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TOMOYO Linux Cross Reference
Linux/fs/cifs/smb2pdu.c

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  1 /*
  2  *   fs/cifs/smb2pdu.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2009, 2012
  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         hdr->TreeId = tcon->tid;
112         /* Uid is not converted */
113         if (tcon->ses)
114                 hdr->SessionId = tcon->ses->Suid;
115         /* BB check following DFS flags BB */
116         /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
117         if (tcon->share_flags & SHI1005_FLAGS_DFS)
118                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
119         /* BB how does SMB2 do case sensitive? */
120         /* if (tcon->nocase)
121                 hdr->Flags |= SMBFLG_CASELESS; */
122         if (tcon->ses && tcon->ses->server &&
123             (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
124                 hdr->Flags |= SMB2_FLAGS_SIGNED;
125 out:
126         pdu->StructureSize2 = cpu_to_le16(parmsize);
127         return;
128 }
129 
130 static int
131 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
132 {
133         int rc = 0;
134         struct nls_table *nls_codepage;
135         struct cifs_ses *ses;
136         struct TCP_Server_Info *server;
137 
138         /*
139          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
140          * check for tcp and smb session status done differently
141          * for those three - in the calling routine.
142          */
143         if (tcon == NULL)
144                 return rc;
145 
146         if (smb2_command == SMB2_TREE_CONNECT)
147                 return rc;
148 
149         if (tcon->tidStatus == CifsExiting) {
150                 /*
151                  * only tree disconnect, open, and write,
152                  * (and ulogoff which does not have tcon)
153                  * are allowed as we start force umount.
154                  */
155                 if ((smb2_command != SMB2_WRITE) &&
156                    (smb2_command != SMB2_CREATE) &&
157                    (smb2_command != SMB2_TREE_DISCONNECT)) {
158                         cFYI(1, "can not send cmd %d while umounting",
159                                 smb2_command);
160                         return -ENODEV;
161                 }
162         }
163         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
164             (!tcon->ses->server))
165                 return -EIO;
166 
167         ses = tcon->ses;
168         server = ses->server;
169 
170         /*
171          * Give demultiplex thread up to 10 seconds to reconnect, should be
172          * greater than cifs socket timeout which is 7 seconds
173          */
174         while (server->tcpStatus == CifsNeedReconnect) {
175                 /*
176                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
177                  * here since they are implicitly done when session drops.
178                  */
179                 switch (smb2_command) {
180                 /*
181                  * BB Should we keep oplock break and add flush to exceptions?
182                  */
183                 case SMB2_TREE_DISCONNECT:
184                 case SMB2_CANCEL:
185                 case SMB2_CLOSE:
186                 case SMB2_OPLOCK_BREAK:
187                         return -EAGAIN;
188                 }
189 
190                 wait_event_interruptible_timeout(server->response_q,
191                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
192 
193                 /* are we still trying to reconnect? */
194                 if (server->tcpStatus != CifsNeedReconnect)
195                         break;
196 
197                 /*
198                  * on "soft" mounts we wait once. Hard mounts keep
199                  * retrying until process is killed or server comes
200                  * back on-line
201                  */
202                 if (!tcon->retry) {
203                         cFYI(1, "gave up waiting on reconnect in smb_init");
204                         return -EHOSTDOWN;
205                 }
206         }
207 
208         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
209                 return rc;
210 
211         nls_codepage = load_nls_default();
212 
213         /*
214          * need to prevent multiple threads trying to simultaneously reconnect
215          * the same SMB session
216          */
217         mutex_lock(&tcon->ses->session_mutex);
218         rc = cifs_negotiate_protocol(0, tcon->ses);
219         if (!rc && tcon->ses->need_reconnect)
220                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
221 
222         if (rc || !tcon->need_reconnect) {
223                 mutex_unlock(&tcon->ses->session_mutex);
224                 goto out;
225         }
226 
227         cifs_mark_open_files_invalid(tcon);
228         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
229         mutex_unlock(&tcon->ses->session_mutex);
230         cFYI(1, "reconnect tcon rc = %d", rc);
231         if (rc)
232                 goto out;
233         atomic_inc(&tconInfoReconnectCount);
234         /*
235          * BB FIXME add code to check if wsize needs update due to negotiated
236          * smb buffer size shrinking.
237          */
238 out:
239         /*
240          * Check if handle based operation so we know whether we can continue
241          * or not without returning to caller to reset file handle.
242          */
243         /*
244          * BB Is flush done by server on drop of tcp session? Should we special
245          * case it and skip above?
246          */
247         switch (smb2_command) {
248         case SMB2_FLUSH:
249         case SMB2_READ:
250         case SMB2_WRITE:
251         case SMB2_LOCK:
252         case SMB2_IOCTL:
253         case SMB2_QUERY_DIRECTORY:
254         case SMB2_CHANGE_NOTIFY:
255         case SMB2_QUERY_INFO:
256         case SMB2_SET_INFO:
257                 return -EAGAIN;
258         }
259         unload_nls(nls_codepage);
260         return rc;
261 }
262 
263 /*
264  * Allocate and return pointer to an SMB request hdr, and set basic
265  * SMB information in the SMB header. If the return code is zero, this
266  * function must have filled in request_buf pointer.
267  */
268 static int
269 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
270                 void **request_buf)
271 {
272         int rc = 0;
273 
274         rc = smb2_reconnect(smb2_command, tcon);
275         if (rc)
276                 return rc;
277 
278         /* BB eventually switch this to SMB2 specific small buf size */
279         *request_buf = cifs_small_buf_get();
280         if (*request_buf == NULL) {
281                 /* BB should we add a retry in here if not a writepage? */
282                 return -ENOMEM;
283         }
284 
285         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
286 
287         if (tcon != NULL) {
288 #ifdef CONFIG_CIFS_STATS2
289                 uint16_t com_code = le16_to_cpu(smb2_command);
290                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
291 #endif
292                 cifs_stats_inc(&tcon->num_smbs_sent);
293         }
294 
295         return rc;
296 }
297 
298 static void
299 free_rsp_buf(int resp_buftype, void *rsp)
300 {
301         if (resp_buftype == CIFS_SMALL_BUFFER)
302                 cifs_small_buf_release(rsp);
303         else if (resp_buftype == CIFS_LARGE_BUFFER)
304                 cifs_buf_release(rsp);
305 }
306 
307 
308 /*
309  *
310  *      SMB2 Worker functions follow:
311  *
312  *      The general structure of the worker functions is:
313  *      1) Call smb2_init (assembles SMB2 header)
314  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
315  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
316  *      4) Decode SMB2 command specific fields in the fixed length area
317  *      5) Decode variable length data area (if any for this SMB2 command type)
318  *      6) Call free smb buffer
319  *      7) return
320  *
321  */
322 
323 int
324 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
325 {
326         struct smb2_negotiate_req *req;
327         struct smb2_negotiate_rsp *rsp;
328         struct kvec iov[1];
329         int rc = 0;
330         int resp_buftype;
331         struct TCP_Server_Info *server;
332         unsigned int sec_flags;
333         u16 temp = 0;
334         int blob_offset, blob_length;
335         char *security_blob;
336         int flags = CIFS_NEG_OP;
337 
338         cFYI(1, "Negotiate protocol");
339 
340         if (ses->server)
341                 server = ses->server;
342         else {
343                 rc = -EIO;
344                 return rc;
345         }
346 
347         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
348         if (rc)
349                 return rc;
350 
351         /* if any of auth flags (ie not sign or seal) are overriden use them */
352         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
353                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
354         else /* if override flags set only sign/seal OR them with global auth */
355                 sec_flags = global_secflags | ses->overrideSecFlg;
356 
357         cFYI(1, "sec_flags 0x%x", sec_flags);
358 
359         req->hdr.SessionId = 0;
360 
361         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
362 
363         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
364         inc_rfc1001_len(req, 2);
365 
366         /* only one of SMB2 signing flags may be set in SMB2 request */
367         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
368                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
369         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
370                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
371 
372         req->SecurityMode = cpu_to_le16(temp);
373 
374         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
375 
376         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
377 
378         iov[0].iov_base = (char *)req;
379         /* 4 for rfc1002 length field */
380         iov[0].iov_len = get_rfc1002_length(req) + 4;
381 
382         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
383 
384         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
385         /*
386          * No tcon so can't do
387          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
388          */
389         if (rc != 0)
390                 goto neg_exit;
391 
392         cFYI(1, "mode 0x%x", rsp->SecurityMode);
393 
394         /* BB we may eventually want to match the negotiated vs. requested
395            dialect, even though we are only requesting one at a time */
396         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
397                 cFYI(1, "negotiated smb2.0 dialect");
398         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
399                 cFYI(1, "negotiated smb2.1 dialect");
400         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
