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Linux/fs/cifs/smb2pdu.c

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  1 /*
  2  *   fs/cifs/smb2pdu.c
  3  *
  4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
  5  *                 Etersoft, 2012
  6  *   Author(s): Steve French (sfrench@us.ibm.com)
  7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
  8  *
  9  *   Contains the routines for constructing the SMB2 PDUs themselves
 10  *
 11  *   This library is free software; you can redistribute it and/or modify
 12  *   it under the terms of the GNU Lesser General Public License as published
 13  *   by the Free Software Foundation; either version 2.1 of the License, or
 14  *   (at your option) any later version.
 15  *
 16  *   This library is distributed in the hope that it will be useful,
 17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 19  *   the GNU Lesser General Public License for more details.
 20  *
 21  *   You should have received a copy of the GNU Lesser General Public License
 22  *   along with this library; if not, write to the Free Software
 23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 24  */
 25 
 26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 27  /* Note that there are handle based routines which must be                   */
 28  /* treated slightly differently for reconnection purposes since we never     */
 29  /* want to reuse a stale file handle and only the caller knows the file info */
 30 
 31 #include <linux/fs.h>
 32 #include <linux/kernel.h>
 33 #include <linux/vfs.h>
 34 #include <linux/task_io_accounting_ops.h>
 35 #include <linux/uaccess.h>
 36 #include <linux/pagemap.h>
 37 #include <linux/xattr.h>
 38 #include "smb2pdu.h"
 39 #include "cifsglob.h"
 40 #include "cifsacl.h"
 41 #include "cifsproto.h"
 42 #include "smb2proto.h"
 43 #include "cifs_unicode.h"
 44 #include "cifs_debug.h"
 45 #include "ntlmssp.h"
 46 #include "smb2status.h"
 47 #include "smb2glob.h"
 48 #include "cifspdu.h"
 49 
 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         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
114         if ((tcon->ses) &&
115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
116                 hdr->CreditCharge = cpu_to_le16(1);
117         /* else CreditCharge MBZ */
118 
119         hdr->TreeId = tcon->tid;
120         /* Uid is not converted */
121         if (tcon->ses)
122                 hdr->SessionId = tcon->ses->Suid;
123 
124         /*
125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
126          * to pass the path on the Open SMB prefixed by \\server\share.
127          * Not sure when we would need to do the augmented path (if ever) and
128          * setting this flag breaks the SMB2 open operation since it is
129          * illegal to send an empty path name (without \\server\share prefix)
130          * when the DFS flag is set in the SMB open header. We could
131          * consider setting the flag on all operations other than open
132          * but it is safer to net set it for now.
133          */
134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
136 
137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
139 out:
140         pdu->StructureSize2 = cpu_to_le16(parmsize);
141         return;
142 }
143 
144 static int
145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
146 {
147         int rc = 0;
148         struct nls_table *nls_codepage;
149         struct cifs_ses *ses;
150         struct TCP_Server_Info *server;
151 
152         /*
153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
154          * check for tcp and smb session status done differently
155          * for those three - in the calling routine.
156          */
157         if (tcon == NULL)
158                 return rc;
159 
160         if (smb2_command == SMB2_TREE_CONNECT)
161                 return rc;
162 
163         if (tcon->tidStatus == CifsExiting) {
164                 /*
165                  * only tree disconnect, open, and write,
166                  * (and ulogoff which does not have tcon)
167                  * are allowed as we start force umount.
168                  */
169                 if ((smb2_command != SMB2_WRITE) &&
170                    (smb2_command != SMB2_CREATE) &&
171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
173                                  smb2_command);
174                         return -ENODEV;
175                 }
176         }
177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
178             (!tcon->ses->server))
179                 return -EIO;
180 
181         ses = tcon->ses;
182         server = ses->server;
183 
184         /*
185          * Give demultiplex thread up to 10 seconds to reconnect, should be
186          * greater than cifs socket timeout which is 7 seconds
187          */
188         while (server->tcpStatus == CifsNeedReconnect) {
189                 /*
190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
191                  * here since they are implicitly done when session drops.
192                  */
193                 switch (smb2_command) {
194                 /*
195                  * BB Should we keep oplock break and add flush to exceptions?
196                  */
197                 case SMB2_TREE_DISCONNECT:
198                 case SMB2_CANCEL:
199                 case SMB2_CLOSE:
200                 case SMB2_OPLOCK_BREAK:
201                         return -EAGAIN;
202                 }
203 
204                 wait_event_interruptible_timeout(server->response_q,
205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
206 
207                 /* are we still trying to reconnect? */
208                 if (server->tcpStatus != CifsNeedReconnect)
209                         break;
210 
211                 /*
212                  * on "soft" mounts we wait once. Hard mounts keep
213                  * retrying until process is killed or server comes
214                  * back on-line
215                  */
216                 if (!tcon->retry) {
217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
218                         return -EHOSTDOWN;
219                 }
220         }
221 
222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
223                 return rc;
224 
225         nls_codepage = load_nls_default();
226 
227         /*
228          * need to prevent multiple threads trying to simultaneously reconnect
229          * the same SMB session
230          */
231         mutex_lock(&tcon->ses->session_mutex);
232         rc = cifs_negotiate_protocol(0, tcon->ses);
233         if (!rc && tcon->ses->need_reconnect)
234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
235 
236         if (rc || !tcon->need_reconnect) {
237                 mutex_unlock(&tcon->ses->session_mutex);
238                 goto out;
239         }
240 
241         cifs_mark_open_files_invalid(tcon);
242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
243         mutex_unlock(&tcon->ses->session_mutex);
244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
245         if (rc)
246                 goto out;
247         atomic_inc(&tconInfoReconnectCount);
248         /*
249          * BB FIXME add code to check if wsize needs update due to negotiated
250          * smb buffer size shrinking.
251          */
252 out:
253         /*
254          * Check if handle based operation so we know whether we can continue
255          * or not without returning to caller to reset file handle.
256          */
257         /*
258          * BB Is flush done by server on drop of tcp session? Should we special
259          * case it and skip above?
260          */
261         switch (smb2_command) {
262         case SMB2_FLUSH:
263         case SMB2_READ:
264         case SMB2_WRITE:
265         case SMB2_LOCK:
266         case SMB2_IOCTL:
267         case SMB2_QUERY_DIRECTORY:
268         case SMB2_CHANGE_NOTIFY:
269         case SMB2_QUERY_INFO:
270         case SMB2_SET_INFO:
271                 return -EAGAIN;
272         }
273         unload_nls(nls_codepage);
274         return rc;
275 }
276 
277 /*
278  * Allocate and return pointer to an SMB request hdr, and set basic
279  * SMB information in the SMB header. If the return code is zero, this
280  * function must have filled in request_buf pointer.
