i];
2768                iov[i].iov_len = size[i];
2769        }
2770
2771        rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2772        rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2773
2774        if (rc != 0)
2775                cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2776
2777        free_rsp_buf(resp_buftype, rsp);
2778        kfree(iov);
2779        return rc;
2780}
2781
2782int
2783SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2784            u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2785{
2786        struct smb2_file_rename_info info;
2787        void **data;
2788        unsigned int size[2];
2789        int rc;
2790        int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2791
2792        data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2793        if (!data)
2794                return -ENOMEM;
2795
2796        info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2797                              /* 0 = fail if target already exists */
2798        info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2799        info.FileNameLength = cpu_to_le32(len);
2800
2801        data[0] = &info;
2802        size[0] = sizeof(struct smb2_file_rename_info);
2803
2804        data[1] = target_file;
2805        size[1] = len + 2 /* null */;
2806
2807        rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2808                           current->tgid, FILE_RENAME_INFORMATION, 2, data,
2809                           size);
2810        kfree(data);
2811        return rc;
2812}
2813
2814int
2815SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
2816                  u64 persistent_fid, u64 volatile_fid)
2817{
2818        __u8 delete_pending = 1;
2819        void *data;
2820        unsigned int size;
2821
2822        data = &delete_pending;
2823        size = 1; /* sizeof __u8 */
2824
2825        return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2826                        current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
2827                        &size);
2828}
2829
2830int
2831SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2832                  u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2833{
2834        struct smb2_file_link_info info;
2835        void **data;
2836        unsigned int size[2];
2837        int rc;
2838        int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2839
2840        data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2841        if (!data)
2842                return -ENOMEM;
2843
2844        info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2845                              /* 0 = fail if link already exists */
2846        info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2847        info.FileNameLength = cpu_to_le32(len);
2848
2849        data[0] = &info;
2850        size[0] = sizeof(struct smb2_file_link_info);
2851
2852        data[1] = target_file;
2853        size[1] = len + 2 /* null */;
2854
2855        rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2856                           current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2857        kfree(data);
2858        return rc;
2859}
2860
2861int
2862SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2863             u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2864{
2865        struct smb2_file_eof_info info;
2866        void *data;
2867        unsigned int size;
2868
2869        info.EndOfFile = *eof;
2870
2871        data = &info;
2872        size = sizeof(struct smb2_file_eof_info);
2873
2874        if (is_falloc)
2875                return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2876                        pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2877        else
2878                return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2879                        pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2880}
2881
2882int
2883SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2884              u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2885{
2886        unsigned int size;
2887        size = sizeof(FILE_BASIC_INFO);
2888        return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2889                             current->tgid, FILE_BASIC_INFORMATION, 1,
2890                             (void **)&buf, &size);
2891}
2892
2893int
2894SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2895                  const u64 persistent_fid, const u64 volatile_fid,
2896                  __u8 oplock_level)
2897{
2898        int rc;
2899        struct smb2_oplock_break *req = NULL;
2900
2901        cifs_dbg(FYI, "SMB2_oplock_break\n");
2902        rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2903
2904        if (rc)
2905                return rc;
2906
2907        req->VolatileFid = volatile_fid;
2908        req->PersistentFid = persistent_fid;
2909        req->OplockLevel = oplock_level;
2910        req->hdr.CreditRequest = cpu_to_le16(1);
2911
2912        rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2913        /* SMB2 buffer freed by function above */
2914
2915        if (rc) {
2916                cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2917                cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2918        }
2919
2920        return rc;
2921}
2922
2923static void
2924copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2925                        struct kstatfs *kst)
2926{
2927        kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2928                          le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2929        kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2930        kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2931        kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2932        return;
2933}
2934
2935static int
2936build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2937                   int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2938{
2939        int rc;
2940        struct smb2_query_info_req *req;
2941
2942        cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2943
2944        if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2945                return -EIO;
2946
2947        rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2948        if (rc)
2949                return rc;
2950
2951        req->InfoType = SMB2_O_INFO_FILESYSTEM;
2952        req->FileInfoClass = level;
2953        req->PersistentFileId = persistent_fid;
2954        req->VolatileFileId = volatile_fid;
2955        /* 4 for rfc1002 length field and 1 for pad */
2956        req->InputBufferOffset =
2957                        cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2958        req->OutputBufferLength = cpu_to_le32(
2959                outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2960
2961        iov->iov_base = (char *)req;
2962        /* 4 for rfc1002 length field */
2963        iov->iov_len = get_rfc1002_length(req) + 4;
2964        return 0;
2965}
2966
2967int
2968SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2969              u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2970{
2971        struct smb2_query_info_rsp *rsp = NULL;
2972        struct kvec iov;
