Merge branches 'arm/rockchip', 'arm/exynos', 'arm/smmu', 'x86/vt-d', 'x86/amd', ...
[sfrench/cifs-2.6.git] / fs / cifs / smb2pdu.c
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
50 /*
51  *  The following table defines the expected "StructureSize" of SMB2 requests
52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
53  *
54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
55  *  indexed by command in host byte order.
56  */
57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
58         /* SMB2_NEGOTIATE */ 36,
59         /* SMB2_SESSION_SETUP */ 25,
60         /* SMB2_LOGOFF */ 4,
61         /* SMB2_TREE_CONNECT */ 9,
62         /* SMB2_TREE_DISCONNECT */ 4,
63         /* SMB2_CREATE */ 57,
64         /* SMB2_CLOSE */ 24,
65         /* SMB2_FLUSH */ 24,
66         /* SMB2_READ */ 49,
67         /* SMB2_WRITE */ 49,
68         /* SMB2_LOCK */ 48,
69         /* SMB2_IOCTL */ 57,
70         /* SMB2_CANCEL */ 4,
71         /* SMB2_ECHO */ 4,
72         /* SMB2_QUERY_DIRECTORY */ 33,
73         /* SMB2_CHANGE_NOTIFY */ 32,
74         /* SMB2_QUERY_INFO */ 41,
75         /* SMB2_SET_INFO */ 33,
76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
77 };
78
79
80 static void
81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
82                   const struct cifs_tcon *tcon)
83 {
84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
85         char *temp = (char *)hdr;
86         /* lookup word count ie StructureSize from table */
87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
88
89         /*
90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
91          * largest operations (Create)
92          */
93         memset(temp, 0, 256);
94
95         /* Note this is only network field converted to big endian */
96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
97                         - 4 /*  RFC 1001 length field itself not counted */);
98
99         hdr->ProtocolId[0] = 0xFE;
100         hdr->ProtocolId[1] = 'S';
101         hdr->ProtocolId[2] = 'M';
102         hdr->ProtocolId[3] = 'B';
103         hdr->StructureSize = cpu_to_le16(64);
104         hdr->Command = smb2_cmd;
105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
107
108         if (!tcon)
109                 goto out;
110
111         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
112         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
113         if ((tcon->ses) && (tcon->ses->server) &&
114             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
115                 hdr->CreditCharge = cpu_to_le16(1);
116         /* else CreditCharge MBZ */
117
118         hdr->TreeId = tcon->tid;
119         /* Uid is not converted */
120         if (tcon->ses)
121                 hdr->SessionId = tcon->ses->Suid;
122
123         /*
124          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
125          * to pass the path on the Open SMB prefixed by \\server\share.
126          * Not sure when we would need to do the augmented path (if ever) and
127          * setting this flag breaks the SMB2 open operation since it is
128          * illegal to send an empty path name (without \\server\share prefix)
129          * when the DFS flag is set in the SMB open header. We could
130          * consider setting the flag on all operations other than open
131          * but it is safer to net set it for now.
132          */
133 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
134                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
135
136         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
137                 hdr->Flags |= SMB2_FLAGS_SIGNED;
138 out:
139         pdu->StructureSize2 = cpu_to_le16(parmsize);
140         return;
141 }
142
143 static int
144 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
145 {
146         int rc = 0;
147         struct nls_table *nls_codepage;
148         struct cifs_ses *ses;
149         struct TCP_Server_Info *server;
150
151         /*
152          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
153          * check for tcp and smb session status done differently
154          * for those three - in the calling routine.
155          */
156         if (tcon == NULL)
157                 return rc;
158
159         if (smb2_command == SMB2_TREE_CONNECT)
160                 return rc;
161
162         if (tcon->tidStatus == CifsExiting) {
163                 /*
164                  * only tree disconnect, open, and write,
165                  * (and ulogoff which does not have tcon)
166                  * are allowed as we start force umount.
167                  */
168                 if ((smb2_command != SMB2_WRITE) &&
169                    (smb2_command != SMB2_CREATE) &&
170                    (smb2_command != SMB2_TREE_DISCONNECT)) {
171                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
172                                  smb2_command);
173                         return -ENODEV;
174                 }
175         }
176         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
177             (!tcon->ses->server))
178                 return -EIO;
179
180         ses = tcon->ses;
181         server = ses->server;
182
183         /*
184          * Give demultiplex thread up to 10 seconds to reconnect, should be
185          * greater than cifs socket timeout which is 7 seconds
186          */
187         while (server->tcpStatus == CifsNeedReconnect) {
188                 /*
189                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
190                  * here since they are implicitly done when session drops.
191                  */
192                 switch (smb2_command) {
193                 /*
194                  * BB Should we keep oplock break and add flush to exceptions?
195                  */
196                 case SMB2_TREE_DISCONNECT:
197                 case SMB2_CANCEL:
198                 case SMB2_CLOSE:
199                 case SMB2_OPLOCK_BREAK:
200                         return -EAGAIN;
201                 }
202
203                 wait_event_interruptible_timeout(server->response_q,
204                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
205
206                 /* are we still trying to reconnect? */
207                 if (server->tcpStatus != CifsNeedReconnect)
208                         break;
209
210                 /*
211                  * on "soft" mounts we wait once. Hard mounts keep
212                  * retrying until process is killed or server comes
213                  * back on-line
214                  */
215                 if (!tcon->retry) {
216                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
217                         return -EHOSTDOWN;
218                 }
219         }
220
221         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
222                 return rc;
223
224         nls_codepage = load_nls_default();
225
226         /*
227          * need to prevent multiple threads trying to simultaneously reconnect
228          * the same SMB session
229          */
230         mutex_lock(&tcon->ses->session_mutex);
231         rc = cifs_negotiate_protocol(0, tcon->ses);
232         if (!rc && tcon->ses->need_reconnect)
233                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
234
235         if (rc || !tcon->need_reconnect) {
236                 mutex_unlock(&tcon->ses->session_mutex);
237                 goto out;
238         }
239
240         cifs_mark_open_files_invalid(tcon);
241         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
242         mutex_unlock(&tcon->ses->session_mutex);
243         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
244         if (rc)
245                 goto out;
246         atomic_inc(&tconInfoReconnectCount);
247 out:
248         /*
249          * Check if handle based operation so we know whether we can continue
250          * or not without returning to caller to reset file handle.
251          */
252         /*
253          * BB Is flush done by server on drop of tcp session? Should we special
254          * case it and skip above?
255          */
256         switch (smb2_command) {
257         case SMB2_FLUSH:
258         case SMB2_READ:
259         case SMB2_WRITE:
260         case SMB2_LOCK:
261         case SMB2_IOCTL:
262         case SMB2_QUERY_DIRECTORY:
263         case SMB2_CHANGE_NOTIFY:
264         case SMB2_QUERY_INFO:
265         case SMB2_SET_INFO:
266                 return -EAGAIN;
267         }
268         unload_nls(nls_codepage);
269         return rc;
270 }
271
272 /*
273  * Allocate and return pointer to an SMB request hdr, and set basic
274  * SMB information in the SMB header. If the return code is zero, this
275  * function must have filled in request_buf pointer.
276  */
277 static int
278 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
279                 void **request_buf)
280 {
281         int rc = 0;
282
283         rc = smb2_reconnect(smb2_command, tcon);
284         if (rc)
285                 return rc;
286
287         /* BB eventually switch this to SMB2 specific small buf size */
288         *request_buf = cifs_small_buf_get();
289         if (*request_buf == NULL) {
290                 /* BB should we add a retry in here if not a writepage? */
291                 return -ENOMEM;
292         }
293
294         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
295
296         if (tcon != NULL) {
297 #ifdef CONFIG_CIFS_STATS2
298                 uint16_t com_code = le16_to_cpu(smb2_command);
299                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
300 #endif
301                 cifs_stats_inc(&tcon->num_smbs_sent);
302         }
303
304         return rc;
305 }
306
307 /*
308  *
309  *      SMB2 Worker functions follow:
310  *
311  *      The general structure of the worker functions is:
312  *      1) Call smb2_init (assembles SMB2 header)
313  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
314  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
315  *      4) Decode SMB2 command specific fields in the fixed length area
316  *      5) Decode variable length data area (if any for this SMB2 command type)
317  *      6) Call free smb buffer
318  *      7) return
319  *
320  */
321
322 int
323 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
324 {
325         struct smb2_negotiate_req *req;
326         struct smb2_negotiate_rsp *rsp;
327         struct kvec iov[1];
328         int rc = 0;
329         int resp_buftype;
330         struct TCP_Server_Info *server = ses->server;
331         int blob_offset, blob_length;
332         char *security_blob;
333         int flags = CIFS_NEG_OP;
334
335         cifs_dbg(FYI, "Negotiate protocol\n");
336
337         if (!server) {
338                 WARN(1, "%s: server is NULL!\n", __func__);
339                 return -EIO;
340         }
341
342         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
343         if (rc)
344                 return rc;
345
346         req->hdr.SessionId = 0;
347
348         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
349
350         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
351         inc_rfc1001_len(req, 2);
352
353         /* only one of SMB2 signing flags may be set in SMB2 request */
354         if (ses->sign)
355                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
356         else if (global_secflags & CIFSSEC_MAY_SIGN)
357                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
358         else
359                 req->SecurityMode = 0;
360
361         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
362
363         /* ClientGUID must be zero for SMB2.02 dialect */
364         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
365                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
366         else
367                 memcpy(req->ClientGUID, server->client_guid,
368                         SMB2_CLIENT_GUID_SIZE);
369
370         iov[0].iov_base = (char *)req;
371         /* 4 for rfc1002 length field */
372         iov[0].iov_len = get_rfc1002_length(req) + 4;
373
374         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
375
376         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
377         /*
378          * No tcon so can't do
379          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
380          */
381         if (rc != 0)
382                 goto neg_exit;
383
384         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
385
386         /* BB we may eventually want to match the negotiated vs. requested
387            dialect, even though we are only requesting one at a time */
388         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
389                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
390         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
391                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
392         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
393                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
394         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
395                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
396         else {
397                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
398                          le16_to_cpu(rsp->DialectRevision));
399                 rc = -EIO;
400                 goto neg_exit;
401         }
402         server->dialect = le16_to_cpu(rsp->DialectRevision);
403
404         /* SMB2 only has an extended negflavor */
405         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
406         /* set it to the maximum buffer size value we can send with 1 credit */
407         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
408                                SMB2_MAX_BUFFER_SIZE);
409         server->max_read = le32_to_cpu(rsp->MaxReadSize);
410         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
411         /* BB Do we need to validate the SecurityMode? */
412         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
413         server->capabilities = le32_to_cpu(rsp->Capabilities);
414         /* Internal types */
415         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
416
417         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
418                                                &rsp->hdr);
419         /*
420          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
421          * for us will be
422          *      ses->sectype = RawNTLMSSP;
423          * but for time being this is our only auth choice so doesn't matter.