281  */
282 static int
283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
284                 void **request_buf)
285 {
286         int rc = 0;
287 
288         rc = smb2_reconnect(smb2_command, tcon);
289         if (rc)
290                 return rc;
291 
292         /* BB eventually switch this to SMB2 specific small buf size */
293         *request_buf = cifs_small_buf_get();
294         if (*request_buf == NULL) {
295                 /* BB should we add a retry in here if not a writepage? */
296                 return -ENOMEM;
297         }
298 
299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
300 
301         if (tcon != NULL) {
302 #ifdef CONFIG_CIFS_STATS2
303                 uint16_t com_code = le16_to_cpu(smb2_command);
304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
305 #endif
306                 cifs_stats_inc(&tcon->num_smbs_sent);
307         }
308 
309         return rc;
310 }
311 
312 static void
313 free_rsp_buf(int resp_buftype, void *rsp)
314 {
315         if (resp_buftype == CIFS_SMALL_BUFFER)
316                 cifs_small_buf_release(rsp);
317         else if (resp_buftype == CIFS_LARGE_BUFFER)
318                 cifs_buf_release(rsp);
319 }
320 
321 
322 /*
323  *
324  *      SMB2 Worker functions follow:
325  *
326  *      The general structure of the worker functions is:
327  *      1) Call smb2_init (assembles SMB2 header)
328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
330  *      4) Decode SMB2 command specific fields in the fixed length area
331  *      5) Decode variable length data area (if any for this SMB2 command type)
332  *      6) Call free smb buffer
333  *      7) return
334  *
335  */
336 
337 int
338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
339 {
340         struct smb2_negotiate_req *req;
341         struct smb2_negotiate_rsp *rsp;
342         struct kvec iov[1];
343         int rc = 0;
344         int resp_buftype;
345         struct TCP_Server_Info *server = ses->server;
346         int blob_offset, blob_length;
347         char *security_blob;
348         int flags = CIFS_NEG_OP;
349 
350         cifs_dbg(FYI, "Negotiate protocol\n");
351 
352         if (!server) {
353                 WARN(1, "%s: server is NULL!\n", __func__);
354                 return -EIO;
355         }
356 
357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
358         if (rc)
359                 return rc;
360 
361         req->hdr.SessionId = 0;
362 
363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
364 
365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
366         inc_rfc1001_len(req, 2);
367 
368         /* only one of SMB2 signing flags may be set in SMB2 request */
369         if (ses->sign)
370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
371         else if (global_secflags & CIFSSEC_MAY_SIGN)
372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
373         else
374                 req->SecurityMode = 0;
375 
376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
377 
378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
379 
380         iov[0].iov_base = (char *)req;
381         /* 4 for rfc1002 length field */
382         iov[0].iov_len = get_rfc1002_length(req) + 4;
383 
384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
385 
386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
387         /*
388          * No tcon so can't do
389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
390          */
391         if (rc != 0)
392                 goto neg_exit;
393 
394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
395 
396         /* BB we may eventually want to match the negotiated vs. requested
397            dialect, even though we are only requesting one at a time */
398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
406         else {
407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
408                          le16_to_cpu(rsp->DialectRevision));
409                 rc = -EIO;
410                 goto neg_exit;
411         }
412         server->dialect = le16_to_cpu(rsp->DialectRevision);
413 
414         /* SMB2 only has an extended negflavor */
415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
416         /* set it to the maximum buffer size value we can send with 1 credit */
417         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
418                                SMB2_MAX_BUFFER_SIZE);
419         server->max_read = le32_to_cpu(rsp->MaxReadSize);
420         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
421         /* BB Do we need to validate the SecurityMode? */
422         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
423         server->capabilities = le32_to_cpu(rsp->Capabilities);
424         /* Internal types */
425         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
426 
427         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
428                                                &rsp->hdr);
429         /*
430          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
431          * for us will be
432          *      ses->sectype = RawNTLMSSP;
433          * but for time being this is our only auth choice so doesn't matter.
434          * We just found a server which sets blob length to zero expecting raw.
435          */
436         if (blob_length == 0)
437                 cifs_dbg(FYI, "missing security blob on negprot\n");
438 
439         rc = cifs_enable_signing(server, ses->sign);
440 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
441         if (rc)
442                 goto neg_exit;
443         if (blob_length)
444                 rc = decode_neg_token_init(security_blob, blob_length,
445                                    &server->sec_type);
446         if (rc == 1)
447                 rc = 0;
448         else if (rc == 0) {
449                 rc = -EIO;
450                 goto neg_exit;
451         }
452 #endif
453 
454 neg_exit:
455         free_rsp_buf(resp_buftype, rsp);
456         return rc;
457 }
458 
459 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
460 {
461         int rc = 0;
462         struct validate_negotiate_info_req vneg_inbuf;
463         struct validate_negotiate_info_rsp *pneg_rsp;
464         u32 rsplen;
465 
466         cifs_dbg(FYI, "validate negotiate\n");
467 
468         /*
469          * validation ioctl must be signed, so no point sending this if we
470          * can not sign it.  We could eventually change this to selectively
471          * sign just this, the first and only signed request on a connection.
472          * This is good enough for now since a user who wants better security
473          * would also enable signing on the mount. Having validation of
474          * negotiate info for signed connections helps reduce attack vectors
475          */
476         if (tcon->ses->server->sign == false)
477                 return 0; /* validation requires signing */
478 
479         vneg_inbuf.Capabilities =
480                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
481         memcpy(vneg_inbuf.Guid, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
482 
483         if (tcon->ses->sign)
484                 vneg_inbuf.SecurityMode =
485                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
486         else if (global_secflags & CIFSSEC_MAY_SIGN)
487                 vneg_inbuf.SecurityMode =
488                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
489         else
490                 vneg_inbuf.SecurityMode = 0;
491 
492         vneg_inbuf.DialectCount = cpu_to_le16(1);
493         vneg_inbuf.Dialects[0] =
494                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
495 
496         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
497                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
498                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
499                 (char **)&pneg_rsp, &rsplen);
500 
501         if (rc != 0) {
502                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
503                 return -EIO;
504         }
505 
506         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
507                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
508                 return -EIO;
509         }
510 
511         /* check validate negotiate info response matches what we got earlier */
512         if (pneg_rsp->Dialect !=
513                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
514                 goto vneg_out;
515 
516         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
517                 goto vneg_out;
518 
519         /* do not validate server guid because not saved at negprot time yet */
520 
521         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
522               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
523                 goto vneg_out;
524 
525         /* validate negotiate successful */
526         cifs_dbg(FYI, "validate negotiate info successful\n");
527         return 0;
528 
529 vneg_out:
530         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
531         return -EIO;
532 }
533 
534 int
535 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
536                 const struct nls_table *nls_cp)
537 {
538         struct smb2_sess_setup_req *req;
539         struct smb2_sess_setup_rsp *rsp = NULL;
540         struct kvec iov[2];
541         int rc = 0;
542         int resp_buftype;
543         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
544         struct TCP_Server_Info *server = ses->server;
545         u16 blob_length = 0;
546         char *security_blob;
547         char *ntlmssp_blob = NULL;
548         bool use_spnego = false; /* else use raw ntlmssp */
549 
550         cifs_dbg(FYI, "Session Setup\n");
551 
552         if (!server) {
553                 WARN(1, "%s: server is NULL!\n", __func__);
554                 return -EIO;
555         }
556 
557         /*
558          * If we are here due to reconnect, free per-smb session key
559          * in case signing was required.
560          */
561         kfree(ses->auth_key.response);
562         ses->auth_key.response = NULL;
563 
564         /*
565          * If memory allocation is successful, caller of this function
566          * frees it.