401                 cFYI(1, "negotiated smb3.0 dialect");
402         else {
403                 cERROR(1, "Illegal dialect returned by server %d",
404                            le16_to_cpu(rsp->DialectRevision));
405                 rc = -EIO;
406                 goto neg_exit;
407         }
408         server->dialect = le16_to_cpu(rsp->DialectRevision);
409 
410         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
411         server->max_read = le32_to_cpu(rsp->MaxReadSize);
412         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
413         /* BB Do we need to validate the SecurityMode? */
414         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
415         server->capabilities = le32_to_cpu(rsp->Capabilities);
416         /* Internal types */
417         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
418 
419         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
420                                                &rsp->hdr);
421         if (blob_length == 0) {
422                 cERROR(1, "missing security blob on negprot");
423                 rc = -EIO;
424                 goto neg_exit;
425         }
426 
427         cFYI(1, "sec_flags 0x%x", sec_flags);
428         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
429                 cFYI(1, "Signing required");
430                 if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
431                       SMB2_NEGOTIATE_SIGNING_ENABLED))) {
432                         cERROR(1, "signing required but server lacks support");
433                         rc = -EOPNOTSUPP;
434                         goto neg_exit;
435                 }
436                 server->sec_mode |= SECMODE_SIGN_REQUIRED;
437         } else if (sec_flags & CIFSSEC_MAY_SIGN) {
438                 cFYI(1, "Signing optional");
439                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
440                         cFYI(1, "Server requires signing");
441                         server->sec_mode |= SECMODE_SIGN_REQUIRED;
442                 } else {
443                         server->sec_mode &=
444                                 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
445                 }
446         } else {
447                 cFYI(1, "Signing disabled");
448                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
449                         cERROR(1, "Server requires packet signing to be enabled"
450                                   " in /proc/fs/cifs/SecurityFlags.");
451                         rc = -EOPNOTSUPP;
452                         goto neg_exit;
453                 }
454                 server->sec_mode &=
455                         ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
456         }
457 
458 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
459         rc = decode_neg_token_init(security_blob, blob_length,
460                                    &server->sec_type);
461         if (rc == 1)
462                 rc = 0;
463         else if (rc == 0) {
464                 rc = -EIO;
465                 goto neg_exit;
466         }
467 #endif
468 
469 neg_exit:
470         free_rsp_buf(resp_buftype, rsp);
471         return rc;
472 }
473 
474 int
475 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
476                 const struct nls_table *nls_cp)
477 {
478         struct smb2_sess_setup_req *req;
479         struct smb2_sess_setup_rsp *rsp = NULL;
480         struct kvec iov[2];
481         int rc = 0;
482         int resp_buftype;
483         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
484         struct TCP_Server_Info *server;
485         unsigned int sec_flags;
486         u8 temp = 0;
487         u16 blob_length = 0;
488         char *security_blob;
489         char *ntlmssp_blob = NULL;
490         bool use_spnego = false; /* else use raw ntlmssp */
491 
492         cFYI(1, "Session Setup");
493 
494         if (ses->server)
495                 server = ses->server;
496         else {
497                 rc = -EIO;
498                 return rc;
499         }
500 
501         /*
502          * If memory allocation is successful, caller of this function
503          * frees it.
504          */
505         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
506         if (!ses->ntlmssp)
507                 return -ENOMEM;
508 
509         ses->server->secType = RawNTLMSSP;
510 
511 ssetup_ntlmssp_authenticate:
512         if (phase == NtLmChallenge)
513                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
514 
515         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
516         if (rc)
517                 return rc;
518 
519         /* if any of auth flags (ie not sign or seal) are overriden use them */
520         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
521                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
522         else /* if override flags set only sign/seal OR them with global auth */
523                 sec_flags = global_secflags | ses->overrideSecFlg;
524 
525         cFYI(1, "sec_flags 0x%x", sec_flags);
526 
527         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
528         req->VcNumber = 0; /* MBZ */
529         /* to enable echos and oplocks */
530         req->hdr.CreditRequest = cpu_to_le16(3);
531 
532         /* only one of SMB2 signing flags may be set in SMB2 request */
533         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
534                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
535         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
536                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
537         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
538                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
539 
540         req->SecurityMode = temp;
541         req->Capabilities = 0;
542         req->Channel = 0; /* MBZ */
543 
544         iov[0].iov_base = (char *)req;
545         /* 4 for rfc1002 length field and 1 for pad */
546         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
547         if (phase == NtLmNegotiate) {
548                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
549                                        GFP_KERNEL);
550                 if (ntlmssp_blob == NULL) {
551                         rc = -ENOMEM;
552                         goto ssetup_exit;
553                 }
554                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
555                 if (use_spnego) {
556                         /* blob_length = build_spnego_ntlmssp_blob(
557                                         &security_blob,
558                                         sizeof(struct _NEGOTIATE_MESSAGE),
559                                         ntlmssp_blob); */
560                         /* BB eventually need to add this */
561                         cERROR(1, "spnego not supported for SMB2 yet");
562                         rc = -EOPNOTSUPP;
563                         kfree(ntlmssp_blob);
564                         goto ssetup_exit;
565                 } else {
566                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
567                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
568                         security_blob = ntlmssp_blob;
569                 }
570         } else if (phase == NtLmAuthenticate) {
571                 req->hdr.SessionId = ses->Suid;
572                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
573                                        GFP_KERNEL);
574                 if (ntlmssp_blob == NULL) {
575                         cERROR(1, "failed to malloc ntlmssp blob");
576                         rc = -ENOMEM;
577                         goto ssetup_exit;
578                 }
579                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
580                                              nls_cp);
581                 if (rc) {
582                         cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
583                         goto ssetup_exit; /* BB double check error handling */
584                 }
585                 if (use_spnego) {
586                         /* blob_length = build_spnego_ntlmssp_blob(
587                                                         &security_blob,
588                                                         blob_length,
589                                                         ntlmssp_blob); */
590                         cERROR(1, "spnego not supported for SMB2 yet");
591                         rc = -EOPNOTSUPP;
592                         kfree(ntlmssp_blob);
593                         goto ssetup_exit;
594                 } else {
595                         security_blob = ntlmssp_blob;
596                 }
597         } else {
598                 cERROR(1, "illegal ntlmssp phase");
599                 rc = -EIO;
600                 goto ssetup_exit;
601         }
602 
603         /* Testing shows that buffer offset must be at location of Buffer[0] */
604         req->SecurityBufferOffset =
605                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
606                                             1 /* pad */ - 4 /* rfc1001 len */);
607         req->SecurityBufferLength = cpu_to_le16(blob_length);
608         iov[1].iov_base = security_blob;
609         iov[1].iov_len = blob_length;
610 
611         inc_rfc1001_len(req, blob_length - 1 /* pad */);
612 
613         /* BB add code to build os and lm fields */
614 
615         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
616                           CIFS_LOG_ERROR | CIFS_NEG_OP);
617 
618         kfree(security_blob);
619         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
620         if (resp_buftype != CIFS_NO_BUFFER &&
621             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
622                 if (phase != NtLmNegotiate) {
623                         cERROR(1, "Unexpected more processing error");
624                         goto ssetup_exit;
625                 }
626                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
627                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
628                         cERROR(1, "Invalid security buffer offset %d",
629                                   le16_to_cpu(rsp->SecurityBufferOffset));
630                         rc = -EIO;
631                         goto ssetup_exit;
632                 }
633 
634                 /* NTLMSSP Negotiate sent now processing challenge (response) */
635                 phase = NtLmChallenge; /* process ntlmssp challenge */
636                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
637                 ses->Suid = rsp->hdr.SessionId;
638                 rc = decode_ntlmssp_challenge(rsp->Buffer,
639                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
640         }
641 
642         /*
643          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
644          * but at least the raw NTLMSSP case works.