424          * We just found a server which sets blob length to zero expecting raw.
425          */
426         if (blob_length == 0)
427                 cifs_dbg(FYI, "missing security blob on negprot\n");
428
429         rc = cifs_enable_signing(server, ses->sign);
430 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
431         if (rc)
432                 goto neg_exit;
433         if (blob_length)
434                 rc = decode_negTokenInit(security_blob, blob_length, server);
435         if (rc == 1)
436                 rc = 0;
437         else if (rc == 0) {
438                 rc = -EIO;
439                 goto neg_exit;
440         }
441 #endif
442
443 neg_exit:
444         free_rsp_buf(resp_buftype, rsp);
445         return rc;
446 }
447
448 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
449 {
450         int rc = 0;
451         struct validate_negotiate_info_req vneg_inbuf;
452         struct validate_negotiate_info_rsp *pneg_rsp;
453         u32 rsplen;
454
455         cifs_dbg(FYI, "validate negotiate\n");
456
457         /*
458          * validation ioctl must be signed, so no point sending this if we
459          * can not sign it.  We could eventually change this to selectively
460          * sign just this, the first and only signed request on a connection.
461          * This is good enough for now since a user who wants better security
462          * would also enable signing on the mount. Having validation of
463          * negotiate info for signed connections helps reduce attack vectors
464          */
465         if (tcon->ses->server->sign == false)
466                 return 0; /* validation requires signing */
467
468         vneg_inbuf.Capabilities =
469                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
470         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
471                                         SMB2_CLIENT_GUID_SIZE);
472
473         if (tcon->ses->sign)
474                 vneg_inbuf.SecurityMode =
475                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
476         else if (global_secflags & CIFSSEC_MAY_SIGN)
477                 vneg_inbuf.SecurityMode =
478                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
479         else
480                 vneg_inbuf.SecurityMode = 0;
481
482         vneg_inbuf.DialectCount = cpu_to_le16(1);
483         vneg_inbuf.Dialects[0] =
484                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
485
486         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
487                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
488                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
489                 (char **)&pneg_rsp, &rsplen);
490
491         if (rc != 0) {
492                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
493                 return -EIO;
494         }
495
496         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
497                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
498                 return -EIO;
499         }
500
501         /* check validate negotiate info response matches what we got earlier */
502         if (pneg_rsp->Dialect !=
503                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
504                 goto vneg_out;
505
506         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
507                 goto vneg_out;
508
509         /* do not validate server guid because not saved at negprot time yet */
510
511         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
512               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
513                 goto vneg_out;
514
515         /* validate negotiate successful */
516         cifs_dbg(FYI, "validate negotiate info successful\n");
517         return 0;
518
519 vneg_out:
520         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
521         return -EIO;
522 }
523
524 int
525 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
526                 const struct nls_table *nls_cp)
527 {
528         struct smb2_sess_setup_req *req;
529         struct smb2_sess_setup_rsp *rsp = NULL;
530         struct kvec iov[2];
531         int rc = 0;
532         int resp_buftype = CIFS_NO_BUFFER;
533         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
534         struct TCP_Server_Info *server = ses->server;
535         u16 blob_length = 0;
536         char *security_blob;
537         char *ntlmssp_blob = NULL;
538         bool use_spnego = false; /* else use raw ntlmssp */
539
540         cifs_dbg(FYI, "Session Setup\n");
541
542         if (!server) {
543                 WARN(1, "%s: server is NULL!\n", __func__);
544                 return -EIO;
545         }
546
547         /*
548          * If we are here due to reconnect, free per-smb session key
549          * in case signing was required.
550          */
551         kfree(ses->auth_key.response);
552         ses->auth_key.response = NULL;
553
554         /*
555          * If memory allocation is successful, caller of this function
556          * frees it.
557          */
558         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
559         if (!ses->ntlmssp)
560                 return -ENOMEM;
561         ses->ntlmssp->sesskey_per_smbsess = true;
562
563         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
564         ses->sectype = RawNTLMSSP;
565
566 ssetup_ntlmssp_authenticate:
567         if (phase == NtLmChallenge)
568                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
569
570         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
571         if (rc)
572                 return rc;
573
574         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
575         req->VcNumber = 0; /* MBZ */
576         /* to enable echos and oplocks */
577         req->hdr.CreditRequest = cpu_to_le16(3);
578
579         /* only one of SMB2 signing flags may be set in SMB2 request */
580         if (server->sign)
581                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
582         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
583                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
584         else
585                 req->SecurityMode = 0;
586
587         req->Capabilities = 0;
588         req->Channel = 0; /* MBZ */
589
590         iov[0].iov_base = (char *)req;
591         /* 4 for rfc1002 length field and 1 for pad */
592         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
593         if (phase == NtLmNegotiate) {
594                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
595                                        GFP_KERNEL);
596                 if (ntlmssp_blob == NULL) {
597                         rc = -ENOMEM;
598                         goto ssetup_exit;
599                 }
600                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
601                 if (use_spnego) {
602                         /* blob_length = build_spnego_ntlmssp_blob(
603                                         &security_blob,
604                                         sizeof(struct _NEGOTIATE_MESSAGE),
605                                         ntlmssp_blob); */
606                         /* BB eventually need to add this */
607                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
608                         rc = -EOPNOTSUPP;
609                         kfree(ntlmssp_blob);
610                         goto ssetup_exit;
611                 } else {
612                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
613                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
614                         security_blob = ntlmssp_blob;
615                 }
616         } else if (phase == NtLmAuthenticate) {
617                 req->hdr.SessionId = ses->Suid;
618                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
619                                        GFP_KERNEL);
620                 if (ntlmssp_blob == NULL) {
621                         rc = -ENOMEM;
622                         goto ssetup_exit;
623                 }
624                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
625                                              nls_cp);
626                 if (rc) {
627                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
628                                  rc);
629                         goto ssetup_exit; /* BB double check error handling */
630                 }
631                 if (use_spnego) {
632                         /* blob_length = build_spnego_ntlmssp_blob(
633                                                         &security_blob,
634                                                         blob_length,
635                                                         ntlmssp_blob); */
636                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
637                         rc = -EOPNOTSUPP;
638                         kfree(ntlmssp_blob);
639                         goto ssetup_exit;
640                 } else {
641                         security_blob = ntlmssp_blob;
642                 }
643         } else {
644                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
645                 rc = -EIO;
646                 goto ssetup_exit;
647         }
648
649         /* Testing shows that buffer offset must be at location of Buffer[0] */
650         req->SecurityBufferOffset =
651                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
652                                             1 /* pad */ - 4 /* rfc1001 len */);
653         req->SecurityBufferLength = cpu_to_le16(blob_length);
654         iov[1].iov_base = security_blob;
655         iov[1].iov_len = blob_length;
656
657         inc_rfc1001_len(req, blob_length - 1 /* pad */);
658
659         /* BB add code to build os and lm fields */
660
661         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
662                           CIFS_LOG_ERROR | CIFS_NEG_OP);
663
664         kfree(security_blob);
665         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
666         if (resp_buftype != CIFS_NO_BUFFER &&
667             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
668                 if (phase != NtLmNegotiate) {
669                         cifs_dbg(VFS, "Unexpected more processing error\n");
670                         goto ssetup_exit;
671                 }
672                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
673                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
674                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
675                                  le16_to_cpu(rsp->SecurityBufferOffset));
676                         rc = -EIO;
677                         goto ssetup_exit;
678                 }
679
680                 /* NTLMSSP Negotiate sent now processing challenge (response) */
681                 phase = NtLmChallenge; /* process ntlmssp challenge */
682                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
683                 ses->Suid = rsp->hdr.SessionId;
684                 rc = decode_ntlmssp_challenge(rsp->Buffer,
685                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
686         }
687
688         /*
689          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
690          * but at least the raw NTLMSSP case works.