567          */
568         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
569         if (!ses->ntlmssp)
570                 return -ENOMEM;
571         ses->ntlmssp->sesskey_per_smbsess = true;
572 
573         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
574         ses->sectype = RawNTLMSSP;
575 
576 ssetup_ntlmssp_authenticate:
577         if (phase == NtLmChallenge)
578                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
579 
580         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
581         if (rc)
582                 return rc;
583 
584         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
585         req->VcNumber = 0; /* MBZ */
586         /* to enable echos and oplocks */
587         req->hdr.CreditRequest = cpu_to_le16(3);
588 
589         /* only one of SMB2 signing flags may be set in SMB2 request */
590         if (server->sign)
591                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
592         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
593                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
594         else
595                 req->SecurityMode = 0;
596 
597         req->Capabilities = 0;
598         req->Channel = 0; /* MBZ */
599 
600         iov[0].iov_base = (char *)req;
601         /* 4 for rfc1002 length field and 1 for pad */
602         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
603         if (phase == NtLmNegotiate) {
604                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
605                                        GFP_KERNEL);
606                 if (ntlmssp_blob == NULL) {
607                         rc = -ENOMEM;
608                         goto ssetup_exit;
609                 }
610                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
611                 if (use_spnego) {
612                         /* blob_length = build_spnego_ntlmssp_blob(
613                                         &security_blob,
614                                         sizeof(struct _NEGOTIATE_MESSAGE),
615                                         ntlmssp_blob); */
616                         /* BB eventually need to add this */
617                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
618                         rc = -EOPNOTSUPP;
619                         kfree(ntlmssp_blob);
620                         goto ssetup_exit;
621                 } else {
622                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
623                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
624                         security_blob = ntlmssp_blob;
625                 }
626         } else if (phase == NtLmAuthenticate) {
627                 req->hdr.SessionId = ses->Suid;
628                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
629                                        GFP_KERNEL);
630                 if (ntlmssp_blob == NULL) {
631                         rc = -ENOMEM;
632                         goto ssetup_exit;
633                 }
634                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
635                                              nls_cp);
636                 if (rc) {
637                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
638                                  rc);
639                         goto ssetup_exit; /* BB double check error handling */
640                 }
641                 if (use_spnego) {
642                         /* blob_length = build_spnego_ntlmssp_blob(
643                                                         &security_blob,
644                                                         blob_length,
645                                                         ntlmssp_blob); */
646                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
647                         rc = -EOPNOTSUPP;
648                         kfree(ntlmssp_blob);
649                         goto ssetup_exit;
650                 } else {
651                         security_blob = ntlmssp_blob;
652                 }
653         } else {
654                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
655                 rc = -EIO;
656                 goto ssetup_exit;
657         }
658 
659         /* Testing shows that buffer offset must be at location of Buffer[0] */
660         req->SecurityBufferOffset =
661                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
662                                             1 /* pad */ - 4 /* rfc1001 len */);
663         req->SecurityBufferLength = cpu_to_le16(blob_length);
664         iov[1].iov_base = security_blob;
665         iov[1].iov_len = blob_length;
666 
667         inc_rfc1001_len(req, blob_length - 1 /* pad */);
668 
669         /* BB add code to build os and lm fields */
670 
671         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
672                           CIFS_LOG_ERROR | CIFS_NEG_OP);
673 
674         kfree(security_blob);
675         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
676         if (resp_buftype != CIFS_NO_BUFFER &&
677             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
678                 if (phase != NtLmNegotiate) {
679                         cifs_dbg(VFS, "Unexpected more processing error\n");
680                         goto ssetup_exit;
681                 }
682                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
683                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
684                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
685                                  le16_to_cpu(rsp->SecurityBufferOffset));
686                         rc = -EIO;
687                         goto ssetup_exit;
688                 }
689 
690                 /* NTLMSSP Negotiate sent now processing challenge (response) */
691                 phase = NtLmChallenge; /* process ntlmssp challenge */
692                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
693                 ses->Suid = rsp->hdr.SessionId;
694                 rc = decode_ntlmssp_challenge(rsp->Buffer,
695                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
696         }
697 
698         /*
699          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
700          * but at least the raw NTLMSSP case works.
701          */
702         /*
703          * No tcon so can't do
704          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
705          */
706         if (rc != 0)
707                 goto ssetup_exit;
708 
709         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
710         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
711                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
712 ssetup_exit:
713         free_rsp_buf(resp_buftype, rsp);
714 
715         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
716         if ((phase == NtLmChallenge) && (rc == 0))
717                 goto ssetup_ntlmssp_authenticate;
718 
719         if (!rc) {
720                 mutex_lock(&server->srv_mutex);
721                 if (server->sign && server->ops->generate_signingkey) {
722                         rc = server->ops->generate_signingkey(ses);
723                         kfree(ses->auth_key.response);
724                         ses->auth_key.response = NULL;
725                         if (rc) {
726                                 cifs_dbg(FYI,
727                                         "SMB3 session key generation failed\n");
728                                 mutex_unlock(&server->srv_mutex);
729                                 goto keygen_exit;
730                         }
731                 }
732                 if (!server->session_estab) {
733                         server->sequence_number = 0x2;
734                         server->session_estab = true;
735                 }
736                 mutex_unlock(&server->srv_mutex);
737 
738                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
739                 spin_lock(&GlobalMid_Lock);
740                 ses->status = CifsGood;
741                 ses->need_reconnect = false;
742                 spin_unlock(&GlobalMid_Lock);
743         }
744 
745 keygen_exit:
746         if (!server->sign) {
747                 kfree(ses->auth_key.response);
748                 ses->auth_key.response = NULL;
749         }
750         kfree(ses->ntlmssp);
751 
752         return rc;
753 }
754 
755 int
756 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
757 {
758         struct smb2_logoff_req *req; /* response is also trivial struct */
759         int rc = 0;
760         struct TCP_Server_Info *server;
761 
762         cifs_dbg(FYI, "disconnect session %p\n", ses);
763 
764         if (ses && (ses->server))
765                 server = ses->server;
766         else
767                 return -EIO;
768 
769         /* no need to send SMB logoff if uid already closed due to reconnect */
770         if (ses->need_reconnect)
771                 goto smb2_session_already_dead;
772 
773         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
774         if (rc)
775                 return rc;
776 
777          /* since no tcon, smb2_init can not do this, so do here */
778         req->hdr.SessionId = ses->Suid;
779         if (server->sign)
780                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
781 
782         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
783         /*
784          * No tcon so can't do
785          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
786          */
787 
788 smb2_session_already_dead:
789         return rc;
790 }
791 
792 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
793 {
794         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
795 }
796 
797 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
798 
799 /* These are similar values to what Windows uses */
800 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
801 {
802         tcon->max_chunks = 256;
803         tcon->max_bytes_chunk = 1048576;
804         tcon->max_bytes_copy = 16777216;
805 }
806 
807 int
808 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
809           struct cifs_tcon *tcon, const struct nls_table *cp)
810 {
811         struct smb2_tree_connect_req *req;
812         struct smb2_tree_connect_rsp *rsp = NULL;
813         struct kvec iov[2];
814         int rc = 0;
815         int resp_buftype;
816         int unc_path_len;
817         struct TCP_Server_Info *server;
818         __le16 *unc_path = NULL;
819 
820         cifs_dbg(FYI, "TCON\n");
821 
822         if ((ses->server) && tree)
823                 server = ses->server;
824         else
825                 return -EIO;
826 
827         if (tcon && tcon->bad_network_name)
828                 return -ENOENT;
829 
830         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
831         if (unc_path == NULL)
832                 return -ENOMEM;
833 
834         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
835         unc_path_len *= 2;
836         if (unc_path_len < 2) {
837                 kfree(unc_path);
838                 return -EINVAL;
839         }
840 
841         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
842         if (rc) {
843                 kfree(unc_path);
844                 return rc;
845         }
846 
847         if (tcon == NULL) {
848                 /* since no tcon, smb2_init can not do this, so do here */