645          */
646         /*
647          * No tcon so can't do
648          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
649          */
650         if (rc != 0)
651                 goto ssetup_exit;
652 
653         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
654 ssetup_exit:
655         free_rsp_buf(resp_buftype, rsp);
656 
657         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
658         if ((phase == NtLmChallenge) && (rc == 0))
659                 goto ssetup_ntlmssp_authenticate;
660         return rc;
661 }
662 
663 int
664 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
665 {
666         struct smb2_logoff_req *req; /* response is also trivial struct */
667         int rc = 0;
668         struct TCP_Server_Info *server;
669 
670         cFYI(1, "disconnect session %p", ses);
671 
672         if (ses && (ses->server))
673                 server = ses->server;
674         else
675                 return -EIO;
676 
677         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
678         if (rc)
679                 return rc;
680 
681          /* since no tcon, smb2_init can not do this, so do here */
682         req->hdr.SessionId = ses->Suid;
683         if (server->sec_mode & SECMODE_SIGN_REQUIRED)
684                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
685 
686         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
687         /*
688          * No tcon so can't do
689          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
690          */
691         return rc;
692 }
693 
694 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
695 {
696         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
697 }
698 
699 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
700 
701 int
702 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
703           struct cifs_tcon *tcon, const struct nls_table *cp)
704 {
705         struct smb2_tree_connect_req *req;
706         struct smb2_tree_connect_rsp *rsp = NULL;
707         struct kvec iov[2];
708         int rc = 0;
709         int resp_buftype;
710         int unc_path_len;
711         struct TCP_Server_Info *server;
712         __le16 *unc_path = NULL;
713 
714         cFYI(1, "TCON");
715 
716         if ((ses->server) && tree)
717                 server = ses->server;
718         else
719                 return -EIO;
720 
721         if (tcon && tcon->bad_network_name)
722                 return -ENOENT;
723 
724         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
725         if (unc_path == NULL)
726                 return -ENOMEM;
727 
728         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
729         unc_path_len *= 2;
730         if (unc_path_len < 2) {
731                 kfree(unc_path);
732                 return -EINVAL;
733         }
734 
735         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
736         if (rc) {
737                 kfree(unc_path);
738                 return rc;
739         }
740 
741         if (tcon == NULL) {
742                 /* since no tcon, smb2_init can not do this, so do here */
743                 req->hdr.SessionId = ses->Suid;
744                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
745                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
746         }
747 
748         iov[0].iov_base = (char *)req;
749         /* 4 for rfc1002 length field and 1 for pad */
750         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
751 
752         /* Testing shows that buffer offset must be at location of Buffer[0] */
753         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
754                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
755         req->PathLength = cpu_to_le16(unc_path_len - 2);
756         iov[1].iov_base = unc_path;
757         iov[1].iov_len = unc_path_len;
758 
759         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
760 
761         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
762         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
763 
764         if (rc != 0) {
765                 if (tcon) {
766                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
767                         tcon->need_reconnect = true;
768                 }
769                 goto tcon_error_exit;
770         }
771 
772         if (tcon == NULL) {
773                 ses->ipc_tid = rsp->hdr.TreeId;
774                 goto tcon_exit;
775         }
776 
777         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
778                 cFYI(1, "connection to disk share");
779         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
780                 tcon->ipc = true;
781                 cFYI(1, "connection to pipe share");
782         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
783                 tcon->print = true;
784                 cFYI(1, "connection to printer");
785         } else {
786                 cERROR(1, "unknown share type %d", rsp->ShareType);
787                 rc = -EOPNOTSUPP;
788                 goto tcon_error_exit;
789         }
790 
791         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
792         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
793         tcon->tidStatus = CifsGood;
794         tcon->need_reconnect = false;
795         tcon->tid = rsp->hdr.TreeId;
796         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
797 
798         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
799             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
800                 cERROR(1, "DFS capability contradicts DFS flag");
801 
802 tcon_exit:
803         free_rsp_buf(resp_buftype, rsp);
804         kfree(unc_path);
805         return rc;
806 
807 tcon_error_exit:
808         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
809                 cERROR(1, "BAD_NETWORK_NAME: %s", tree);
810                 tcon->bad_network_name = true;
811         }
812         goto tcon_exit;
813 }
814 
815 int
816 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
817 {
818         struct smb2_tree_disconnect_req *req; /* response is trivial */
819         int rc = 0;
820         struct TCP_Server_Info *server;
821         struct cifs_ses *ses = tcon->ses;
822 
823         cFYI(1, "Tree Disconnect");
824 
825         if (ses && (ses->server))
826                 server = ses->server;
827         else
828                 return -EIO;
829 
830         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
831                 return 0;
832 
833         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
834         if (rc)
835                 return rc;
836 
837         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
838         if (rc)
839                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
840 
841         return rc;
842 }
843 
844 static struct create_lease *
845 create_lease_buf(u8 *lease_key, u8 oplock)
846 {
847         struct create_lease *buf;
848 
849         buf = kmalloc(sizeof(struct create_lease), GFP_KERNEL);
850         if (!buf)
851                 return NULL;
852 
853         memset(buf, 0, sizeof(struct create_lease));
854 
855         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
856         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
857         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
858                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
859                                            SMB2_LEASE_READ_CACHING;
860         else if (oplock == SMB2_OPLOCK_LEVEL_II)
861                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
862         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
863                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
864                                            SMB2_LEASE_READ_CACHING |
865                                            SMB2_LEASE_WRITE_CACHING;
866 
867         buf->ccontext.DataOffset = cpu_to_le16(offsetof
868                                         (struct create_lease, lcontext));
869         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
870         buf->ccontext.NameOffset = cpu_to_le16(offsetof
871                                 (struct create_lease, Name));
872         buf->ccontext.NameLength = cpu_to_le16(4);
873         buf->Name[0] = 'R';
874         buf->Name[1] = 'q';
875         buf->Name[2] = 'L';
876         buf->Name[3] = 's';
877         return buf;
878 }
879 
880 static __u8
881 parse_lease_state(struct smb2_create_rsp *rsp)
882 {
883         char *data_offset;
884         struct create_lease *lc;
885         bool found = false;
886 
887         data_offset = (char *)rsp;
888         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
889         lc = (struct create_lease *)data_offset;
890         do {
891                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
892                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