691          */
692         /*
693          * No tcon so can't do
694          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
695          */
696         if (rc != 0)
697                 goto ssetup_exit;
698
699         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
700         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
701                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
702 ssetup_exit:
703         free_rsp_buf(resp_buftype, rsp);
704
705         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
706         if ((phase == NtLmChallenge) && (rc == 0))
707                 goto ssetup_ntlmssp_authenticate;
708
709         if (!rc) {
710                 mutex_lock(&server->srv_mutex);
711                 if (server->sign && server->ops->generate_signingkey) {
712                         rc = server->ops->generate_signingkey(ses);
713                         kfree(ses->auth_key.response);
714                         ses->auth_key.response = NULL;
715                         if (rc) {
716                                 cifs_dbg(FYI,
717                                         "SMB3 session key generation failed\n");
718                                 mutex_unlock(&server->srv_mutex);
719                                 goto keygen_exit;
720                         }
721                 }
722                 if (!server->session_estab) {
723                         server->sequence_number = 0x2;
724                         server->session_estab = true;
725                 }
726                 mutex_unlock(&server->srv_mutex);
727
728                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
729                 spin_lock(&GlobalMid_Lock);
730                 ses->status = CifsGood;
731                 ses->need_reconnect = false;
732                 spin_unlock(&GlobalMid_Lock);
733         }
734
735 keygen_exit:
736         if (!server->sign) {
737                 kfree(ses->auth_key.response);
738                 ses->auth_key.response = NULL;
739         }
740         kfree(ses->ntlmssp);
741
742         return rc;
743 }
744
745 int
746 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
747 {
748         struct smb2_logoff_req *req; /* response is also trivial struct */
749         int rc = 0;
750         struct TCP_Server_Info *server;
751
752         cifs_dbg(FYI, "disconnect session %p\n", ses);
753
754         if (ses && (ses->server))
755                 server = ses->server;
756         else
757                 return -EIO;
758
759         /* no need to send SMB logoff if uid already closed due to reconnect */
760         if (ses->need_reconnect)
761                 goto smb2_session_already_dead;
762
763         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
764         if (rc)
765                 return rc;
766
767          /* since no tcon, smb2_init can not do this, so do here */
768         req->hdr.SessionId = ses->Suid;
769         if (server->sign)
770                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
771
772         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
773         /*
774          * No tcon so can't do
775          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
776          */
777
778 smb2_session_already_dead:
779         return rc;
780 }
781
782 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
783 {
784         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
785 }
786
787 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
788
789 /* These are similar values to what Windows uses */
790 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
791 {
792         tcon->max_chunks = 256;
793         tcon->max_bytes_chunk = 1048576;
794         tcon->max_bytes_copy = 16777216;
795 }
796
797 int
798 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
799           struct cifs_tcon *tcon, const struct nls_table *cp)
800 {
801         struct smb2_tree_connect_req *req;
802         struct smb2_tree_connect_rsp *rsp = NULL;
803         struct kvec iov[2];
804         int rc = 0;
805         int resp_buftype;
806         int unc_path_len;
807         struct TCP_Server_Info *server;
808         __le16 *unc_path = NULL;
809
810         cifs_dbg(FYI, "TCON\n");
811
812         if ((ses->server) && tree)
813                 server = ses->server;
814         else
815                 return -EIO;
816
817         if (tcon && tcon->bad_network_name)
818                 return -ENOENT;
819
820         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
821         if (unc_path == NULL)
822                 return -ENOMEM;
823
824         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
825         unc_path_len *= 2;
826         if (unc_path_len < 2) {
827                 kfree(unc_path);
828                 return -EINVAL;
829         }
830
831         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
832         if (rc) {
833                 kfree(unc_path);
834                 return rc;
835         }
836
837         if (tcon == NULL) {
838                 /* since no tcon, smb2_init can not do this, so do here */
839                 req->hdr.SessionId = ses->Suid;
840                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
841                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
842         }
843
844         iov[0].iov_base = (char *)req;
845         /* 4 for rfc1002 length field and 1 for pad */
846         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
847
848         /* Testing shows that buffer offset must be at location of Buffer[0] */
849         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
850                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
851         req->PathLength = cpu_to_le16(unc_path_len - 2);
852         iov[1].iov_base = unc_path;
853         iov[1].iov_len = unc_path_len;
854
855         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
856
857         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
858         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
859
860         if (rc != 0) {
861                 if (tcon) {
862                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
863                         tcon->need_reconnect = true;
864                 }
865                 goto tcon_error_exit;
866         }
867
868         if (tcon == NULL) {
869                 ses->ipc_tid = rsp->hdr.TreeId;
870                 goto tcon_exit;
871         }
872
873         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
874                 cifs_dbg(FYI, "connection to disk share\n");
875         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
876                 tcon->ipc = true;
877                 cifs_dbg(FYI, "connection to pipe share\n");
878         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
879                 tcon->print = true;
880                 cifs_dbg(FYI, "connection to printer\n");
881         } else {
882                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
883                 rc = -EOPNOTSUPP;
884                 goto tcon_error_exit;
885         }
886
887         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
888         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
889         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
890         tcon->tidStatus = CifsGood;
891         tcon->need_reconnect = false;
892         tcon->tid = rsp->hdr.TreeId;
893         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
894
895         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
896             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
897                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
898         init_copy_chunk_defaults(tcon);
899         if (tcon->ses->server->ops->validate_negotiate)
900                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
901 tcon_exit:
902         free_rsp_buf(resp_buftype, rsp);
903         kfree(unc_path);
904         return rc;
905
906 tcon_error_exit:
907         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
908                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
909                 if (tcon)
910                         tcon->bad_network_name = true;
911         }
912         goto tcon_exit;
913 }
914
915 int
916 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
917 {
918         struct smb2_tree_disconnect_req *req; /* response is trivial */
919         int rc = 0;
920         struct TCP_Server_Info *server;
921         struct cifs_ses *ses = tcon->ses;
922
923         cifs_dbg(FYI, "Tree Disconnect\n");
924
925         if (ses && (ses->server))
926                 server = ses->server;
927         else
928                 return -EIO;
929
930         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
931                 return 0;
932
933         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
934         if (rc)
935                 return rc;
936
937         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
938         if (rc)
939                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
940
941         return rc;
942 }
943
944
945 static struct create_durable *
946 create_durable_buf(void)
947 {
948         struct create_durable *buf;
949
950         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
951         if (!buf)
952                 return NULL;
953
954         buf->ccontext.DataOffset = cpu_to_le16(offsetof
955                                         (struct create_durable, Data));
956         buf->ccontext.DataLength = cpu_to_le32(16);
957         buf->ccontext.NameOffset = cpu_to_le16(offsetof
958                                 (struct create_durable, Name));
959         buf->ccontext.NameLength = cpu_to_le16(4);
960         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
961         buf->Name[0] = 'D';
962         buf->Name[1] = 'H';
963         buf->Name[2] = 'n';
964         buf->Name[3] = 'Q';
965         return buf;
966 }
967
968 static struct create_durable *
969 create_reconnect_durable_buf(struct cifs_fid *fid)
970 {
971         struct create_durable *buf;
972
973         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
974         if (!buf)
975                 return NULL;
976
977         buf->ccontext.DataOffset = cpu_to_le16(offsetof
978                                         (struct create_durable, Data));
979         buf->ccontext.DataLength = cpu_to_le32(16);
980         buf->ccontext.NameOffset = cpu_to_le16(offsetof
981                                 (struct create_durable, Name));
982         buf->ccontext.NameLength = cpu_to_le16(4);
983         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
984         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
985         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
986         buf->Name[0] = 'D';
987         buf->Name[1] = 'H';
988         buf->Name[2] = 'n';
989         buf->Name[3] = 'C';
990         return buf;
991 }
992
993 static __u8
994 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
995                   unsigned int *epoch)
996 {
997         char *data_offset;
998         struct create_context *cc;
999         unsigned int next = 0;
1000         char *name;
1001
1002         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1003         cc = (struct create_context *)data_offset;
1004         do {
1005                 cc = (struct create_context *)((char *)cc + next);
1006                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1007                 if (le16_to_cpu(cc->NameLength) != 4 ||