849                 req->hdr.SessionId = ses->Suid;
850                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
851                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
852         }
853 
854         iov[0].iov_base = (char *)req;
855         /* 4 for rfc1002 length field and 1 for pad */
856         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
857 
858         /* Testing shows that buffer offset must be at location of Buffer[0] */
859         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
860                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
861         req->PathLength = cpu_to_le16(unc_path_len - 2);
862         iov[1].iov_base = unc_path;
863         iov[1].iov_len = unc_path_len;
864 
865         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
866 
867         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
868         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
869 
870         if (rc != 0) {
871                 if (tcon) {
872                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
873                         tcon->need_reconnect = true;
874                 }
875                 goto tcon_error_exit;
876         }
877 
878         if (tcon == NULL) {
879                 ses->ipc_tid = rsp->hdr.TreeId;
880                 goto tcon_exit;
881         }
882 
883         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
884                 cifs_dbg(FYI, "connection to disk share\n");
885         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
886                 tcon->ipc = true;
887                 cifs_dbg(FYI, "connection to pipe share\n");
888         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
889                 tcon->print = true;
890                 cifs_dbg(FYI, "connection to printer\n");
891         } else {
892                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
893                 rc = -EOPNOTSUPP;
894                 goto tcon_error_exit;
895         }
896 
897         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
898         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
899         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
900         tcon->tidStatus = CifsGood;
901         tcon->need_reconnect = false;
902         tcon->tid = rsp->hdr.TreeId;
903         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
904 
905         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
906             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
907                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
908         init_copy_chunk_defaults(tcon);
909         if (tcon->ses->server->ops->validate_negotiate)
910                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
911 tcon_exit:
912         free_rsp_buf(resp_buftype, rsp);
913         kfree(unc_path);
914         return rc;
915 
916 tcon_error_exit:
917         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
918                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
919                 tcon->bad_network_name = true;
920         }
921         goto tcon_exit;
922 }
923 
924 int
925 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
926 {
927         struct smb2_tree_disconnect_req *req; /* response is trivial */
928         int rc = 0;
929         struct TCP_Server_Info *server;
930         struct cifs_ses *ses = tcon->ses;
931 
932         cifs_dbg(FYI, "Tree Disconnect\n");
933 
934         if (ses && (ses->server))
935                 server = ses->server;
936         else
937                 return -EIO;
938 
939         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
940                 return 0;
941 
942         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
943         if (rc)
944                 return rc;
945 
946         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
947         if (rc)
948                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
949 
950         return rc;
951 }
952 
953 
954 static struct create_durable *
955 create_durable_buf(void)
956 {
957         struct create_durable *buf;
958 
959         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
960         if (!buf)
961                 return NULL;
962 
963         buf->ccontext.DataOffset = cpu_to_le16(offsetof
964                                         (struct create_durable, Data));
965         buf->ccontext.DataLength = cpu_to_le32(16);
966         buf->ccontext.NameOffset = cpu_to_le16(offsetof
967                                 (struct create_durable, Name));
968         buf->ccontext.NameLength = cpu_to_le16(4);
969         buf->Name[0] = 'D';
970         buf->Name[1] = 'H';
971         buf->Name[2] = 'n';
972         buf->Name[3] = 'Q';
973         return buf;
974 }
975 
976 static struct create_durable *
977 create_reconnect_durable_buf(struct cifs_fid *fid)
978 {
979         struct create_durable *buf;
980 
981         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
982         if (!buf)
983                 return NULL;
984 
985         buf->ccontext.DataOffset = cpu_to_le16(offsetof
986                                         (struct create_durable, Data));
987         buf->ccontext.DataLength = cpu_to_le32(16);
988         buf->ccontext.NameOffset = cpu_to_le16(offsetof
989                                 (struct create_durable, Name));
990         buf->ccontext.NameLength = cpu_to_le16(4);
991         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
992         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
993         buf->Name[0] = 'D';
994         buf->Name[1] = 'H';
995         buf->Name[2] = 'n';
996         buf->Name[3] = 'C';
997         return buf;
998 }
999 
1000 static __u8
1001 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1002                   unsigned int *epoch)
1003 {
1004         char *data_offset;
1005         struct create_context *cc;
1006         unsigned int next = 0;
1007         char *name;
1008 
1009         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1010         cc = (struct create_context *)data_offset;
1011         do {
1012                 cc = (struct create_context *)((char *)cc + next);
1013                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1014                 if (le16_to_cpu(cc->NameLength) != 4 ||
1015                     strncmp(name, "RqLs", 4)) {
1016                         next = le32_to_cpu(cc->Next);
1017                         continue;
1018                 }
1019                 return server->ops->parse_lease_buf(cc, epoch);
1020         } while (next != 0);
1021 
1022         return 0;
1023 }
1024 
1025 static int
1026 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1027                   unsigned int *num_iovec, __u8 *oplock)
1028 {
1029         struct smb2_create_req *req = iov[0].iov_base;
1030         unsigned int num = *num_iovec;
1031 
1032         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1033         if (iov[num].iov_base == NULL)
1034                 return -ENOMEM;
1035         iov[num].iov_len = server->vals->create_lease_size;
1036         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1037         if (!req->CreateContextsOffset)
1038                 req->CreateContextsOffset = cpu_to_le32(
1039                                 sizeof(struct smb2_create_req) - 4 +
1040                                 iov[num - 1].iov_len);
1041         le32_add_cpu(&req->CreateContextsLength,
1042                      server->vals->create_lease_size);
1043         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1044         *num_iovec = num + 1;
1045         return 0;
1046 }
1047 
1048 static int
1049 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1050                     struct cifs_open_parms *oparms)
1051 {
1052         struct smb2_create_req *req = iov[0].iov_base;
1053         unsigned int num = *num_iovec;
1054 
1055         if (oparms->reconnect) {
1056                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1057                 /* indicate that we don't need to relock the file */
1058                 oparms->reconnect = false;
1059         } else
1060                 iov[num].iov_base = create_durable_buf();
1061         if (iov[num].iov_base == NULL)
1062                 return -ENOMEM;
1063         iov[num].iov_len = sizeof(struct create_durable);
1064         if (!req->CreateContextsOffset)
1065                 req->CreateContextsOffset =
1066                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1067                                                                 iov[1].iov_len);
1068         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1069         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1070         *num_iovec = num + 1;
1071         return 0;
1072 }
1073 
1074 int
1075 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1076           __u8 *oplock, struct smb2_file_all_info *buf,
1077           struct smb2_err_rsp **err_buf)
1078 {
1079         struct smb2_create_req *req;
1080         struct smb2_create_rsp *rsp;
1081         struct TCP_Server_Info *server;
1082         struct cifs_tcon *tcon = oparms->tcon;
1083         struct cifs_ses *ses = tcon->ses;
1084         struct kvec iov[4];
1085         int resp_buftype;
1086         int uni_path_len;
1087         __le16 *copy_path = NULL;
1088         int copy_size;
1089         int rc = 0;
1090         unsigned int num_iovecs = 2;
1091         __u32 file_attributes = 0;
1092 
1093         cifs_dbg(FYI, "create/open\n");
1094 
1095         if (ses && (ses->server))
1096                 server = ses->server;
1097         else
1098                 return -EIO;
1099 
1100         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1101         if (rc)
1102                 return rc;
1103 
1104         if (oparms->create_options & CREATE_OPTION_READONLY)
1105                 file_attributes |= ATTR_READONLY;
1106 
1107         req->ImpersonationLevel = IL_IMPERSONATION;
1108         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1109         /* File attributes ignored on open (used in create though) */
1110         req->FileAttributes = cpu_to_le32(file_attributes);
1111         req->ShareAccess = FILE_SHARE_ALL_LE;
1112         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1113         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1114         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1115         /* do not count rfc1001 len field */
1116         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1117 
1118         iov[0].iov_base = (char *)req;
1119         /* 4 for rfc1002 length field */
1120         iov[0].iov_len = get_rfc1002_length(req) + 4;
1121 
1122         /* MUST set path len (NameLength) to 0 opening root of share */
1123         req->NameLength = cpu_to_le16(uni_path_len - 2);
1124         /* -1 since last byte is buf[0] which is sent below (path) */
1125         iov[0].iov_len--;
1126         if (uni_path_len % 8 != 0) {
1127                 copy_size = uni_path_len / 8 * 8;
1128                 if (copy_size < uni_path_len)
1129                         copy_size += 8;
1130 
1131                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1132                 if (!copy_path)
1133                         return -ENOMEM;
1134                 memcpy((char *)copy_path, (const char *)path,