893                     strncmp(name, "RqLs", 4)) {
894                         lc = (struct create_lease *)((char *)lc
895                                         + le32_to_cpu(lc->ccontext.Next));
896                         continue;
897                 }
898                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
899                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
900                 found = true;
901                 break;
902         } while (le32_to_cpu(lc->ccontext.Next) != 0);
903 
904         if (!found)
905                 return 0;
906 
907         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
908 }
909 
910 int
911 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
912           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
913           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
914           __u8 *oplock, struct smb2_file_all_info *buf)
915 {
916         struct smb2_create_req *req;
917         struct smb2_create_rsp *rsp;
918         struct TCP_Server_Info *server;
919         struct cifs_ses *ses = tcon->ses;
920         struct kvec iov[3];
921         int resp_buftype;
922         int uni_path_len;
923         __le16 *copy_path = NULL;
924         int copy_size;
925         int rc = 0;
926         int num_iovecs = 2;
927 
928         cFYI(1, "create/open");
929 
930         if (ses && (ses->server))
931                 server = ses->server;
932         else
933                 return -EIO;
934 
935         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
936         if (rc)
937                 return rc;
938 
939         req->ImpersonationLevel = IL_IMPERSONATION;
940         req->DesiredAccess = cpu_to_le32(desired_access);
941         /* File attributes ignored on open (used in create though) */
942         req->FileAttributes = cpu_to_le32(file_attributes);
943         req->ShareAccess = FILE_SHARE_ALL_LE;
944         req->CreateDisposition = cpu_to_le32(create_disposition);
945         req->CreateOptions = cpu_to_le32(create_options);
946         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
947         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
948                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
949 
950         iov[0].iov_base = (char *)req;
951         /* 4 for rfc1002 length field */
952         iov[0].iov_len = get_rfc1002_length(req) + 4;
953 
954         /* MUST set path len (NameLength) to 0 opening root of share */
955         if (uni_path_len >= 4) {
956                 req->NameLength = cpu_to_le16(uni_path_len - 2);
957                 /* -1 since last byte is buf[0] which is sent below (path) */
958                 iov[0].iov_len--;
959                 if (uni_path_len % 8 != 0) {
960                         copy_size = uni_path_len / 8 * 8;
961                         if (copy_size < uni_path_len)
962                                 copy_size += 8;
963 
964                         copy_path = kzalloc(copy_size, GFP_KERNEL);
965                         if (!copy_path)
966                                 return -ENOMEM;
967                         memcpy((char *)copy_path, (const char *)path,
968                                 uni_path_len);
969                         uni_path_len = copy_size;
970                         path = copy_path;
971                 }
972 
973                 iov[1].iov_len = uni_path_len;
974                 iov[1].iov_base = path;
975                 /*
976                  * -1 since last byte is buf[0] which was counted in
977                  * smb2_buf_len.
978                  */
979                 inc_rfc1001_len(req, uni_path_len - 1);
980         } else {
981                 iov[0].iov_len += 7;
982                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
983                                 req->hdr.smb2_buf_length) + 8 - 1);
984                 num_iovecs = 1;
985                 req->NameLength = 0;
986         }
987 
988         if (!server->oplocks)
989                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
990 
991         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
992             *oplock == SMB2_OPLOCK_LEVEL_NONE)
993                 req->RequestedOplockLevel = *oplock;
994         else {
995                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
996                 if (iov[num_iovecs].iov_base == NULL) {
997                         cifs_small_buf_release(req);
998                         kfree(copy_path);
999                         return -ENOMEM;
1000                 }
1001                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
1002                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1003                 req->CreateContextsOffset = cpu_to_le32(
1004                         sizeof(struct smb2_create_req) - 4 - 8 +
1005                         iov[num_iovecs-1].iov_len);
1006                 req->CreateContextsLength = cpu_to_le32(
1007                         sizeof(struct create_lease));
1008                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
1009                 num_iovecs++;
1010         }
1011 
1012         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1013         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1014 
1015         if (rc != 0) {
1016                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1017                 goto creat_exit;
1018         }
1019 
1020         *persistent_fid = rsp->PersistentFileId;
1021         *volatile_fid = rsp->VolatileFileId;
1022 
1023         if (buf) {
1024                 memcpy(buf, &rsp->CreationTime, 32);
1025                 buf->AllocationSize = rsp->AllocationSize;
1026                 buf->EndOfFile = rsp->EndofFile;
1027                 buf->Attributes = rsp->FileAttributes;
1028                 buf->NumberOfLinks = cpu_to_le32(1);
1029                 buf->DeletePending = 0;
1030         }
1031 
1032         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1033                 *oplock = parse_lease_state(rsp);
1034         else
1035                 *oplock = rsp->OplockLevel;
1036 creat_exit:
1037         kfree(copy_path);
1038         free_rsp_buf(resp_buftype, rsp);
1039         return rc;
1040 }
1041 
1042 int
1043 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1044            u64 persistent_fid, u64 volatile_fid)
1045 {
1046         struct smb2_close_req *req;
1047         struct smb2_close_rsp *rsp;
1048         struct TCP_Server_Info *server;
1049         struct cifs_ses *ses = tcon->ses;
1050         struct kvec iov[1];
1051         int resp_buftype;
1052         int rc = 0;
1053 
1054         cFYI(1, "Close");
1055 
1056         if (ses && (ses->server))
1057                 server = ses->server;
1058         else
1059                 return -EIO;
1060 
1061         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1062         if (rc)
1063                 return rc;
1064 
1065         req->PersistentFileId = persistent_fid;
1066         req->VolatileFileId = volatile_fid;
1067 
1068         iov[0].iov_base = (char *)req;
1069         /* 4 for rfc1002 length field */
1070         iov[0].iov_len = get_rfc1002_length(req) + 4;
1071 
1072         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1073         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1074 
1075         if (rc != 0) {
1076                 if (tcon)
1077                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1078                 goto close_exit;
1079         }
1080 
1081         /* BB FIXME - decode close response, update inode for caching */
1082 
1083 close_exit:
1084         free_rsp_buf(resp_buftype, rsp);
1085         return rc;
1086 }
1087 
1088 static int
1089 validate_buf(unsigned int offset, unsigned int buffer_length,
1090              struct smb2_hdr *hdr, unsigned int min_buf_size)
1091 
1092 {
1093         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1094         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1095         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1096         char *end_of_buf = begin_of_buf + buffer_length;
1097 
1098 
1099         if (buffer_length < min_buf_size) {
1100                 cERROR(1, "buffer length %d smaller than minimum size %d",
1101                            buffer_length, min_buf_size);
1102                 return -EINVAL;
1103         }
1104 
1105         /* check if beyond RFC1001 maximum length */
1106         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1107                 cERROR(1, "buffer length %d or smb length %d too large",
1108                            buffer_length, smb_len);
1109                 return -EINVAL;
1110         }
1111 
1112         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1113                 cERROR(1, "illegal server response, bad offset to data");
1114                 return -EINVAL;
1115         }
1116 
1117         return 0;
1118 }
1119 
1120 /*
1121  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1122  * Caller must free buffer.