1008                     strncmp(name, "RqLs", 4)) {
1009                         next = le32_to_cpu(cc->Next);
1010                         continue;
1011                 }
1012                 return server->ops->parse_lease_buf(cc, epoch);
1013         } while (next != 0);
1014
1015         return 0;
1016 }
1017
1018 static int
1019 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1020                   unsigned int *num_iovec, __u8 *oplock)
1021 {
1022         struct smb2_create_req *req = iov[0].iov_base;
1023         unsigned int num = *num_iovec;
1024
1025         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1026         if (iov[num].iov_base == NULL)
1027                 return -ENOMEM;
1028         iov[num].iov_len = server->vals->create_lease_size;
1029         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1030         if (!req->CreateContextsOffset)
1031                 req->CreateContextsOffset = cpu_to_le32(
1032                                 sizeof(struct smb2_create_req) - 4 +
1033                                 iov[num - 1].iov_len);
1034         le32_add_cpu(&req->CreateContextsLength,
1035                      server->vals->create_lease_size);
1036         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1037         *num_iovec = num + 1;
1038         return 0;
1039 }
1040
1041 static int
1042 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1043                     struct cifs_open_parms *oparms)
1044 {
1045         struct smb2_create_req *req = iov[0].iov_base;
1046         unsigned int num = *num_iovec;
1047
1048         if (oparms->reconnect) {
1049                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1050                 /* indicate that we don't need to relock the file */
1051                 oparms->reconnect = false;
1052         } else
1053                 iov[num].iov_base = create_durable_buf();
1054         if (iov[num].iov_base == NULL)
1055                 return -ENOMEM;
1056         iov[num].iov_len = sizeof(struct create_durable);
1057         if (!req->CreateContextsOffset)
1058                 req->CreateContextsOffset =
1059                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1060                                                                 iov[1].iov_len);
1061         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1062         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1063         *num_iovec = num + 1;
1064         return 0;
1065 }
1066
1067 int
1068 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1069           __u8 *oplock, struct smb2_file_all_info *buf,
1070           struct smb2_err_rsp **err_buf)
1071 {
1072         struct smb2_create_req *req;
1073         struct smb2_create_rsp *rsp;
1074         struct TCP_Server_Info *server;
1075         struct cifs_tcon *tcon = oparms->tcon;
1076         struct cifs_ses *ses = tcon->ses;
1077         struct kvec iov[4];
1078         int resp_buftype;
1079         int uni_path_len;
1080         __le16 *copy_path = NULL;
1081         int copy_size;
1082         int rc = 0;
1083         unsigned int num_iovecs = 2;
1084         __u32 file_attributes = 0;
1085         char *dhc_buf = NULL, *lc_buf = NULL;
1086
1087         cifs_dbg(FYI, "create/open\n");
1088
1089         if (ses && (ses->server))
1090                 server = ses->server;
1091         else
1092                 return -EIO;
1093
1094         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1095         if (rc)
1096                 return rc;
1097
1098         if (oparms->create_options & CREATE_OPTION_READONLY)
1099                 file_attributes |= ATTR_READONLY;
1100         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1101                 file_attributes |= ATTR_SYSTEM;
1102
1103         req->ImpersonationLevel = IL_IMPERSONATION;
1104         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1105         /* File attributes ignored on open (used in create though) */
1106         req->FileAttributes = cpu_to_le32(file_attributes);
1107         req->ShareAccess = FILE_SHARE_ALL_LE;
1108         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1109         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1110         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1111         /* do not count rfc1001 len field */
1112         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1113
1114         iov[0].iov_base = (char *)req;
1115         /* 4 for rfc1002 length field */
1116         iov[0].iov_len = get_rfc1002_length(req) + 4;
1117
1118         /* MUST set path len (NameLength) to 0 opening root of share */
1119         req->NameLength = cpu_to_le16(uni_path_len - 2);
1120         /* -1 since last byte is buf[0] which is sent below (path) */
1121         iov[0].iov_len--;
1122         if (uni_path_len % 8 != 0) {
1123                 copy_size = uni_path_len / 8 * 8;
1124                 if (copy_size < uni_path_len)
1125                         copy_size += 8;
1126
1127                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1128                 if (!copy_path)
1129                         return -ENOMEM;
1130                 memcpy((char *)copy_path, (const char *)path,
1131                         uni_path_len);
1132                 uni_path_len = copy_size;
1133                 path = copy_path;
1134         }
1135
1136         iov[1].iov_len = uni_path_len;
1137         iov[1].iov_base = path;
1138         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1139         inc_rfc1001_len(req, uni_path_len - 1);
1140
1141         if (!server->oplocks)
1142                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1143
1144         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1145             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1146                 req->RequestedOplockLevel = *oplock;
1147         else {
1148                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1149                 if (rc) {
1150                         cifs_small_buf_release(req);
1151                         kfree(copy_path);
1152                         return rc;
1153                 }
1154                 lc_buf = iov[num_iovecs-1].iov_base;
1155         }
1156
1157         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1158                 /* need to set Next field of lease context if we request it */
1159                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1160                         struct create_context *ccontext =
1161                             (struct create_context *)iov[num_iovecs-1].iov_base;
1162                         ccontext->Next =
1163                                 cpu_to_le32(server->vals->create_lease_size);
1164                 }
1165                 rc = add_durable_context(iov, &num_iovecs, oparms);
1166                 if (rc) {
1167                         cifs_small_buf_release(req);
1168                         kfree(copy_path);
1169                         kfree(lc_buf);
1170                         return rc;
1171                 }
1172                 dhc_buf = iov[num_iovecs-1].iov_base;
1173         }
1174
1175         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1176         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1177
1178         if (rc != 0) {
1179                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1180                 if (err_buf)
1181                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1182                                            GFP_KERNEL);
1183                 goto creat_exit;
1184         }
1185
1186         oparms->fid->persistent_fid = rsp->PersistentFileId;
1187         oparms->fid->volatile_fid = rsp->VolatileFileId;
1188
1189         if (buf) {
1190                 memcpy(buf, &rsp->CreationTime, 32);
1191                 buf->AllocationSize = rsp->AllocationSize;
1192                 buf->EndOfFile = rsp->EndofFile;
1193                 buf->Attributes = rsp->FileAttributes;
1194                 buf->NumberOfLinks = cpu_to_le32(1);
1195                 buf->DeletePending = 0;
1196         }
1197
1198         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1199                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1200         else
1201                 *oplock = rsp->OplockLevel;
1202 creat_exit:
1203         kfree(copy_path);
1204         kfree(lc_buf);
1205         kfree(dhc_buf);
1206         free_rsp_buf(resp_buftype, rsp);
1207         return rc;
1208 }
1209
1210 /*
1211  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1212  */
1213 int
1214 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1215            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1216            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1217 {
1218         struct smb2_ioctl_req *req;
1219         struct smb2_ioctl_rsp *rsp;
1220         struct TCP_Server_Info *server;
1221         struct cifs_ses *ses;
1222         struct kvec iov[2];
1223         int resp_buftype;
1224         int num_iovecs;
1225         int rc = 0;
1226
1227         cifs_dbg(FYI, "SMB2 IOCTL\n");
1228
1229         if (out_data != NULL)
1230                 *out_data = NULL;
1231
1232         /* zero out returned data len, in case of error */
1233         if (plen)
1234                 *plen = 0;
1235
1236         if (tcon)
1237                 ses = tcon->ses;
1238         else
1239                 return -EIO;
1240
1241         if (ses && (ses->server))
1242                 server = ses->server;
1243         else
1244                 return -EIO;
1245
1246         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1247         if (rc)
1248                 return rc;
1249
1250         req->CtlCode = cpu_to_le32(opcode);
1251         req->PersistentFileId = persistent_fid;
1252         req->VolatileFileId = volatile_fid;
1253
1254         if (indatalen) {
1255                 req->InputCount = cpu_to_le32(indatalen);
1256                 /* do not set InputOffset if no input data */
1257                 req->InputOffset =
1258                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1259                 iov[1].iov_base = in_data;
1260                 iov[1].iov_len = indatalen;
1261                 num_iovecs = 2;
1262         } else
1263                 num_iovecs = 1;
1264
1265         req->OutputOffset = 0;
1266         req->OutputCount = 0; /* MBZ */
1267
1268         /*
1269          * Could increase MaxOutputResponse, but that would require more
1270          * than one credit. Windows typically sets this smaller, but for some
1271          * ioctls it may be useful to allow server to send more. No point
1272          * limiting what the server can send as long as fits in one credit
1273          */
1274         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1275
1276         if (is_fsctl)
1277                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1278         else
1279                 req->Flags = 0;
1280
1281         iov[0].iov_base = (char *)req;
1282
1283         /*
1284          * If no input data, the size of ioctl struct in
1285          * protocol spec still includes a 1 byte data buffer,
1286          * but if input data passed to ioctl, we do not
1287          * want to double count this, so we do not send
1288          * the dummy one byte of data in iovec[0] if sending
1289          * input data (in iovec[1]). We also must add 4 bytes
1290          * in first iovec to allow for rfc1002 length field.