1135                         uni_path_len);
1136                 uni_path_len = copy_size;
1137                 path = copy_path;
1138         }
1139 
1140         iov[1].iov_len = uni_path_len;
1141         iov[1].iov_base = path;
1142         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1143         inc_rfc1001_len(req, uni_path_len - 1);
1144 
1145         if (!server->oplocks)
1146                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1147 
1148         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1149             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1150                 req->RequestedOplockLevel = *oplock;
1151         else {
1152                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1153                 if (rc) {
1154                         cifs_small_buf_release(req);
1155                         kfree(copy_path);
1156                         return rc;
1157                 }
1158         }
1159 
1160         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1161                 /* need to set Next field of lease context if we request it */
1162                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1163                         struct create_context *ccontext =
1164                             (struct create_context *)iov[num_iovecs-1].iov_base;
1165                         ccontext->Next =
1166                                 cpu_to_le32(server->vals->create_lease_size);
1167                 }
1168                 rc = add_durable_context(iov, &num_iovecs, oparms);
1169                 if (rc) {
1170                         cifs_small_buf_release(req);
1171                         kfree(copy_path);
1172                         kfree(iov[num_iovecs-1].iov_base);
1173                         return rc;
1174                 }
1175         }
1176 
1177         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1178         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1179 
1180         if (rc != 0) {
1181                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1182                 if (err_buf)
1183                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1184                                            GFP_KERNEL);
1185                 goto creat_exit;
1186         }
1187 
1188         oparms->fid->persistent_fid = rsp->PersistentFileId;
1189         oparms->fid->volatile_fid = rsp->VolatileFileId;
1190 
1191         if (buf) {
1192                 memcpy(buf, &rsp->CreationTime, 32);
1193                 buf->AllocationSize = rsp->AllocationSize;
1194                 buf->EndOfFile = rsp->EndofFile;
1195                 buf->Attributes = rsp->FileAttributes;
1196                 buf->NumberOfLinks = cpu_to_le32(1);
1197                 buf->DeletePending = 0;
1198         }
1199 
1200         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1201                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1202         else
1203                 *oplock = rsp->OplockLevel;
1204 creat_exit:
1205         kfree(copy_path);
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 = tcon->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         *out_data = NULL;
1230         /* zero out returned data len, in case of error */
1231         if (plen)
1232                 *plen = 0;
1233 
1234         if (ses && (ses->server))
1235                 server = ses->server;
1236         else
1237                 return -EIO;
1238 
1239         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1240         if (rc)
1241                 return rc;
1242 
1243         req->CtlCode = cpu_to_le32(opcode);
1244         req->PersistentFileId = persistent_fid;
1245         req->VolatileFileId = volatile_fid;
1246 
1247         if (indatalen) {
1248                 req->InputCount = cpu_to_le32(indatalen);
1249                 /* do not set InputOffset if no input data */
1250                 req->InputOffset =
1251                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1252                 iov[1].iov_base = in_data;
1253                 iov[1].iov_len = indatalen;
1254                 num_iovecs = 2;
1255         } else
1256                 num_iovecs = 1;
1257 
1258         req->OutputOffset = 0;
1259         req->OutputCount = 0; /* MBZ */
1260 
1261         /*
1262          * Could increase MaxOutputResponse, but that would require more
1263          * than one credit. Windows typically sets this smaller, but for some
1264          * ioctls it may be useful to allow server to send more. No point
1265          * limiting what the server can send as long as fits in one credit
1266          */
1267         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1268 
1269         if (is_fsctl)
1270                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1271         else
1272                 req->Flags = 0;
1273 
1274         iov[0].iov_base = (char *)req;
1275 
1276         /*
1277          * If no input data, the size of ioctl struct in
1278          * protocol spec still includes a 1 byte data buffer,
1279          * but if input data passed to ioctl, we do not
1280          * want to double count this, so we do not send
1281          * the dummy one byte of data in iovec[0] if sending
1282          * input data (in iovec[1]). We also must add 4 bytes
1283          * in first iovec to allow for rfc1002 length field.
1284          */
1285 
1286         if (indatalen) {
1287                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1288                 inc_rfc1001_len(req, indatalen - 1);
1289         } else
1290                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1291 
1292 
1293         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1294         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1295 
1296         if ((rc != 0) && (rc != -EINVAL)) {
1297                 if (tcon)
1298                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1299                 goto ioctl_exit;
1300         } else if (rc == -EINVAL) {
1301                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1302                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1303                         if (tcon)
1304                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1305                         goto ioctl_exit;
1306                 }
1307         }
1308 
1309         /* check if caller wants to look at return data or just return rc */
1310         if ((plen == NULL) || (out_data == NULL))
1311                 goto ioctl_exit;
1312 
1313         *plen = le32_to_cpu(rsp->OutputCount);
1314 
1315         /* We check for obvious errors in the output buffer length and offset */
1316         if (*plen == 0)
1317                 goto ioctl_exit; /* server returned no data */
1318         else if (*plen > 0xFF00) {
1319                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1320                 *plen = 0;
1321                 rc = -EIO;
1322                 goto ioctl_exit;
1323         }
1324 
1325         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1326                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1327                         le32_to_cpu(rsp->OutputOffset));
1328                 *plen = 0;
1329                 rc = -EIO;
1330                 goto ioctl_exit;
1331         }
1332 
1333         *out_data = kmalloc(*plen, GFP_KERNEL);
1334         if (*out_data == NULL) {
1335                 rc = -ENOMEM;
1336                 goto ioctl_exit;
1337         }
1338 
1339         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1340                *plen);
1341 ioctl_exit:
1342         free_rsp_buf(resp_buftype, rsp);
1343         return rc;
1344 }
1345 
1346 /*
1347  *   Individual callers to ioctl worker function follow
1348  */
1349 
1350 int
1351 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1352                      u64 persistent_fid, u64 volatile_fid)
1353 {
1354         int rc;
1355         char *res_key = NULL;
1356         struct  compress_ioctl fsctl_input;
1357         char *ret_data = NULL;
1358 
1359         fsctl_input.CompressionState =
1360                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1361 
1362         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1363                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1364                         (char *)&fsctl_input /* data input */,
1365                         2 /* in data len */, &ret_data /* out data */, NULL);
1366 
1367         cifs_dbg(FYI, "set compression rc %d\n", rc);
1368         kfree(res_key);
1369 
1370         return rc;
1371 }
1372 
1373 int
1374 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1375            u64 persistent_fid, u64 volatile_fid)
1376 {
1377         struct smb2_close_req *req;
1378         struct smb2_close_rsp *rsp;
1379         struct TCP_Server_Info *server;
1380         struct cifs_ses *ses = tcon->ses;
1381         struct kvec iov[1];
1382         int resp_buftype;
1383         int rc = 0;
1384 
1385         cifs_dbg(FYI, "Close\n");
1386 
1387         if (ses && (ses->server))
1388                 server = ses->server;
1389         else
1390                 return -EIO;
1391 
1392         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1393         if (rc)
1394                 return rc;
1395 
1396         req->PersistentFileId = persistent_fid;
1397         req->VolatileFileId = volatile_fid;
1398 
1399         iov[0].iov_base = (char *)req;
1400         /* 4 for rfc1002 length field */
1401         iov[0].iov_len = get_rfc1002_length(req) + 4;
1402 
1403         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1404         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1405 
1406         if (rc != 0) {
1407                 if (tcon)
1408                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1409                 goto close_exit;
1410         }
1411 
1412         /* BB FIXME - decode close response, update inode for caching */
1413 
1414 close_exit:
1415         free_rsp_buf(resp_buftype, rsp);
1416         return rc;
1417 }
1418 
1419 static int
1420 validate_buf(unsigned int offset, unsigned int buffer_length,
1421              struct smb2_hdr *hdr, unsigned int min_buf_size)
1422 
1423 {
1424         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1425         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1426         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1427         char *end_of_buf = begin_of_buf + buffer_length;
1428 
1429 
1430         if (buffer_length < min_buf_size) {
1431                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1432                          buffer_length, min_buf_size);
1433                 return -EINVAL;
1434         }
1435 
1436         /* check if beyond RFC1001 maximum length */
1437         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1438                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1439                          buffer_length, smb_len);
1440                 return -EINVAL;
1441         }
1442 
1443         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1444                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1445                 return -EINVAL;
1446         }
1447 
1448         return 0;
1449 }
1450 
1451 /*
1452  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1453  * Caller must free buffer.