1123  */
1124 static int
1125 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1126                       struct smb2_hdr *hdr, unsigned int minbufsize,
1127                       char *data)
1128 
1129 {
1130         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1131         int rc;
1132 
1133         if (!data)
1134                 return -EINVAL;
1135 
1136         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1137         if (rc)
1138                 return rc;
1139 
1140         memcpy(data, begin_of_buf, buffer_length);
1141 
1142         return 0;
1143 }
1144 
1145 static int
1146 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1147            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1148            size_t output_len, size_t min_len, void *data)
1149 {
1150         struct smb2_query_info_req *req;
1151         struct smb2_query_info_rsp *rsp = NULL;
1152         struct kvec iov[2];
1153         int rc = 0;
1154         int resp_buftype;
1155         struct TCP_Server_Info *server;
1156         struct cifs_ses *ses = tcon->ses;
1157 
1158         cFYI(1, "Query Info");
1159 
1160         if (ses && (ses->server))
1161                 server = ses->server;
1162         else
1163                 return -EIO;
1164 
1165         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1166         if (rc)
1167                 return rc;
1168 
1169         req->InfoType = SMB2_O_INFO_FILE;
1170         req->FileInfoClass = info_class;
1171         req->PersistentFileId = persistent_fid;
1172         req->VolatileFileId = volatile_fid;
1173         /* 4 for rfc1002 length field and 1 for Buffer */
1174         req->InputBufferOffset =
1175                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1176         req->OutputBufferLength = cpu_to_le32(output_len);
1177 
1178         iov[0].iov_base = (char *)req;
1179         /* 4 for rfc1002 length field */
1180         iov[0].iov_len = get_rfc1002_length(req) + 4;
1181 
1182         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1183         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1184 
1185         if (rc) {
1186                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1187                 goto qinf_exit;
1188         }
1189 
1190         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1191                                    le32_to_cpu(rsp->OutputBufferLength),
1192                                    &rsp->hdr, min_len, data);
1193 
1194 qinf_exit:
1195         free_rsp_buf(resp_buftype, rsp);
1196         return rc;
1197 }
1198 
1199 int
1200 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1201                 u64 persistent_fid, u64 volatile_fid,
1202                 struct smb2_file_all_info *data)
1203 {
1204         return query_info(xid, tcon, persistent_fid, volatile_fid,
1205                           FILE_ALL_INFORMATION,
1206                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1207                           sizeof(struct smb2_file_all_info), data);
1208 }
1209 
1210 int
1211 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1212                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1213 {
1214         return query_info(xid, tcon, persistent_fid, volatile_fid,
1215                           FILE_INTERNAL_INFORMATION,
1216                           sizeof(struct smb2_file_internal_info),
1217                           sizeof(struct smb2_file_internal_info), uniqueid);
1218 }
1219 
1220 /*
1221  * This is a no-op for now. We're not really interested in the reply, but
1222  * rather in the fact that the server sent one and that server->lstrp
1223  * gets updated.
1224  *
1225  * FIXME: maybe we should consider checking that the reply matches request?
1226  */
1227 static void
1228 smb2_echo_callback(struct mid_q_entry *mid)
1229 {
1230         struct TCP_Server_Info *server = mid->callback_data;
1231         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1232         unsigned int credits_received = 1;
1233 
1234         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1235                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1236 
1237         DeleteMidQEntry(mid);
1238         add_credits(server, credits_received, CIFS_ECHO_OP);
1239 }
1240 
1241 int
1242 SMB2_echo(struct TCP_Server_Info *server)
1243 {
1244         struct smb2_echo_req *req;
1245         int rc = 0;
1246         struct kvec iov;
1247         struct smb_rqst rqst = { .rq_iov = &iov,
1248                                  .rq_nvec = 1 };
1249 
1250         cFYI(1, "In echo request");
1251 
1252         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1253         if (rc)
1254                 return rc;
1255 
1256         req->hdr.CreditRequest = cpu_to_le16(1);
1257 
1258         iov.iov_base = (char *)req;
1259         /* 4 for rfc1002 length field */
1260         iov.iov_len = get_rfc1002_length(req) + 4;
1261 
1262         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1263                              CIFS_ECHO_OP);
1264         if (rc)
1265                 cFYI(1, "Echo request failed: %d", rc);
1266 
1267         cifs_small_buf_release(req);
1268         return rc;
1269 }
1270 
1271 int
1272 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1273            u64 volatile_fid)
1274 {
1275         struct smb2_flush_req *req;
1276         struct TCP_Server_Info *server;
1277         struct cifs_ses *ses = tcon->ses;
1278         struct kvec iov[1];
1279         int resp_buftype;
1280         int rc = 0;
1281 
1282         cFYI(1, "Flush");
1283 
1284         if (ses && (ses->server))
1285                 server = ses->server;
1286         else
1287                 return -EIO;
1288 
1289         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1290         if (rc)
1291                 return rc;
1292 
1293         req->PersistentFileId = persistent_fid;
1294         req->VolatileFileId = volatile_fid;
1295 
1296         iov[0].iov_base = (char *)req;
1297         /* 4 for rfc1002 length field */
1298         iov[0].iov_len = get_rfc1002_length(req) + 4;
1299 
1300         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1301 
1302         if ((rc != 0) && tcon)
1303                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1304 
1305         free_rsp_buf(resp_buftype, iov[0].iov_base);
1306         return rc;
1307 }
1308 
1309 /*
1310  * To form a chain of read requests, any read requests after the first should
1311  * have the end_of_chain boolean set to true.
1312  */
1313 static int
1314 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1315                   unsigned int remaining_bytes, int request_type)
1316 {
1317         int rc = -EACCES;
1318         struct smb2_read_req *req = NULL;
1319 
1320         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1321         if (rc)
1322                 return rc;
1323         if (io_parms->tcon->ses->server == NULL)
1324                 return -ECONNABORTED;
1325 
1326         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1327 
1328         req->PersistentFileId = io_parms->persistent_fid;
1329         req->VolatileFileId = io_parms->volatile_fid;
1330         req->ReadChannelInfoOffset = 0; /* reserved */
1331         req->ReadChannelInfoLength = 0; /* reserved */
1332         req->Channel = 0; /* reserved */
1333         req->MinimumCount = 0;
1334         req->Length = cpu_to_le32(io_parms->length);
1335         req->Offset = cpu_to_le64(io_parms->offset);
1336 
1337         if (request_type & CHAINED_REQUEST) {
1338                 if (!(request_type & END_OF_CHAIN)) {
1339                         /* 4 for rfc1002 length field */
1340                         req->hdr.NextCommand =
1341                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1342                 } else /* END_OF_CHAIN */
1343                         req->hdr.NextCommand = 0;
1344                 if (request_type & RELATED_REQUEST) {
1345                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1346                         /*
1347                          * Related requests use info from previous read request
1348                          * in chain.