1291          */
1292
1293         if (indatalen) {
1294                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1295                 inc_rfc1001_len(req, indatalen - 1);
1296         } else
1297                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1298
1299
1300         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1301         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1302
1303         if ((rc != 0) && (rc != -EINVAL)) {
1304                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1305                 goto ioctl_exit;
1306         } else if (rc == -EINVAL) {
1307                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1308                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1309                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1310                         goto ioctl_exit;
1311                 }
1312         }
1313
1314         /* check if caller wants to look at return data or just return rc */
1315         if ((plen == NULL) || (out_data == NULL))
1316                 goto ioctl_exit;
1317
1318         *plen = le32_to_cpu(rsp->OutputCount);
1319
1320         /* We check for obvious errors in the output buffer length and offset */
1321         if (*plen == 0)
1322                 goto ioctl_exit; /* server returned no data */
1323         else if (*plen > 0xFF00) {
1324                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1325                 *plen = 0;
1326                 rc = -EIO;
1327                 goto ioctl_exit;
1328         }
1329
1330         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1331                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1332                         le32_to_cpu(rsp->OutputOffset));
1333                 *plen = 0;
1334                 rc = -EIO;
1335                 goto ioctl_exit;
1336         }
1337
1338         *out_data = kmalloc(*plen, GFP_KERNEL);
1339         if (*out_data == NULL) {
1340                 rc = -ENOMEM;
1341                 goto ioctl_exit;
1342         }
1343
1344         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1345                *plen);
1346 ioctl_exit:
1347         free_rsp_buf(resp_buftype, rsp);
1348         return rc;
1349 }
1350
1351 /*
1352  *   Individual callers to ioctl worker function follow
1353  */
1354
1355 int
1356 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1357                      u64 persistent_fid, u64 volatile_fid)
1358 {
1359         int rc;
1360         struct  compress_ioctl fsctl_input;
1361         char *ret_data = NULL;
1362
1363         fsctl_input.CompressionState =
1364                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1365
1366         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1367                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1368                         (char *)&fsctl_input /* data input */,
1369                         2 /* in data len */, &ret_data /* out data */, NULL);
1370
1371         cifs_dbg(FYI, "set compression rc %d\n", rc);
1372
1373         return rc;
1374 }
1375
1376 int
1377 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1378            u64 persistent_fid, u64 volatile_fid)
1379 {
1380         struct smb2_close_req *req;
1381         struct smb2_close_rsp *rsp;
1382         struct TCP_Server_Info *server;
1383         struct cifs_ses *ses = tcon->ses;
1384         struct kvec iov[1];
1385         int resp_buftype;
1386         int rc = 0;
1387
1388         cifs_dbg(FYI, "Close\n");
1389
1390         if (ses && (ses->server))
1391                 server = ses->server;
1392         else
1393                 return -EIO;
1394
1395         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1396         if (rc)
1397                 return rc;
1398
1399         req->PersistentFileId = persistent_fid;
1400         req->VolatileFileId = volatile_fid;
1401
1402         iov[0].iov_base = (char *)req;
1403         /* 4 for rfc1002 length field */
1404         iov[0].iov_len = get_rfc1002_length(req) + 4;
1405
1406         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1407         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1408
1409         if (rc != 0) {
1410                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1411                 goto close_exit;
1412         }
1413
1414         /* BB FIXME - decode close response, update inode for caching */
1415
1416 close_exit:
1417         free_rsp_buf(resp_buftype, rsp);
1418         return rc;
1419 }
1420
1421 static int
1422 validate_buf(unsigned int offset, unsigned int buffer_length,
1423              struct smb2_hdr *hdr, unsigned int min_buf_size)
1424
1425 {
1426         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1427         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1428         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1429         char *end_of_buf = begin_of_buf + buffer_length;
1430
1431
1432         if (buffer_length < min_buf_size) {
1433                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1434                          buffer_length, min_buf_size);
1435                 return -EINVAL;
1436         }
1437
1438         /* check if beyond RFC1001 maximum length */
1439         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1440                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1441                          buffer_length, smb_len);
1442                 return -EINVAL;
1443         }
1444
1445         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1446                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1447                 return -EINVAL;
1448         }
1449
1450         return 0;
1451 }
1452
1453 /*
1454  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1455  * Caller must free buffer.
1456  */
1457 static int
1458 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1459                       struct smb2_hdr *hdr, unsigned int minbufsize,
1460                       char *data)
1461
1462 {
1463         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1464         int rc;
1465
1466         if (!data)
1467                 return -EINVAL;
1468
1469         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1470         if (rc)
1471                 return rc;
1472
1473         memcpy(data, begin_of_buf, buffer_length);
1474
1475         return 0;
1476 }
1477
1478 static int
1479 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1480            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1481            size_t output_len, size_t min_len, void *data)
1482 {
1483         struct smb2_query_info_req *req;
1484         struct smb2_query_info_rsp *rsp = NULL;
1485         struct kvec iov[2];
1486         int rc = 0;
1487         int resp_buftype;
1488         struct TCP_Server_Info *server;
1489         struct cifs_ses *ses = tcon->ses;
1490
1491         cifs_dbg(FYI, "Query Info\n");
1492
1493         if (ses && (ses->server))
1494                 server = ses->server;
1495         else
1496                 return -EIO;
1497
1498         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1499         if (rc)
1500                 return rc;
1501
1502         req->InfoType = SMB2_O_INFO_FILE;
1503         req->FileInfoClass = info_class;
1504         req->PersistentFileId = persistent_fid;
1505         req->VolatileFileId = volatile_fid;
1506         /* 4 for rfc1002 length field and 1 for Buffer */
1507         req->InputBufferOffset =
1508                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1509         req->OutputBufferLength = cpu_to_le32(output_len);
1510
1511         iov[0].iov_base = (char *)req;
1512         /* 4 for rfc1002 length field */
1513         iov[0].iov_len = get_rfc1002_length(req) + 4;
1514
1515         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1516         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1517
1518         if (rc) {
1519                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1520                 goto qinf_exit;
1521         }
1522
1523         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1524                                    le32_to_cpu(rsp->OutputBufferLength),
1525                                    &rsp->hdr, min_len, data);
1526
1527 qinf_exit:
1528         free_rsp_buf(resp_buftype, rsp);
1529         return rc;
1530 }
1531
1532 int
1533 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1534                 u64 persistent_fid, u64 volatile_fid,
1535                 struct smb2_file_all_info *data)
1536 {
1537         return query_info(xid, tcon, persistent_fid, volatile_fid,
1538                           FILE_ALL_INFORMATION,
1539                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1540                           sizeof(struct smb2_file_all_info), data);
1541 }
1542
1543 int
1544 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1545                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1546 {
1547         return query_info(xid, tcon, persistent_fid, volatile_fid,
1548                           FILE_INTERNAL_INFORMATION,
1549                           sizeof(struct smb2_file_internal_info),
1550                           sizeof(struct smb2_file_internal_info), uniqueid);
1551 }
1552
1553 /*
1554  * This is a no-op for now. We're not really interested in the reply, but
1555  * rather in the fact that the server sent one and that server->lstrp
1556  * gets updated.
1557  *
1558  * FIXME: maybe we should consider checking that the reply matches request?
1559  */
1560 static void
1561 smb2_echo_callback(struct mid_q_entry *mid)
1562 {
1563         struct TCP_Server_Info *server = mid->callback_data;
1564         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1565         unsigned int credits_received = 1;
1566
1567         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1568                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1569
1570         DeleteMidQEntry(mid);
1571         add_credits(server, credits_received, CIFS_ECHO_OP);
1572 }
1573
1574 int
1575 SMB2_echo(struct TCP_Server_Info *server)
1576 {
1577         struct smb2_echo_req *req;
1578         int rc = 0;
1579         struct kvec iov;
1580         struct smb_rqst rqst = { .rq_iov = &iov,
1581                                  .rq_nvec = 1 };
1582
1583         cifs_dbg(FYI, "In echo request\n");
1584
1585         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1586         if (rc)
1587                 return rc;
1588
1589         req->hdr.CreditRequest = cpu_to_le16(1);
1590
1591         iov.iov_base = (char *)req;
1592         /* 4 for rfc1002 length field */
1593         iov.iov_len = get_rfc1002_length(req) + 4;
1594
1595         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1596                              CIFS_ECHO_OP);
1597         if (rc)
1598                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1599
1600         cifs_small_buf_release(req);
1601         return rc;
1602 }
1603
1604 int
1605 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1606            u64 volatile_fid)
1607 {
1608         struct smb2_flush_req *req;
1609         struct TCP_Server_Info *server;
1610         struct cifs_ses *ses = tcon->ses;
1611         struct kvec iov[1];
1612         int resp_buftype;
1613         int rc = 0;
1614
1615         cifs_dbg(FYI, "Flush\n");
1616
1617         if (ses && (ses->server))
1618                 server = ses->server;
1619         else
1620                 return -EIO;
1621
1622         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1623         if (rc)
1624                 return rc;
1625
1626         req->PersistentFileId = persistent_fid;
1627         req->VolatileFileId = volatile_fid;
1628
1629         iov[0].iov_base = (char *)req;
1630         /* 4 for rfc1002 length field */
1631         iov[0].iov_len = get_rfc1002_length(req) + 4;
1632
1633         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1634
1635         if (rc != 0)
1636                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1637
1638         free_rsp_buf(resp_buftype, iov[0].iov_base);
1639         return rc;
1640 }
1641
1642 /*
1643  * To form a chain of read requests, any read requests after the first should
1644  * have the end_of_chain boolean set to true.
1645  */
1646 static int
1647 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1648                   unsigned int remaining_bytes, int request_type)
1649 {
1650         int rc = -EACCES;
1651         struct smb2_read_req *req = NULL;
1652
1653         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1654         if (rc)
1655                 return rc;
1656         if (io_parms->tcon->ses->server == NULL)
1657                 return -ECONNABORTED;
1658
1659         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1660
1661         req->PersistentFileId = io_parms->persistent_fid;
1662         req->VolatileFileId = io_parms->volatile_fid;
1663         req->ReadChannelInfoOffset = 0; /* reserved */
1664         req->ReadChannelInfoLength = 0; /* reserved */
1665         req->Channel = 0; /* reserved */
1666         req->MinimumCount = 0;
1667         req->Length = cpu_to_le32(io_parms->length);
1668         req->Offset = cpu_to_le64(io_parms->offset);
1669
1670         if (request_type & CHAINED_REQUEST) {
1671                 if (!(request_type & END_OF_CHAIN)) {
1672                         /* 4 for rfc1002 length field */
1673                         req->hdr.NextCommand =
1674                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1675                 } else /* END_OF_CHAIN */
1676                         req->hdr.NextCommand = 0;
1677                 if (request_type & RELATED_REQUEST) {
1678                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1679                         /*
1680                          * Related requests use info from previous read request
1681                          * in chain.