1454  */
1455 static int
1456 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1457                       struct smb2_hdr *hdr, unsigned int minbufsize,
1458                       char *data)
1459 
1460 {
1461         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1462         int rc;
1463 
1464         if (!data)
1465                 return -EINVAL;
1466 
1467         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1468         if (rc)
1469                 return rc;
1470 
1471         memcpy(data, begin_of_buf, buffer_length);
1472 
1473         return 0;
1474 }
1475 
1476 static int
1477 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1478            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1479            size_t output_len, size_t min_len, void *data)
1480 {
1481         struct smb2_query_info_req *req;
1482         struct smb2_query_info_rsp *rsp = NULL;
1483         struct kvec iov[2];
1484         int rc = 0;
1485         int resp_buftype;
1486         struct TCP_Server_Info *server;
1487         struct cifs_ses *ses = tcon->ses;
1488 
1489         cifs_dbg(FYI, "Query Info\n");
1490 
1491         if (ses && (ses->server))
1492                 server = ses->server;
1493         else
1494                 return -EIO;
1495 
1496         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1497         if (rc)
1498                 return rc;
1499 
1500         req->InfoType = SMB2_O_INFO_FILE;
1501         req->FileInfoClass = info_class;
1502         req->PersistentFileId = persistent_fid;
1503         req->VolatileFileId = volatile_fid;
1504         /* 4 for rfc1002 length field and 1 for Buffer */
1505         req->InputBufferOffset =
1506                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1507         req->OutputBufferLength = cpu_to_le32(output_len);
1508 
1509         iov[0].iov_base = (char *)req;
1510         /* 4 for rfc1002 length field */
1511         iov[0].iov_len = get_rfc1002_length(req) + 4;
1512 
1513         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1514         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1515 
1516         if (rc) {
1517                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1518                 goto qinf_exit;
1519         }
1520 
1521         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1522                                    le32_to_cpu(rsp->OutputBufferLength),
1523                                    &rsp->hdr, min_len, data);
1524 
1525 qinf_exit:
1526         free_rsp_buf(resp_buftype, rsp);
1527         return rc;
1528 }
1529 
1530 int
1531 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1532                 u64 persistent_fid, u64 volatile_fid,
1533                 struct smb2_file_all_info *data)
1534 {
1535         return query_info(xid, tcon, persistent_fid, volatile_fid,
1536                           FILE_ALL_INFORMATION,
1537                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1538                           sizeof(struct smb2_file_all_info), data);
1539 }
1540 
1541 int
1542 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1543                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1544 {
1545         return query_info(xid, tcon, persistent_fid, volatile_fid,
1546                           FILE_INTERNAL_INFORMATION,
1547                           sizeof(struct smb2_file_internal_info),
1548                           sizeof(struct smb2_file_internal_info), uniqueid);
1549 }
1550 
1551 /*
1552  * This is a no-op for now. We're not really interested in the reply, but
1553  * rather in the fact that the server sent one and that server->lstrp
1554  * gets updated.
1555  *
1556  * FIXME: maybe we should consider checking that the reply matches request?
1557  */
1558 static void
1559 smb2_echo_callback(struct mid_q_entry *mid)
1560 {
1561         struct TCP_Server_Info *server = mid->callback_data;
1562         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1563         unsigned int credits_received = 1;
1564 
1565         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1566                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1567 
1568         DeleteMidQEntry(mid);
1569         add_credits(server, credits_received, CIFS_ECHO_OP);
1570 }
1571 
1572 int
1573 SMB2_echo(struct TCP_Server_Info *server)
1574 {
1575         struct smb2_echo_req *req;
1576         int rc = 0;
1577         struct kvec iov;
1578         struct smb_rqst rqst = { .rq_iov = &iov,
1579                                  .rq_nvec = 1 };
1580 
1581         cifs_dbg(FYI, "In echo request\n");
1582 
1583         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1584         if (rc)
1585                 return rc;
1586 
1587         req->hdr.CreditRequest = cpu_to_le16(1);
1588 
1589         iov.iov_base = (char *)req;
1590         /* 4 for rfc1002 length field */
1591         iov.iov_len = get_rfc1002_length(req) + 4;
1592 
1593         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1594                              CIFS_ECHO_OP);
1595         if (rc)
1596                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1597 
1598         cifs_small_buf_release(req);
1599         return rc;
1600 }
1601 
1602 int
1603 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1604            u64 volatile_fid)
1605 {
1606         struct smb2_flush_req *req;
1607         struct TCP_Server_Info *server;
1608         struct cifs_ses *ses = tcon->ses;
1609         struct kvec iov[1];
1610         int resp_buftype;
1611         int rc = 0;
1612 
1613         cifs_dbg(FYI, "Flush\n");
1614 
1615         if (ses && (ses->server))
1616                 server = ses->server;
1617         else
1618                 return -EIO;
1619 
1620         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1621         if (rc)
1622                 return rc;
1623 
1624         req->PersistentFileId = persistent_fid;
1625         req->VolatileFileId = volatile_fid;
1626 
1627         iov[0].iov_base = (char *)req;
1628         /* 4 for rfc1002 length field */
1629         iov[0].iov_len = get_rfc1002_length(req) + 4;
1630 
1631         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1632 
1633         if ((rc != 0) && tcon)
1634                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1635 
1636         free_rsp_buf(resp_buftype, iov[0].iov_base);
1637         return rc;
1638 }
1639 
1640 /*
1641  * To form a chain of read requests, any read requests after the first should
1642  * have the end_of_chain boolean set to true.