1349                          */
1350                         req->hdr.SessionId = 0xFFFFFFFF;
1351                         req->hdr.TreeId = 0xFFFFFFFF;
1352                         req->PersistentFileId = 0xFFFFFFFF;
1353                         req->VolatileFileId = 0xFFFFFFFF;
1354                 }
1355         }
1356         if (remaining_bytes > io_parms->length)
1357                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1358         else
1359                 req->RemainingBytes = 0;
1360 
1361         iov[0].iov_base = (char *)req;
1362         /* 4 for rfc1002 length field */
1363         iov[0].iov_len = get_rfc1002_length(req) + 4;
1364         return rc;
1365 }
1366 
1367 static void
1368 smb2_readv_callback(struct mid_q_entry *mid)
1369 {
1370         struct cifs_readdata *rdata = mid->callback_data;
1371         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1372         struct TCP_Server_Info *server = tcon->ses->server;
1373         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1374         unsigned int credits_received = 1;
1375         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1376                                  .rq_nvec = 1,
1377                                  .rq_pages = rdata->pages,
1378                                  .rq_npages = rdata->nr_pages,
1379                                  .rq_pagesz = rdata->pagesz,
1380                                  .rq_tailsz = rdata->tailsz };
1381 
1382         cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__,
1383                 mid->mid, mid->mid_state, rdata->result, rdata->bytes);
1384 
1385         switch (mid->mid_state) {
1386         case MID_RESPONSE_RECEIVED:
1387                 credits_received = le16_to_cpu(buf->CreditRequest);
1388                 /* result already set, check signature */
1389                 if (server->sec_mode &
1390                     (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1391                         int rc;
1392 
1393                         rc = smb2_verify_signature(&rqst, server);
1394                         if (rc)
1395                                 cERROR(1, "SMB signature verification returned "
1396                                        "error = %d", rc);
1397                 }
1398                 /* FIXME: should this be counted toward the initiating task? */
1399                 task_io_account_read(rdata->bytes);
1400                 cifs_stats_bytes_read(tcon, rdata->bytes);
1401                 break;
1402         case MID_REQUEST_SUBMITTED:
1403         case MID_RETRY_NEEDED:
1404                 rdata->result = -EAGAIN;
1405                 break;
1406         default:
1407                 if (rdata->result != -ENODATA)
1408                         rdata->result = -EIO;
1409         }
1410 
1411         if (rdata->result)
1412                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1413 
1414         queue_work(cifsiod_wq, &rdata->work);
1415         DeleteMidQEntry(mid);
1416         add_credits(server, credits_received, 0);
1417 }
1418 
1419 /* smb2_async_readv - send an async write, and set up mid to handle result */
1420 int
1421 smb2_async_readv(struct cifs_readdata *rdata)
1422 {
1423         int rc;
1424         struct smb2_hdr *buf;
1425         struct cifs_io_parms io_parms;
1426         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1427                                  .rq_nvec = 1 };
1428 
1429         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
1430                 rdata->offset, rdata->bytes);
1431 
1432         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1433         io_parms.offset = rdata->offset;
1434         io_parms.length = rdata->bytes;
1435         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1436         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1437         io_parms.pid = rdata->pid;
1438         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1439         if (rc)
1440                 return rc;
1441 
1442         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1443         /* 4 for rfc1002 length field */
1444         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1445 
1446         kref_get(&rdata->refcount);
1447         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1448                              cifs_readv_receive, smb2_readv_callback,
1449                              rdata, 0);
1450         if (rc) {
1451                 kref_put(&rdata->refcount, cifs_readdata_release);
1452                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1453         }
1454 
1455         cifs_small_buf_release(buf);
1456         return rc;
1457 }
1458 
1459 int
1460 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1461           unsigned int *nbytes, char **buf, int *buf_type)
1462 {
1463         int resp_buftype, rc = -EACCES;
1464         struct smb2_read_rsp *rsp = NULL;
1465         struct kvec iov[1];
1466 
1467         *nbytes = 0;
1468         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1469         if (rc)
1470                 return rc;
1471 
1472         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1473                           &resp_buftype, CIFS_LOG_ERROR);
1474 
1475         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1476 
1477         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1478                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1479                 return 0;
1480         }
1481 
1482         if (rc) {
1483                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1484                 cERROR(1, "Send error in read = %d", rc);
1485         } else {
1486                 *nbytes = le32_to_cpu(rsp->DataLength);
1487                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1488                     (*nbytes > io_parms->length)) {
1489                         cFYI(1, "bad length %d for count %d", *nbytes,
1490                                 io_parms->length);
1491                         rc = -EIO;
1492                         *nbytes = 0;
1493                 }
1494         }
1495 
1496         if (*buf) {
1497                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1498                        *nbytes);
1499                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1500         } else if (resp_buftype != CIFS_NO_BUFFER) {
1501                 *buf = iov[0].iov_base;
1502                 if (resp_buftype == CIFS_SMALL_BUFFER)
1503                         *buf_type = CIFS_SMALL_BUFFER;
1504                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1505                         *buf_type = CIFS_LARGE_BUFFER;
1506         }
1507         return rc;
1508 }
1509 
1510 /*
1511  * Check the mid_state and signature on received buffer (if any), and queue the
1512  * workqueue completion task.
1513  */
1514 static void
1515 smb2_writev_callback(struct mid_q_entry *mid)
1516 {
1517         struct cifs_writedata *wdata = mid->callback_data;
1518         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1519         unsigned int written;
1520         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1521         unsigned int credits_received = 1;
1522 
1523         switch (mid->mid_state) {
1524         case MID_RESPONSE_RECEIVED:
1525                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1526                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1527                 if (wdata->result != 0)
1528                         break;
1529 
1530                 written = le32_to_cpu(rsp->DataLength);
1531                 /*
1532                  * Mask off high 16 bits when bytes written as returned
1533                  * by the server is greater than bytes requested by the
1534                  * client. OS/2 servers are known to set incorrect
1535                  * CountHigh values.
1536                  */
1537                 if (written > wdata->bytes)
1538                         written &= 0xFFFF;
1539 
1540                 if (written < wdata->bytes)
1541                         wdata->result = -ENOSPC;
1542                 else
1543                         wdata->bytes = written;
1544                 break;
1545         case MID_REQUEST_SUBMITTED:
1546         case MID_RETRY_NEEDED:
1547                 wdata->result = -EAGAIN;
1548                 break;
1549         default:
1550                 wdata->result = -EIO;
1551                 break;
1552         }
1553 
1554         if (wdata->result)
1555                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1556 
1557         queue_work(cifsiod_wq, &wdata->work);
1558         DeleteMidQEntry(mid);
1559         add_credits(tcon->ses->server, credits_received, 0);
1560 }
1561 
1562 /* smb2_async_writev - send an async write, and set up mid to handle result */
1563 int
1564 smb2_async_writev(struct cifs_writedata *wdata)
1565 {
1566         int rc = -EACCES;
1567         struct smb2_write_req *req = NULL;
1568         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1569         struct kvec iov;
1570         struct smb_rqst rqst;
1571 
1572         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1573         if (rc)
1574                 goto async_writev_out;
1575 
1576         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1577 
1578         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1579         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1580         req->WriteChannelInfoOffset = 0;
1581         req->WriteChannelInfoLength = 0;
1582         req->Channel = 0;
1583         req->Offset = cpu_to_le64(wdata->offset);
1584         /* 4 for rfc1002 length field */
1585         req->DataOffset = cpu_to_le16(
1586                                 offsetof(struct smb2_write_req, Buffer) - 4);
1587         req->RemainingBytes = 0;
1588 
1589         /* 4 for rfc1002 length field and 1 for Buffer */
1590         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1591         iov.iov_base = req;
1592 
1593         rqst.rq_iov = &iov;
1594         rqst.rq_nvec = 1;
1595         rqst.rq_pages = wdata->pages;
1596         rqst.rq_npages = wdata->nr_pages;
1597         rqst.rq_pagesz = wdata->pagesz;
1598         rqst.rq_tailsz = wdata->tailsz;
1599 
1600         cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
1601 
1602         req->Length = cpu_to_le32(wdata->bytes);
1603 
1604         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1605 
1606         kref_get(&wdata->refcount);
1607         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1608                                 smb2_writev_callback, wdata, 0);
1609 
1610         if (rc) {
1611                 kref_put(&wdata->refcount, cifs_writedata_release);
1612                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1613         }
1614 
1615 async_writev_out:
1616         cifs_small_buf_release(req);
1617         return rc;
1618 }
1619 
1620 /*
1621  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1622  * The length field from io_parms must be at least 1 and indicates a number of
1623  * elements with data to write that begins with position 1 in iov array. All
1624  * data length is specified by count.