1682                          */
1683                         req->hdr.SessionId = 0xFFFFFFFF;
1684                         req->hdr.TreeId = 0xFFFFFFFF;
1685                         req->PersistentFileId = 0xFFFFFFFF;
1686                         req->VolatileFileId = 0xFFFFFFFF;
1687                 }
1688         }
1689         if (remaining_bytes > io_parms->length)
1690                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1691         else
1692                 req->RemainingBytes = 0;
1693
1694         iov[0].iov_base = (char *)req;
1695         /* 4 for rfc1002 length field */
1696         iov[0].iov_len = get_rfc1002_length(req) + 4;
1697         return rc;
1698 }
1699
1700 static void
1701 smb2_readv_callback(struct mid_q_entry *mid)
1702 {
1703         struct cifs_readdata *rdata = mid->callback_data;
1704         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1705         struct TCP_Server_Info *server = tcon->ses->server;
1706         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1707         unsigned int credits_received = 1;
1708         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1709                                  .rq_nvec = 1,
1710                                  .rq_pages = rdata->pages,
1711                                  .rq_npages = rdata->nr_pages,
1712                                  .rq_pagesz = rdata->pagesz,
1713                                  .rq_tailsz = rdata->tailsz };
1714
1715         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1716                  __func__, mid->mid, mid->mid_state, rdata->result,
1717                  rdata->bytes);
1718
1719         switch (mid->mid_state) {
1720         case MID_RESPONSE_RECEIVED:
1721                 credits_received = le16_to_cpu(buf->CreditRequest);
1722                 /* result already set, check signature */
1723                 if (server->sign) {
1724                         int rc;
1725
1726                         rc = smb2_verify_signature(&rqst, server);
1727                         if (rc)
1728                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1729                                          rc);
1730                 }
1731                 /* FIXME: should this be counted toward the initiating task? */
1732                 task_io_account_read(rdata->got_bytes);
1733                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1734                 break;
1735         case MID_REQUEST_SUBMITTED:
1736         case MID_RETRY_NEEDED:
1737                 rdata->result = -EAGAIN;
1738                 if (server->sign && rdata->got_bytes)
1739                         /* reset bytes number since we can not check a sign */
1740                         rdata->got_bytes = 0;
1741                 /* FIXME: should this be counted toward the initiating task? */
1742                 task_io_account_read(rdata->got_bytes);
1743                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1744                 break;
1745         default:
1746                 if (rdata->result != -ENODATA)
1747                         rdata->result = -EIO;
1748         }
1749
1750         if (rdata->result)
1751                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1752
1753         queue_work(cifsiod_wq, &rdata->work);
1754         DeleteMidQEntry(mid);
1755         add_credits(server, credits_received, 0);
1756 }
1757
1758 /* smb2_async_readv - send an async write, and set up mid to handle result */
1759 int
1760 smb2_async_readv(struct cifs_readdata *rdata)
1761 {
1762         int rc, flags = 0;
1763         struct smb2_hdr *buf;
1764         struct cifs_io_parms io_parms;
1765         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1766                                  .rq_nvec = 1 };
1767         struct TCP_Server_Info *server;
1768
1769         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1770                  __func__, rdata->offset, rdata->bytes);
1771
1772         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1773         io_parms.offset = rdata->offset;
1774         io_parms.length = rdata->bytes;
1775         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1776         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1777         io_parms.pid = rdata->pid;
1778
1779         server = io_parms.tcon->ses->server;
1780
1781         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1782         if (rc) {
1783                 if (rc == -EAGAIN && rdata->credits) {
1784                         /* credits was reset by reconnect */
1785                         rdata->credits = 0;
1786                         /* reduce in_flight value since we won't send the req */
1787                         spin_lock(&server->req_lock);
1788                         server->in_flight--;
1789                         spin_unlock(&server->req_lock);
1790                 }
1791                 return rc;
1792         }
1793
1794         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1795         /* 4 for rfc1002 length field */
1796         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1797
1798         if (rdata->credits) {
1799                 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
1800                                                 SMB2_MAX_BUFFER_SIZE));
1801                 spin_lock(&server->req_lock);
1802                 server->credits += rdata->credits -
1803                                                 le16_to_cpu(buf->CreditCharge);
1804                 spin_unlock(&server->req_lock);
1805                 wake_up(&server->request_q);
1806                 flags = CIFS_HAS_CREDITS;
1807         }
1808
1809         kref_get(&rdata->refcount);
1810         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1811                              cifs_readv_receive, smb2_readv_callback,
1812                              rdata, flags);
1813         if (rc) {
1814                 kref_put(&rdata->refcount, cifs_readdata_release);
1815                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1816         }
1817
1818         cifs_small_buf_release(buf);
1819         return rc;
1820 }
1821
1822 int
1823 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1824           unsigned int *nbytes, char **buf, int *buf_type)
1825 {
1826         int resp_buftype, rc = -EACCES;
1827         struct smb2_read_rsp *rsp = NULL;
1828         struct kvec iov[1];
1829
1830         *nbytes = 0;
1831         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1832         if (rc)
1833                 return rc;
1834
1835         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1836                           &resp_buftype, CIFS_LOG_ERROR);
1837
1838         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1839
1840         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1841                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1842                 return 0;
1843         }
1844
1845         if (rc) {
1846                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1847                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1848         } else {
1849                 *nbytes = le32_to_cpu(rsp->DataLength);
1850                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1851                     (*nbytes > io_parms->length)) {
1852                         cifs_dbg(FYI, "bad length %d for count %d\n",
1853                                  *nbytes, io_parms->length);
1854                         rc = -EIO;
1855                         *nbytes = 0;
1856                 }
1857         }
1858
1859         if (*buf) {
1860                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1861                        *nbytes);
1862                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1863         } else if (resp_buftype != CIFS_NO_BUFFER) {
1864                 *buf = iov[0].iov_base;
1865                 if (resp_buftype == CIFS_SMALL_BUFFER)
1866                         *buf_type = CIFS_SMALL_BUFFER;
1867                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1868                         *buf_type = CIFS_LARGE_BUFFER;
1869         }
1870         return rc;
1871 }
1872
1873 /*
1874  * Check the mid_state and signature on received buffer (if any), and queue the
1875  * workqueue completion task.
1876  */
1877 static void
1878 smb2_writev_callback(struct mid_q_entry *mid)
1879 {
1880         struct cifs_writedata *wdata = mid->callback_data;
1881         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1882         unsigned int written;
1883         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1884         unsigned int credits_received = 1;
1885
1886         switch (mid->mid_state) {
1887         case MID_RESPONSE_RECEIVED:
1888                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1889                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1890                 if (wdata->result != 0)
1891                         break;
1892
1893                 written = le32_to_cpu(rsp->DataLength);
1894                 /*
1895                  * Mask off high 16 bits when bytes written as returned
1896                  * by the server is greater than bytes requested by the
1897                  * client. OS/2 servers are known to set incorrect
1898                  * CountHigh values.
1899                  */
1900                 if (written > wdata->bytes)
1901                         written &= 0xFFFF;
1902
1903                 if (written < wdata->bytes)
1904                         wdata->result = -ENOSPC;
1905                 else
1906                         wdata->bytes = written;
1907                 break;
1908         case MID_REQUEST_SUBMITTED:
1909         case MID_RETRY_NEEDED:
1910                 wdata->result = -EAGAIN;
1911                 break;
1912         default:
1913                 wdata->result = -EIO;
1914                 break;
1915         }
1916
1917         if (wdata->result)
1918                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1919
1920         queue_work(cifsiod_wq, &wdata->work);
1921         DeleteMidQEntry(mid);
1922         add_credits(tcon->ses->server, credits_received, 0);
1923 }
1924
1925 /* smb2_async_writev - send an async write, and set up mid to handle result */
1926 int
1927 smb2_async_writev(struct cifs_writedata *wdata,
1928                   void (*release)(struct kref *kref))
1929 {
1930         int rc = -EACCES, flags = 0;
1931         struct smb2_write_req *req = NULL;
1932         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1933         struct TCP_Server_Info *server = tcon->ses->server;
1934         struct kvec iov;
1935         struct smb_rqst rqst;
1936
1937         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1938         if (rc) {
1939                 if (rc == -EAGAIN && wdata->credits) {
1940                         /* credits was reset by reconnect */
1941                         wdata->credits = 0;
1942                         /* reduce in_flight value since we won't send the req */
1943                         spin_lock(&server->req_lock);
1944                         server->in_flight--;
1945                         spin_unlock(&server->req_lock);
1946                 }
1947                 goto async_writev_out;
1948         }
1949
1950         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1951
1952         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1953         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1954         req->WriteChannelInfoOffset = 0;
1955         req->WriteChannelInfoLength = 0;
1956         req->Channel = 0;
1957         req->Offset = cpu_to_le64(wdata->offset);
1958         /* 4 for rfc1002 length field */
1959         req->DataOffset = cpu_to_le16(
1960                                 offsetof(struct smb2_write_req, Buffer) - 4);
1961         req->RemainingBytes = 0;
1962
1963         /* 4 for rfc1002 length field and 1 for Buffer */
1964         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1965         iov.iov_base = req;
1966
1967         rqst.rq_iov = &iov;
1968         rqst.rq_nvec = 1;
1969         rqst.rq_pages = wdata->pages;
1970         rqst.rq_npages = wdata->nr_pages;
1971         rqst.rq_pagesz = wdata->pagesz;
1972         rqst.rq_tailsz = wdata->tailsz;
1973
1974         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1975                  wdata->offset, wdata->bytes);
1976
1977         req->Length = cpu_to_le32(wdata->bytes);
1978
1979         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1980
1981         if (wdata->credits) {
1982                 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
1983                                                     SMB2_MAX_BUFFER_SIZE));
1984                 spin_lock(&server->req_lock);
1985                 server->credits += wdata->credits -
1986                                         le16_to_cpu(req->hdr.CreditCharge);
1987                 spin_unlock(&server->req_lock);
1988                 wake_up(&server->request_q);
1989                 flags = CIFS_HAS_CREDITS;
1990         }
1991
1992         kref_get(&wdata->refcount);
1993         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
1994                              flags);
1995
1996         if (rc) {
1997                 kref_put(&wdata->refcount, release);
1998                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1999         }
2000
2001 async_writev_out:
2002         cifs_small_buf_release(req);
2003         return rc;
2004 }
2005
2006 /*
2007  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2008  * The length field from io_parms must be at least 1 and indicates a number of
2009  * elements with data to write that begins with position 1 in iov array. All
2010  * data length is specified by count.