2973        int rc = 0;
2974        int resp_buftype;
2975        struct cifs_ses *ses = tcon->ses;
2976        struct smb2_fs_full_size_info *info = NULL;
2977
2978        rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2979                                sizeof(struct smb2_fs_full_size_info),
2980                                persistent_fid, volatile_fid);
2981        if (rc)
2982                return rc;
2983
2984        rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2985        if (rc) {
2986                cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2987                goto qfsinf_exit;
2988        }
2989        rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2990
2991        info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2992                le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2993        rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2994                          le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2995                          sizeof(struct smb2_fs_full_size_info));
2996        if (!rc)
2997                copy_fs_info_to_kstatfs(info, fsdata);
2998
2999qfsinf_exit:
3000        free_rsp_buf(resp_buftype, iov.iov_base);
3001        return rc;
3002}
3003
3004int
3005SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3006              u64 persistent_fid, u64 volatile_fid, int level)
3007{
3008        struct smb2_query_info_rsp *rsp = NULL;
3009        struct kvec iov;
3010        int rc = 0;
3011        int resp_buftype, max_len, min_len;
3012        struct cifs_ses *ses = tcon->ses;
3013        unsigned int rsp_len, offset;
3014
3015        if (level == FS_DEVICE_INFORMATION) {
3016                max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3017                min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3018        } else if (level == FS_ATTRIBUTE_INFORMATION) {
3019                max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3020                min_len = MIN_FS_ATTR_INFO_SIZE;
3021        } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3022                max_len = sizeof(struct smb3_fs_ss_info);
3023                min_len = sizeof(struct smb3_fs_ss_info);
3024        } else {
3025                cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3026                return -EINVAL;
3027        }
3028
3029        rc = build_qfs_info_req(&iov, tcon, level, max_len,
3030                                persistent_fid, volatile_fid);
3031        if (rc)
3032                return rc;
3033
3034        rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
3035        if (rc) {
3036                cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3037                goto qfsattr_exit;
3038        }
3039        rsp = (struct smb2_query_info_rsp *)iov.iov_base;
3040
3041        rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3042        offset = le16_to_cpu(rsp->OutputBufferOffset);
3043        rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3044        if (rc)
3045                goto qfsattr_exit;
3046
3047        if (level == FS_ATTRIBUTE_INFORMATION)
3048                memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3049                        + (char *)&rsp->hdr, min_t(unsigned int,
3050                        rsp_len, max_len));
3051        else if (level == FS_DEVICE_INFORMATION)
3052                memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3053                        + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3054        else if (level == FS_SECTOR_SIZE_INFORMATION) {
3055                struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3056                        (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3057                tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3058                tcon->perf_sector_size =
3059                        le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3060        }
3061
3062qfsattr_exit:
3063        free_rsp_buf(resp_buftype, iov.iov_base);
3064        return rc;
3065}
3066
3067int
3068smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3069           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3070           const __u32 num_lock, struct smb2_lock_element *buf)
3071{
3072        int rc = 0;
3073        struct smb2_lock_req *req = NULL;
3074        struct kvec iov[2];
3075        int resp_buf_type;
3076        unsigned int count;
3077
3078        cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3079
3080        rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3081        if (rc)
3082                return rc;
3083
3084        req->hdr.ProcessId = cpu_to_le32(pid);
3085        req->LockCount = cpu_to_le16(num_lock);
3086
3087        req->PersistentFileId = persist_fid;
3088        req->VolatileFileId = volatile_fid;
3089
3090        count = num_lock * sizeof(struct smb2_lock_element);
3091        inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3092
3093        iov[0].iov_base = (char *)req;
3094        /* 4 for rfc1002 length field and count for all locks */
3095        iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3096        iov[1].iov_base = (char *)buf;
3097        iov[1].iov_len = count;
3098
3099        cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3100        rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
3101        if (rc) {
3102                cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3103                cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3104        }
3105
3106        return rc;
3107}
3108
3109int
3110SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3111          const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3112          const __u64 length, const __u64 offset, const __u32 lock_flags,
3113          const bool wait)
3114{
3115        struct smb2_lock_element lock;
3116
3117        lock.Offset = cpu_to_le64(offset);
3118        lock.Length = cpu_to_le64(length);
3119        lock.Flags = cpu_to_le32(lock_flags);
3120        if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3121                lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3122
3123        return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3124}
3125
3126int
3127SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3128                 __u8 *lease_key, const __le32 lease_state)
3129{
3130        int rc;
3131        struct smb2_lease_ack *req = NULL;
3132
3133        cifs_dbg(FYI, "SMB2_lease_break\n");
3134        rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3135
3136        if (rc)
3137                return rc;
3138
3139        req->hdr.CreditRequest = cpu_to_le16(1);
3140        req->StructureSize = cpu_to_le16(36);
3141        inc_rfc1001_len(req, 12);
3142
3143        memcpy(req->LeaseKey, lease_key, 16);
3144        req->LeaseState = lease_state;
3145
3146        rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
3147        /* SMB2 buffer freed by function above */
3148
3149        if (rc) {
3150                cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3151                cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3152        }
3153
3154        return rc;
3155}
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