1643  */
1644 static int
1645 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1646                   unsigned int remaining_bytes, int request_type)
1647 {
1648         int rc = -EACCES;
1649         struct smb2_read_req *req = NULL;
1650 
1651         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1652         if (rc)
1653                 return rc;
1654         if (io_parms->tcon->ses->server == NULL)
1655                 return -ECONNABORTED;
1656 
1657         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1658 
1659         req->PersistentFileId = io_parms->persistent_fid;
1660         req->VolatileFileId = io_parms->volatile_fid;
1661         req->ReadChannelInfoOffset = 0; /* reserved */
1662         req->ReadChannelInfoLength = 0; /* reserved */
1663         req->Channel = 0; /* reserved */
1664         req->MinimumCount = 0;
1665         req->Length = cpu_to_le32(io_parms->length);
1666         req->Offset = cpu_to_le64(io_parms->offset);
1667 
1668         if (request_type & CHAINED_REQUEST) {
1669                 if (!(request_type & END_OF_CHAIN)) {
1670                         /* 4 for rfc1002 length field */
1671                         req->hdr.NextCommand =
1672                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1673                 } else /* END_OF_CHAIN */
1674                         req->hdr.NextCommand = 0;
1675                 if (request_type & RELATED_REQUEST) {
1676                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1677                         /*
1678                          * Related requests use info from previous read request
1679                          * in chain.
1680                          */
1681                         req->hdr.SessionId = 0xFFFFFFFF;
1682                         req->hdr.TreeId = 0xFFFFFFFF;
1683                         req->PersistentFileId = 0xFFFFFFFF;
1684                         req->VolatileFileId = 0xFFFFFFFF;
1685                 }
1686         }
1687         if (remaining_bytes > io_parms->length)
1688                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1689         else
1690                 req->RemainingBytes = 0;
1691 
1692         iov[0].iov_base = (char *)req;
1693         /* 4 for rfc1002 length field */
1694         iov[0].iov_len = get_rfc1002_length(req) + 4;
1695         return rc;
1696 }
1697 
1698 static void
1699 smb2_readv_callback(struct mid_q_entry *mid)
1700 {
1701         struct cifs_readdata *rdata = mid->callback_data;
1702         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1703         struct TCP_Server_Info *server = tcon->ses->server;
1704         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1705         unsigned int credits_received = 1;
1706         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1707                                  .rq_nvec = 1,
1708                                  .rq_pages = rdata->pages,
1709                                  .rq_npages = rdata->nr_pages,
1710                                  .rq_pagesz = rdata->pagesz,
1711                                  .rq_tailsz = rdata->tailsz };
1712 
1713         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1714                  __func__, mid->mid, mid->mid_state, rdata->result,
1715                  rdata->bytes);
1716 
1717         switch (mid->mid_state) {
1718         case MID_RESPONSE_RECEIVED:
1719                 credits_received = le16_to_cpu(buf->CreditRequest);
1720                 /* result already set, check signature */
1721                 if (server->sign) {
1722                         int rc;
1723 
1724                         rc = smb2_verify_signature(&rqst, server);
1725                         if (rc)
1726                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1727                                          rc);
1728                 }
1729                 /* FIXME: should this be counted toward the initiating task? */
1730                 task_io_account_read(rdata->bytes);
1731                 cifs_stats_bytes_read(tcon, rdata->bytes);
1732                 break;
1733         case MID_REQUEST_SUBMITTED:
1734         case MID_RETRY_NEEDED:
1735                 rdata->result = -EAGAIN;
1736                 break;
1737         default:
1738                 if (rdata->result != -ENODATA)
1739                         rdata->result = -EIO;
1740         }
1741 
1742         if (rdata->result)
1743                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1744 
1745         queue_work(cifsiod_wq, &rdata->work);
1746         DeleteMidQEntry(mid);
1747         add_credits(server, credits_received, 0);
1748 }
1749 
1750 /* smb2_async_readv - send an async write, and set up mid to handle result */
1751 int
1752 smb2_async_readv(struct cifs_readdata *rdata)
1753 {
1754         int rc;
1755         struct smb2_hdr *buf;
1756         struct cifs_io_parms io_parms;
1757         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1758                                  .rq_nvec = 1 };
1759 
1760         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1761                  __func__, rdata->offset, rdata->bytes);
1762 
1763         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1764         io_parms.offset = rdata->offset;
1765         io_parms.length = rdata->bytes;
1766         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1767         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1768         io_parms.pid = rdata->pid;
1769         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1770         if (rc)
1771                 return rc;
1772 
1773         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1774         /* 4 for rfc1002 length field */
1775         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1776 
1777         kref_get(&rdata->refcount);
1778         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1779                              cifs_readv_receive, smb2_readv_callback,
1780                              rdata, 0);
1781         if (rc) {
1782                 kref_put(&rdata->refcount, cifs_readdata_release);
1783                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1784         }
1785 
1786         cifs_small_buf_release(buf);
1787         return rc;
1788 }
1789 
1790 int
1791 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1792           unsigned int *nbytes, char **buf, int *buf_type)
1793 {
1794         int resp_buftype, rc = -EACCES;
1795         struct smb2_read_rsp *rsp = NULL;
1796         struct kvec iov[1];
1797 
1798         *nbytes = 0;
1799         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1800         if (rc)
1801                 return rc;
1802 
1803         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1804                           &resp_buftype, CIFS_LOG_ERROR);
1805 
1806         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1807 
1808         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1809                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1810                 return 0;
1811         }
1812 
1813         if (rc) {
1814                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1815                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1816         } else {
1817                 *nbytes = le32_to_cpu(rsp->DataLength);
1818                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1819                     (*nbytes > io_parms->length)) {
1820                         cifs_dbg(FYI, "bad length %d for count %d\n",
1821                                  *nbytes, io_parms->length);
1822                         rc = -EIO;
1823                         *nbytes = 0;
1824                 }
1825         }
1826 
1827         if (*buf) {
1828                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1829                        *nbytes);
1830                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1831         } else if (resp_buftype != CIFS_NO_BUFFER) {
1832                 *buf = iov[0].iov_base;
1833                 if (resp_buftype == CIFS_SMALL_BUFFER)
1834                         *buf_type = CIFS_SMALL_BUFFER;
1835                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1836                         *buf_type = CIFS_LARGE_BUFFER;
1837         }
1838         return rc;
1839 }
1840 
1841 /*
1842  * Check the mid_state and signature on received buffer (if any), and queue the
1843  * workqueue completion task.
1844  */
1845 static void
1846 smb2_writev_callback(struct mid_q_entry *mid)
1847 {
1848         struct cifs_writedata *wdata = mid->callback_data;
1849         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1850         unsigned int written;
1851         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1852         unsigned int credits_received = 1;
1853 
1854         switch (mid->mid_state) {
1855         case MID_RESPONSE_RECEIVED:
1856                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1857                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1858                 if (wdata->result != 0)
1859                         break;
1860 
1861                 written = le32_to_cpu(rsp->DataLength);
1862                 /*
1863                  * Mask off high 16 bits when bytes written as returned
1864                  * by the server is greater than bytes requested by the
1865                  * client. OS/2 servers are known to set incorrect
1866                  * CountHigh values.