2011  */
2012 int
2013 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2014            unsigned int *nbytes, struct kvec *iov, int n_vec)
2015 {
2016         int rc = 0;
2017         struct smb2_write_req *req = NULL;
2018         struct smb2_write_rsp *rsp = NULL;
2019         int resp_buftype;
2020         *nbytes = 0;
2021
2022         if (n_vec < 1)
2023                 return rc;
2024
2025         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2026         if (rc)
2027                 return rc;
2028
2029         if (io_parms->tcon->ses->server == NULL)
2030                 return -ECONNABORTED;
2031
2032         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2033
2034         req->PersistentFileId = io_parms->persistent_fid;
2035         req->VolatileFileId = io_parms->volatile_fid;
2036         req->WriteChannelInfoOffset = 0;
2037         req->WriteChannelInfoLength = 0;
2038         req->Channel = 0;
2039         req->Length = cpu_to_le32(io_parms->length);
2040         req->Offset = cpu_to_le64(io_parms->offset);
2041         /* 4 for rfc1002 length field */
2042         req->DataOffset = cpu_to_le16(
2043                                 offsetof(struct smb2_write_req, Buffer) - 4);
2044         req->RemainingBytes = 0;
2045
2046         iov[0].iov_base = (char *)req;
2047         /* 4 for rfc1002 length field and 1 for Buffer */
2048         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2049
2050         /* length of entire message including data to be written */
2051         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2052
2053         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2054                           &resp_buftype, 0);
2055         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2056
2057         if (rc) {
2058                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2059                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2060         } else
2061                 *nbytes = le32_to_cpu(rsp->DataLength);
2062
2063         free_rsp_buf(resp_buftype, rsp);
2064         return rc;
2065 }
2066
2067 static unsigned int
2068 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2069 {
2070         int len;
2071         unsigned int entrycount = 0;
2072         unsigned int next_offset = 0;
2073         FILE_DIRECTORY_INFO *entryptr;
2074
2075         if (bufstart == NULL)
2076                 return 0;
2077
2078         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2079
2080         while (1) {
2081                 entryptr = (FILE_DIRECTORY_INFO *)
2082                                         ((char *)entryptr + next_offset);
2083
2084                 if ((char *)entryptr + size > end_of_buf) {
2085                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2086                         break;
2087                 }
2088
2089                 len = le32_to_cpu(entryptr->FileNameLength);
2090                 if ((char *)entryptr + len + size > end_of_buf) {
2091                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2092                                  end_of_buf);
2093                         break;
2094                 }
2095
2096                 *lastentry = (char *)entryptr;
2097                 entrycount++;
2098
2099                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2100                 if (!next_offset)
2101                         break;
2102         }
2103
2104         return entrycount;
2105 }
2106
2107 /*
2108  * Readdir/FindFirst
2109  */
2110 int
2111 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2112                      u64 persistent_fid, u64 volatile_fid, int index,
2113                      struct cifs_search_info *srch_inf)
2114 {
2115         struct smb2_query_directory_req *req;
2116         struct smb2_query_directory_rsp *rsp = NULL;
2117         struct kvec iov[2];
2118         int rc = 0;
2119         int len;
2120         int resp_buftype = CIFS_NO_BUFFER;
2121         unsigned char *bufptr;
2122         struct TCP_Server_Info *server;
2123         struct cifs_ses *ses = tcon->ses;
2124         __le16 asteriks = cpu_to_le16('*');
2125         char *end_of_smb;
2126         unsigned int output_size = CIFSMaxBufSize;
2127         size_t info_buf_size;
2128
2129         if (ses && (ses->server))
2130                 server = ses->server;
2131         else
2132                 return -EIO;
2133
2134         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2135         if (rc)
2136                 return rc;
2137
2138         switch (srch_inf->info_level) {
2139         case SMB_FIND_FILE_DIRECTORY_INFO:
2140                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2141                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2142                 break;
2143         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2144                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2145                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2146                 break;
2147         default:
2148                 cifs_dbg(VFS, "info level %u isn't supported\n",
2149                          srch_inf->info_level);
2150                 rc = -EINVAL;
2151                 goto qdir_exit;
2152         }
2153
2154         req->FileIndex = cpu_to_le32(index);
2155         req->PersistentFileId = persistent_fid;
2156         req->VolatileFileId = volatile_fid;
2157
2158         len = 0x2;
2159         bufptr = req->Buffer;
2160         memcpy(bufptr, &asteriks, len);
2161
2162         req->FileNameOffset =
2163                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2164         req->FileNameLength = cpu_to_le16(len);
2165         /*
2166          * BB could be 30 bytes or so longer if we used SMB2 specific
2167          * buffer lengths, but this is safe and close enough.
2168          */
2169         output_size = min_t(unsigned int, output_size, server->maxBuf);
2170         output_size = min_t(unsigned int, output_size, 2 << 15);
2171         req->OutputBufferLength = cpu_to_le32(output_size);
2172
2173         iov[0].iov_base = (char *)req;
2174         /* 4 for RFC1001 length and 1 for Buffer */
2175         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2176
2177         iov[1].iov_base = (char *)(req->Buffer);
2178         iov[1].iov_len = len;
2179
2180         inc_rfc1001_len(req, len - 1 /* Buffer */);
2181
2182         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2183         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2184
2185         if (rc) {
2186                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2187                         srch_inf->endOfSearch = true;
2188                         rc = 0;
2189                 }
2190                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2191                 goto qdir_exit;
2192         }
2193
2194         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2195                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2196                           info_buf_size);
2197         if (rc)
2198                 goto qdir_exit;
2199
2200         srch_inf->unicode = true;
2201
2202         if (srch_inf->ntwrk_buf_start) {
2203                 if (srch_inf->smallBuf)
2204                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2205                 else
2206                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2207         }
2208         srch_inf->ntwrk_buf_start = (char *)rsp;
2209         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2210                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2211         /* 4 for rfc1002 length field */
2212         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2213         srch_inf->entries_in_buffer =
2214                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2215                                     &srch_inf->last_entry, info_buf_size);
2216         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2217         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2218                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2219                  srch_inf->srch_entries_start, srch_inf->last_entry);
2220         if (resp_buftype == CIFS_LARGE_BUFFER)
2221                 srch_inf->smallBuf = false;
2222         else if (resp_buftype == CIFS_SMALL_BUFFER)
2223                 srch_inf->smallBuf = true;
2224         else
2225                 cifs_dbg(VFS, "illegal search buffer type\n");
2226
2227         return rc;
2228
2229 qdir_exit:
2230         free_rsp_buf(resp_buftype, rsp);
2231         return rc;
2232 }
2233
2234 static int
2235 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2236                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2237                unsigned int num, void **data, unsigned int *size)
2238 {
2239         struct smb2_set_info_req *req;
2240         struct smb2_set_info_rsp *rsp = NULL;
2241         struct kvec *iov;
2242         int rc = 0;
2243         int resp_buftype;
2244         unsigned int i;
2245         struct TCP_Server_Info *server;
2246         struct cifs_ses *ses = tcon->ses;
2247
2248         if (ses && (ses->server))
2249                 server = ses->server;
2250         else
2251                 return -EIO;
2252
2253         if (!num)
2254                 return -EINVAL;
2255
2256         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2257         if (!iov)
2258                 return -ENOMEM;
2259
2260         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2261         if (rc) {
2262                 kfree(iov);
2263                 return rc;
2264         }
2265
2266         req->hdr.ProcessId = cpu_to_le32(pid);
2267
2268         req->InfoType = SMB2_O_INFO_FILE;
2269         req->FileInfoClass = info_class;
2270         req->PersistentFileId = persistent_fid;
2271         req->VolatileFileId = volatile_fid;
2272
2273         /* 4 for RFC1001 length and 1 for Buffer */
2274         req->BufferOffset =
2275                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2276         req->BufferLength = cpu_to_le32(*size);
2277
2278         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2279
2280         memcpy(req->Buffer, *data, *size);
2281
2282         iov[0].iov_base = (char *)req;
2283         /* 4 for RFC1001 length */
2284         iov[0].iov_len = get_rfc1002_length(req) + 4;
2285
2286         for (i = 1; i < num; i++) {
2287                 inc_rfc1001_len(req, size[i]);
2288                 le32_add_cpu(&req->BufferLength, size[i]);
2289                 iov[i].iov_base = (char *)data[i];
2290                 iov[i].iov_len = size[i];
2291         }
2292
2293         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2294         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2295
2296         if (rc != 0)
2297                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2298
2299         free_rsp_buf(resp_buftype, rsp);
2300         kfree(iov);
2301         return rc;
2302 }
2303
2304 int
2305 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2306             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2307 {
2308         struct smb2_file_rename_info info;
2309         void **data;
2310         unsigned int size[2];
2311         int rc;
2312         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2313
2314         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2315         if (!data)
2316                 return -ENOMEM;
2317
2318         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2319                               /* 0 = fail if target already exists */
2320         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2321         info.FileNameLength = cpu_to_le32(len);
2322
2323         data[0] = &info;
2324         size[0] = sizeof(struct smb2_file_rename_info);
2325
2326         data[1] = target_file;
2327         size[1] = len + 2 /* null */;
2328
2329         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2330                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2331                            size);
2332         kfree(data);
2333         return rc;
2334 }
2335
2336 int
2337 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2338                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2339 {