1625  */
1626 int
1627 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1628            unsigned int *nbytes, struct kvec *iov, int n_vec)
1629 {
1630         int rc = 0;
1631         struct smb2_write_req *req = NULL;
1632         struct smb2_write_rsp *rsp = NULL;
1633         int resp_buftype;
1634         *nbytes = 0;
1635 
1636         if (n_vec < 1)
1637                 return rc;
1638 
1639         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1640         if (rc)
1641                 return rc;
1642 
1643         if (io_parms->tcon->ses->server == NULL)
1644                 return -ECONNABORTED;
1645 
1646         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1647 
1648         req->PersistentFileId = io_parms->persistent_fid;
1649         req->VolatileFileId = io_parms->volatile_fid;
1650         req->WriteChannelInfoOffset = 0;
1651         req->WriteChannelInfoLength = 0;
1652         req->Channel = 0;
1653         req->Length = cpu_to_le32(io_parms->length);
1654         req->Offset = cpu_to_le64(io_parms->offset);
1655         /* 4 for rfc1002 length field */
1656         req->DataOffset = cpu_to_le16(
1657                                 offsetof(struct smb2_write_req, Buffer) - 4);
1658         req->RemainingBytes = 0;
1659 
1660         iov[0].iov_base = (char *)req;
1661         /* 4 for rfc1002 length field and 1 for Buffer */
1662         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1663 
1664         /* length of entire message including data to be written */
1665         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1666 
1667         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1668                           &resp_buftype, 0);
1669         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1670 
1671         if (rc) {
1672                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1673                 cERROR(1, "Send error in write = %d", rc);
1674         } else
1675                 *nbytes = le32_to_cpu(rsp->DataLength);
1676 
1677         free_rsp_buf(resp_buftype, rsp);
1678         return rc;
1679 }
1680 
1681 static unsigned int
1682 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1683 {
1684         int len;
1685         unsigned int entrycount = 0;
1686         unsigned int next_offset = 0;
1687         FILE_DIRECTORY_INFO *entryptr;
1688 
1689         if (bufstart == NULL)
1690                 return 0;
1691 
1692         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1693 
1694         while (1) {
1695                 entryptr = (FILE_DIRECTORY_INFO *)
1696                                         ((char *)entryptr + next_offset);
1697 
1698                 if ((char *)entryptr + size > end_of_buf) {
1699                         cERROR(1, "malformed search entry would overflow");
1700                         break;
1701                 }
1702 
1703                 len = le32_to_cpu(entryptr->FileNameLength);
1704                 if ((char *)entryptr + len + size > end_of_buf) {
1705                         cERROR(1, "directory entry name would overflow frame "
1706                                   "end of buf %p", end_of_buf);
1707                         break;
1708                 }
1709 
1710                 *lastentry = (char *)entryptr;
1711                 entrycount++;
1712 
1713                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1714                 if (!next_offset)
1715                         break;
1716         }
1717 
1718         return entrycount;
1719 }
1720 
1721 /*
1722  * Readdir/FindFirst
1723  */
1724 int
1725 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1726                      u64 persistent_fid, u64 volatile_fid, int index,
1727                      struct cifs_search_info *srch_inf)
1728 {
1729         struct smb2_query_directory_req *req;
1730         struct smb2_query_directory_rsp *rsp = NULL;
1731         struct kvec iov[2];
1732         int rc = 0;
1733         int len;
1734         int resp_buftype;
1735         unsigned char *bufptr;
1736         struct TCP_Server_Info *server;
1737         struct cifs_ses *ses = tcon->ses;
1738         __le16 asteriks = cpu_to_le16('*');
1739         char *end_of_smb;
1740         unsigned int output_size = CIFSMaxBufSize;
1741         size_t info_buf_size;
1742 
1743         if (ses && (ses->server))
1744                 server = ses->server;
1745         else
1746                 return -EIO;
1747 
1748         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1749         if (rc)
1750                 return rc;
1751 
1752         switch (srch_inf->info_level) {
1753         case SMB_FIND_FILE_DIRECTORY_INFO:
1754                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1755                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1756                 break;
1757         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1758                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1759                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1760                 break;
1761         default:
1762                 cERROR(1, "info level %u isn't supported",
1763                        srch_inf->info_level);
1764                 rc = -EINVAL;
1765                 goto qdir_exit;
1766         }
1767 
1768         req->FileIndex = cpu_to_le32(index);
1769         req->PersistentFileId = persistent_fid;
1770         req->VolatileFileId = volatile_fid;
1771 
1772         len = 0x2;
1773         bufptr = req->Buffer;
1774         memcpy(bufptr, &asteriks, len);
1775 
1776         req->FileNameOffset =
1777                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1778         req->FileNameLength = cpu_to_le16(len);
1779         /*
1780          * BB could be 30 bytes or so longer if we used SMB2 specific
1781          * buffer lengths, but this is safe and close enough.
1782          */
1783         output_size = min_t(unsigned int, output_size, server->maxBuf);
1784         output_size = min_t(unsigned int, output_size, 2 << 15);
1785         req->OutputBufferLength = cpu_to_le32(output_size);
1786 
1787         iov[0].iov_base = (char *)req;
1788         /* 4 for RFC1001 length and 1 for Buffer */
1789         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1790 
1791         iov[1].iov_base = (char *)(req->Buffer);
1792         iov[1].iov_len = len;
1793 
1794         inc_rfc1001_len(req, len - 1 /* Buffer */);
1795 
1796         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1797         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1798 
1799         if (rc) {
1800                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1801                 goto qdir_exit;
1802         }
1803 
1804         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1805                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1806                           info_buf_size);
1807         if (rc)
1808                 goto qdir_exit;
1809 
1810         srch_inf->unicode = true;
1811 
1812         if (srch_inf->ntwrk_buf_start) {
1813                 if (srch_inf->smallBuf)
1814                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1815                 else
1816                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1817         }
1818         srch_inf->ntwrk_buf_start = (char *)rsp;
1819         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1820                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1821         /* 4 for rfc1002 length field */
1822         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1823         srch_inf->entries_in_buffer =
1824                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1825                                     &srch_inf->last_entry, info_buf_size);
1826         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1827         cFYI(1, "num entries %d last_index %lld srch start %p srch end %p",
1828                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1829                 srch_inf->srch_entries_start, srch_inf->last_entry);
1830         if (resp_buftype == CIFS_LARGE_BUFFER)
1831                 srch_inf->smallBuf = false;
1832         else if (resp_buftype == CIFS_SMALL_BUFFER)
1833                 srch_inf->smallBuf = true;
1834         else
1835                 cERROR(1, "illegal search buffer type");
1836 
1837         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1838                 srch_inf->endOfSearch = 1;
1839         else
1840                 srch_inf->endOfSearch = 0;
1841 
1842         return rc;
1843 
1844 qdir_exit:
1845         free_rsp_buf(resp_buftype, rsp);
1846         return rc;
1847 }
1848 
1849 static int
1850 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1851                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1852                unsigned int num, void **data, unsigned int *size)
1853 {
1854         struct smb2_set_info_req *req;
1855         struct smb2_set_info_rsp *rsp = NULL;
1856         struct kvec *iov;
1857         int rc = 0;
1858         int resp_buftype;
1859         unsigned int i;
1860         struct TCP_Server_Info *server;
1861         struct cifs_ses *ses = tcon->ses;
1862 
1863         if (ses && (ses->server))
1864                 server = ses->server;
1865         else
1866                 return -EIO;
1867 
1868         if (!num)
1869                 return -EINVAL;
1870 
1871         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1872         if (!iov)
1873                 return -ENOMEM;
1874 
1875         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1876         if (rc) {
1877                 kfree(iov);
1878                 return rc;
1879         }
1880 
1881         req->hdr.ProcessId = cpu_to_le32(pid);
1882 
1883         req->InfoType = SMB2_O_INFO_FILE;
1884         req->FileInfoClass = info_class;
1885         req->PersistentFileId = persistent_fid;
1886         req->VolatileFileId = volatile_fid;
1887 
1888         /* 4 for RFC1001 length and 1 for Buffer */
1889         req->BufferOffset =
1890                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1891         req->BufferLength = cpu_to_le32(*size);
1892 
1893         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1894 
1895         memcpy(req->Buffer, *data, *size);
1896 
1897         iov[0].iov_base = (char *)req;
1898         /* 4 for RFC1001 length */
1899         iov[0].iov_len = get_rfc1002_length(req) + 4;
1900 
1901         for (i = 1; i < num; i++) {
1902                 inc_rfc1001_len(req, size[i]);
1903                 le32_add_cpu(&req->BufferLength, size[i]);
1904                 iov[i].iov_base = (char *)data[i];
1905                 iov[i].iov_len = size[i];
1906         }
1907 
1908         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1909         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1910 