2340         struct smb2_file_link_info info;
2341         void **data;
2342         unsigned int size[2];
2343         int rc;
2344         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2345
2346         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2347         if (!data)
2348                 return -ENOMEM;
2349
2350         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2351                               /* 0 = fail if link already exists */
2352         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2353         info.FileNameLength = cpu_to_le32(len);
2354
2355         data[0] = &info;
2356         size[0] = sizeof(struct smb2_file_link_info);
2357
2358         data[1] = target_file;
2359         size[1] = len + 2 /* null */;
2360
2361         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2362                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2363         kfree(data);
2364         return rc;
2365 }
2366
2367 int
2368 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2369              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2370 {
2371         struct smb2_file_eof_info info;
2372         void *data;
2373         unsigned int size;
2374
2375         info.EndOfFile = *eof;
2376
2377         data = &info;
2378         size = sizeof(struct smb2_file_eof_info);
2379
2380         if (is_falloc)
2381                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2382                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2383         else
2384                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2385                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2386 }
2387
2388 int
2389 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2390               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2391 {
2392         unsigned int size;
2393         size = sizeof(FILE_BASIC_INFO);
2394         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2395                              current->tgid, FILE_BASIC_INFORMATION, 1,
2396                              (void **)&buf, &size);
2397 }
2398
2399 int
2400 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2401                   const u64 persistent_fid, const u64 volatile_fid,
2402                   __u8 oplock_level)
2403 {
2404         int rc;
2405         struct smb2_oplock_break *req = NULL;
2406
2407         cifs_dbg(FYI, "SMB2_oplock_break\n");
2408         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2409
2410         if (rc)
2411                 return rc;
2412
2413         req->VolatileFid = volatile_fid;
2414         req->PersistentFid = persistent_fid;
2415         req->OplockLevel = oplock_level;
2416         req->hdr.CreditRequest = cpu_to_le16(1);
2417
2418         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2419         /* SMB2 buffer freed by function above */
2420
2421         if (rc) {
2422                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2423                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2424         }
2425
2426         return rc;
2427 }
2428
2429 static void
2430 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2431                         struct kstatfs *kst)
2432 {
2433         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2434                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2435         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2436         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2437         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2438         return;
2439 }
2440
2441 static int
2442 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2443                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2444 {
2445         int rc;
2446         struct smb2_query_info_req *req;
2447
2448         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2449
2450         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2451                 return -EIO;
2452
2453         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2454         if (rc)
2455                 return rc;
2456
2457         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2458         req->FileInfoClass = level;
2459         req->PersistentFileId = persistent_fid;
2460         req->VolatileFileId = volatile_fid;
2461         /* 4 for rfc1002 length field and 1 for pad */
2462         req->InputBufferOffset =
2463                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2464         req->OutputBufferLength = cpu_to_le32(
2465                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2466
2467         iov->iov_base = (char *)req;
2468         /* 4 for rfc1002 length field */
2469         iov->iov_len = get_rfc1002_length(req) + 4;
2470         return 0;
2471 }
2472
2473 int
2474 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2475               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2476 {
2477         struct smb2_query_info_rsp *rsp = NULL;
2478         struct kvec iov;
2479         int rc = 0;
2480         int resp_buftype;
2481         struct cifs_ses *ses = tcon->ses;
2482         struct smb2_fs_full_size_info *info = NULL;
2483
2484         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2485                                 sizeof(struct smb2_fs_full_size_info),
2486                                 persistent_fid, volatile_fid);
2487         if (rc)
2488                 return rc;
2489
2490         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2491         if (rc) {
2492                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2493                 goto qfsinf_exit;
2494         }
2495         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2496
2497         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2498                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2499         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2500                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2501                           sizeof(struct smb2_fs_full_size_info));
2502         if (!rc)
2503                 copy_fs_info_to_kstatfs(info, fsdata);
2504
2505 qfsinf_exit:
2506         free_rsp_buf(resp_buftype, iov.iov_base);
2507         return rc;
2508 }
2509
2510 int
2511 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2512               u64 persistent_fid, u64 volatile_fid, int level)
2513 {
2514         struct smb2_query_info_rsp *rsp = NULL;
2515         struct kvec iov;
2516         int rc = 0;
2517         int resp_buftype, max_len, min_len;
2518         struct cifs_ses *ses = tcon->ses;
2519         unsigned int rsp_len, offset;
2520
2521         if (level == FS_DEVICE_INFORMATION) {
2522                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2523                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2524         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2525                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2526                 min_len = MIN_FS_ATTR_INFO_SIZE;
2527         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2528                 max_len = sizeof(struct smb3_fs_ss_info);
2529                 min_len = sizeof(struct smb3_fs_ss_info);
2530         } else {
2531                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2532                 return -EINVAL;
2533         }
2534
2535         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2536                                 persistent_fid, volatile_fid);
2537         if (rc)
2538                 return rc;
2539
2540         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2541         if (rc) {
2542                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2543                 goto qfsattr_exit;
2544         }
2545         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2546
2547         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2548         offset = le16_to_cpu(rsp->OutputBufferOffset);
2549         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2550         if (rc)
2551                 goto qfsattr_exit;
2552
2553         if (level == FS_ATTRIBUTE_INFORMATION)
2554                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2555                         + (char *)&rsp->hdr, min_t(unsigned int,
2556                         rsp_len, max_len));
2557         else if (level == FS_DEVICE_INFORMATION)
2558                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2559                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2560         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2561                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2562                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2563                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2564                 tcon->perf_sector_size =
2565                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2566         }
2567
2568 qfsattr_exit:
2569         free_rsp_buf(resp_buftype, iov.iov_base);
2570         return rc;
2571 }
2572
2573 int
2574 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2575            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2576            const __u32 num_lock, struct smb2_lock_element *buf)
2577 {
2578         int rc = 0;
2579         struct smb2_lock_req *req = NULL;
2580         struct kvec iov[2];
2581         int resp_buf_type;
2582         unsigned int count;
2583
2584         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2585
2586         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2587         if (rc)
2588                 return rc;
2589
2590         req->hdr.ProcessId = cpu_to_le32(pid);
2591         req->LockCount = cpu_to_le16(num_lock);
2592
2593         req->PersistentFileId = persist_fid;
2594         req->VolatileFileId = volatile_fid;
2595
2596         count = num_lock * sizeof(struct smb2_lock_element);
2597         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2598
2599         iov[0].iov_base = (char *)req;
2600         /* 4 for rfc1002 length field and count for all locks */
2601         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2602         iov[1].iov_base = (char *)buf;
2603         iov[1].iov_len = count;
2604
2605         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2606         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2607         if (rc) {
2608                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2609                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2610         }
2611
2612         return rc;
2613 }
2614
2615 int
2616 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2617           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2618           const __u64 length, const __u64 offset, const __u32 lock_flags,
2619           const bool wait)
2620 {
2621         struct smb2_lock_element lock;
2622
2623         lock.Offset = cpu_to_le64(offset);
2624         lock.Length = cpu_to_le64(length);
2625         lock.Flags = cpu_to_le32(lock_flags);
2626         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2627                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2628
2629         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2630 }
2631
2632 int
2633 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2634                  __u8 *lease_key, const __le32 lease_state)
2635 {
2636         int rc;
2637         struct smb2_lease_ack *req = NULL;
2638
2639         cifs_dbg(FYI, "SMB2_lease_break\n");
2640         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2641
2642         if (rc)
2643                 return rc;
2644
2645         req->hdr.CreditRequest = cpu_to_le16(1);
2646         req->StructureSize = cpu_to_le16(36);
2647         inc_rfc1001_len(req, 12);
2648
2649         memcpy(req->LeaseKey, lease_key, 16);
2650         req->LeaseState = lease_state;
2651
2652         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2653         /* SMB2 buffer freed by function above */
2654
2655         if (rc) {
2656                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2657                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2658         }
2659
2660         return rc;
2661 }