1911         if (rc != 0) {
1912                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1913                 goto out;
1914         }
1915 out:
1916         free_rsp_buf(resp_buftype, rsp);
1917         kfree(iov);
1918         return rc;
1919 }
1920 
1921 int
1922 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1923             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1924 {
1925         struct smb2_file_rename_info info;
1926         void **data;
1927         unsigned int size[2];
1928         int rc;
1929         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1930 
1931         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1932         if (!data)
1933                 return -ENOMEM;
1934 
1935         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1936                               /* 0 = fail if target already exists */
1937         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1938         info.FileNameLength = cpu_to_le32(len);
1939 
1940         data[0] = &info;
1941         size[0] = sizeof(struct smb2_file_rename_info);
1942 
1943         data[1] = target_file;
1944         size[1] = len + 2 /* null */;
1945 
1946         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1947                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1948                            size);
1949         kfree(data);
1950         return rc;
1951 }
1952 
1953 int
1954 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1955                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1956 {
1957         struct smb2_file_link_info info;
1958         void **data;
1959         unsigned int size[2];
1960         int rc;
1961         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1962 
1963         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1964         if (!data)
1965                 return -ENOMEM;
1966 
1967         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1968                               /* 0 = fail if link already exists */
1969         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1970         info.FileNameLength = cpu_to_le32(len);
1971 
1972         data[0] = &info;
1973         size[0] = sizeof(struct smb2_file_link_info);
1974 
1975         data[1] = target_file;
1976         size[1] = len + 2 /* null */;
1977 
1978         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1979                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1980         kfree(data);
1981         return rc;
1982 }
1983 
1984 int
1985 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1986              u64 volatile_fid, u32 pid, __le64 *eof)
1987 {
1988         struct smb2_file_eof_info info;
1989         void *data;
1990         unsigned int size;
1991 
1992         info.EndOfFile = *eof;
1993 
1994         data = &info;
1995         size = sizeof(struct smb2_file_eof_info);
1996 
1997         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1998                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1999 }
2000 
2001 int
2002 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2003               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2004 {
2005         unsigned int size;
2006         size = sizeof(FILE_BASIC_INFO);
2007         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2008                              current->tgid, FILE_BASIC_INFORMATION, 1,
2009                              (void **)&buf, &size);
2010 }
2011 
2012 int
2013 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2014                   const u64 persistent_fid, const u64 volatile_fid,
2015                   __u8 oplock_level)
2016 {
2017         int rc;
2018         struct smb2_oplock_break *req = NULL;
2019 
2020         cFYI(1, "SMB2_oplock_break");
2021         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2022 
2023         if (rc)
2024                 return rc;
2025 
2026         req->VolatileFid = volatile_fid;
2027         req->PersistentFid = persistent_fid;
2028         req->OplockLevel = oplock_level;
2029         req->hdr.CreditRequest = cpu_to_le16(1);
2030 
2031         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2032         /* SMB2 buffer freed by function above */
2033 
2034         if (rc) {
2035                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2036                 cFYI(1, "Send error in Oplock Break = %d", rc);
2037         }
2038 
2039         return rc;
2040 }
2041 
2042 static void
2043 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2044                         struct kstatfs *kst)
2045 {
2046         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2047                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2048         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2049         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2050         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2051         return;
2052 }
2053 
2054 static int
2055 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2056                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2057 {
2058         int rc;
2059         struct smb2_query_info_req *req;
2060 
2061         cFYI(1, "Query FSInfo level %d", level);
2062 
2063         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2064                 return -EIO;
2065 
2066         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2067         if (rc)
2068                 return rc;
2069 
2070         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2071         req->FileInfoClass = level;
2072         req->PersistentFileId = persistent_fid;
2073         req->VolatileFileId = volatile_fid;
2074         /* 4 for rfc1002 length field and 1 for pad */
2075         req->InputBufferOffset =
2076                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2077         req->OutputBufferLength = cpu_to_le32(
2078                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2079 
2080         iov->iov_base = (char *)req;
2081         /* 4 for rfc1002 length field */
2082         iov->iov_len = get_rfc1002_length(req) + 4;
2083         return 0;
2084 }
2085 
2086 int
2087 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2088               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2089 {
2090         struct smb2_query_info_rsp *rsp = NULL;
2091         struct kvec iov;
2092         int rc = 0;
2093         int resp_buftype;
2094         struct cifs_ses *ses = tcon->ses;
2095         struct smb2_fs_full_size_info *info = NULL;
2096 
2097         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2098                                 sizeof(struct smb2_fs_full_size_info),
2099                                 persistent_fid, volatile_fid);
2100         if (rc)
2101                 return rc;
2102 
2103         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2104         if (rc) {
2105                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2106                 goto qinf_exit;
2107         }
2108         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2109 
2110         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2111                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2112         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2113                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2114                           sizeof(struct smb2_fs_full_size_info));
2115         if (!rc)
2116                 copy_fs_info_to_kstatfs(info, fsdata);
2117 
2118 qinf_exit:
2119         free_rsp_buf(resp_buftype, iov.iov_base);
2120         return rc;
2121 }
2122 
2123 int
2124 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2125            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2126            const __u32 num_lock, struct smb2_lock_element *buf)
2127 {
2128         int rc = 0;
2129         struct smb2_lock_req *req = NULL;
2130         struct kvec iov[2];
2131         int resp_buf_type;
2132         unsigned int count;
2133 
2134         cFYI(1, "smb2_lockv num lock %d", num_lock);
2135 
2136         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2137         if (rc)
2138                 return rc;
2139 
2140         req->hdr.ProcessId = cpu_to_le32(pid);
2141         req->LockCount = cpu_to_le16(num_lock);
2142 
2143         req->PersistentFileId = persist_fid;
2144         req->VolatileFileId = volatile_fid;
2145 
2146         count = num_lock * sizeof(struct smb2_lock_element);
2147         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2148 
2149         iov[0].iov_base = (char *)req;
2150         /* 4 for rfc1002 length field and count for all locks */
2151         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2152         iov[1].iov_base = (char *)buf;
2153         iov[1].iov_len = count;
2154 
2155         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2156         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2157         if (rc) {
2158                 cFYI(1, "Send error in smb2_lockv = %d", rc);
2159                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2160         }
2161 
2162         return rc;
2163 }
2164 
2165 int
2166 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2167           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2168           const __u64 length, const __u64 offset, const __u32 lock_flags,
2169           const bool wait)
2170 {
2171         struct smb2_lock_element lock;
2172 
2173         lock.Offset = cpu_to_le64(offset);
2174         lock.Length = cpu_to_le64(length);
2175         lock.Flags = cpu_to_le32(lock_flags);
2176         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2177                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2178 
2179         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2180 }
2181 
2182 int
2183 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2184                  __u8 *lease_key, const __le32 lease_state)
2185 {
2186         int rc;
2187         struct smb2_lease_ack *req = NULL;
2188 
2189         cFYI(1, "SMB2_lease_break");
2190         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2191 
2192         if (rc)
2193                 return rc;
2194 
2195         req->hdr.CreditRequest = cpu_to_le16(1);
2196         req->StructureSize = cpu_to_le16(36);
2197         inc_rfc1001_len(req, 12);
2198 
2199         memcpy(req->LeaseKey, lease_key, 16);
2200         req->LeaseState = lease_state;
2201 
2202         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2203         /* SMB2 buffer freed by function above */
2204 
2205         if (rc) {
2206                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2207                 cFYI(1, "Send error in Lease Break = %d", rc);
2208         }
2209 
2210         return rc;
2211 }
2212 

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