1867                  */
1868                 if (written > wdata->bytes)
1869                         written &= 0xFFFF;
1870 
1871                 if (written < wdata->bytes)
1872                         wdata->result = -ENOSPC;
1873                 else
1874                         wdata->bytes = written;
1875                 break;
1876         case MID_REQUEST_SUBMITTED:
1877         case MID_RETRY_NEEDED:
1878                 wdata->result = -EAGAIN;
1879                 break;
1880         default:
1881                 wdata->result = -EIO;
1882                 break;
1883         }
1884 
1885         if (wdata->result)
1886                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1887 
1888         queue_work(cifsiod_wq, &wdata->work);
1889         DeleteMidQEntry(mid);
1890         add_credits(tcon->ses->server, credits_received, 0);
1891 }
1892 
1893 /* smb2_async_writev - send an async write, and set up mid to handle result */
1894 int
1895 smb2_async_writev(struct cifs_writedata *wdata)
1896 {
1897         int rc = -EACCES;
1898         struct smb2_write_req *req = NULL;
1899         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1900         struct kvec iov;
1901         struct smb_rqst rqst;
1902 
1903         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1904         if (rc)
1905                 goto async_writev_out;
1906 
1907         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1908 
1909         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1910         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1911         req->WriteChannelInfoOffset = 0;
1912         req->WriteChannelInfoLength = 0;
1913         req->Channel = 0;
1914         req->Offset = cpu_to_le64(wdata->offset);
1915         /* 4 for rfc1002 length field */
1916         req->DataOffset = cpu_to_le16(
1917                                 offsetof(struct smb2_write_req, Buffer) - 4);
1918         req->RemainingBytes = 0;
1919 
1920         /* 4 for rfc1002 length field and 1 for Buffer */
1921         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1922         iov.iov_base = req;
1923 
1924         rqst.rq_iov = &iov;
1925         rqst.rq_nvec = 1;
1926         rqst.rq_pages = wdata->pages;
1927         rqst.rq_npages = wdata->nr_pages;
1928         rqst.rq_pagesz = wdata->pagesz;
1929         rqst.rq_tailsz = wdata->tailsz;
1930 
1931         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1932                  wdata->offset, wdata->bytes);
1933 
1934         req->Length = cpu_to_le32(wdata->bytes);
1935 
1936         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1937 
1938         kref_get(&wdata->refcount);
1939         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1940                                 smb2_writev_callback, wdata, 0);
1941 
1942         if (rc) {
1943                 kref_put(&wdata->refcount, cifs_writedata_release);
1944                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1945         }
1946 
1947 async_writev_out:
1948         cifs_small_buf_release(req);
1949         return rc;
1950 }
1951 
1952 /*
1953  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1954  * The length field from io_parms must be at least 1 and indicates a number of
1955  * elements with data to write that begins with position 1 in iov array. All
1956  * data length is specified by count.
1957  */
1958 int
1959 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1960            unsigned int *nbytes, struct kvec *iov, int n_vec)
1961 {
1962         int rc = 0;
1963         struct smb2_write_req *req = NULL;
1964         struct smb2_write_rsp *rsp = NULL;
1965         int resp_buftype;
1966         *nbytes = 0;
1967 
1968         if (n_vec < 1)
1969                 return rc;
1970 
1971         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1972         if (rc)
1973                 return rc;
1974 
1975         if (io_parms->tcon->ses->server == NULL)
1976                 return -ECONNABORTED;
1977 
1978         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1979 
1980         req->PersistentFileId = io_parms->persistent_fid;
1981         req->VolatileFileId = io_parms->volatile_fid;
1982         req->WriteChannelInfoOffset = 0;
1983         req->WriteChannelInfoLength = 0;
1984         req->Channel = 0;
1985         req->Length = cpu_to_le32(io_parms->length);
1986         req->Offset = cpu_to_le64(io_parms->offset);
1987         /* 4 for rfc1002 length field */
1988         req->DataOffset = cpu_to_le16(
1989                                 offsetof(struct smb2_write_req, Buffer) - 4);
1990         req->RemainingBytes = 0;
1991 
1992         iov[0].iov_base = (char *)req;
1993         /* 4 for rfc1002 length field and 1 for Buffer */
1994         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1995 
1996         /* length of entire message including data to be written */
1997         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1998 
1999         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2000                           &resp_buftype, 0);
2001         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2002 
2003         if (rc) {
2004                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2005                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2006         } else
2007                 *nbytes = le32_to_cpu(rsp->DataLength);
2008 
2009         free_rsp_buf(resp_buftype, rsp);
2010         return rc;
2011 }
2012 
2013 static unsigned int
2014 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2015 {
2016         int len;
2017         unsigned int entrycount = 0;
2018         unsigned int next_offset = 0;
2019         FILE_DIRECTORY_INFO *entryptr;
2020 
2021         if (bufstart == NULL)
2022                 return 0;
2023 
2024         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2025 
2026         while (1) {
2027                 entryptr = (FILE_DIRECTORY_INFO *)
2028                                         ((char *)entryptr + next_offset);
2029 
2030                 if ((char *)entryptr + size > end_of_buf) {
2031                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2032                         break;
2033                 }
2034 
2035                 len = le32_to_cpu(entryptr->FileNameLength);
2036                 if ((char *)entryptr + len + size > end_of_buf) {
2037                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2038                                  end_of_buf);
2039                         break;
2040                 }
2041 
2042                 *lastentry = (char *)entryptr;
2043                 entrycount++;
2044 
2045                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2046                 if (!next_offset)
2047                         break;
2048         }
2049 
2050         return entrycount;
2051 }
2052 
2053 /*
2054  * Readdir/FindFirst
2055  */
2056 int
2057 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2058                      u64 persistent_fid, u64 volatile_fid, int index,
2059                      struct cifs_search_info *srch_inf)
2060 {
2061         struct smb2_query_directory_req *req;
2062         struct smb2_query_directory_rsp *rsp = NULL;
2063         struct kvec iov[2];
2064         int rc = 0;
2065         int len;
2066         int resp_buftype;
2067         unsigned char *bufptr;
2068         struct TCP_Server_Info *server;
2069         struct cifs_ses *ses = tcon->ses;
2070         __le16 asteriks = cpu_to_le16('*');
2071         char *end_of_smb;
2072         unsigned int output_size = CIFSMaxBufSize;
2073         size_t info_buf_size;
2074 
2075         if (ses && (ses->server))
2076                 server = ses->server;
2077         else
2078                 return -EIO;
2079 
2080         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2081         if (rc)
2082                 return rc;
2083 
2084         switch (srch_inf->info_level) {
2085         case SMB_FIND_FILE_DIRECTORY_INFO:
2086                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2087                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2088                 break;
2089         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2090                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2091                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2092                 break;
2093         default:
2094                 cifs_dbg(VFS, "info level %u isn't supported\n",
2095                          srch_inf->info_level);
2096                 rc = -EINVAL;
2097                 goto qdir_exit;
2098         }
2099 
2100         req->FileIndex = cpu_to_le32(index);
2101         req->PersistentFileId = persistent_fid;
2102         req->VolatileFileId = volatile_fid;
2103 
2104         len = 0x2;
2105         bufptr = req->Buffer;
2106         memcpy(bufptr, &asteriks, len);
2107 
2108         req->FileNameOffset =
2109                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2110         req->FileNameLength = cpu_to_le16(len);
2111         /*
2112          * BB could be 30 bytes or so longer if we used SMB2 specific
2113          * buffer lengths, but this is safe and close enough.
2114          */
2115         output_size = min_t(unsigned int, output_size, server->maxBuf);
2116         output_size = min_t(unsigned int, output_size, 2 << 15);
2117         req->OutputBufferLength = cpu_to_le32(output_size);
2118 
2119         iov[0].iov_base = (char *)req;
2120         /* 4 for RFC1001 length and 1 for Buffer */
2121         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2122 
2123         iov[1].iov_base = (char *)(req->Buffer);
2124         iov[1].iov_len = len;
2125 
2126         inc_rfc1001_len(req, len - 1 /* Buffer */);
2127 
2128         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2129         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2130 
2131         if (rc) {
2132                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2133                 goto qdir_exit;
2134         }
2135 
2136         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2137                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2138                           info_buf_size);
2139         if (rc)
2140                 goto qdir_exit;
2141 
2142         srch_inf->unicode = true;
2143 
2144         if (srch_inf->ntwrk_buf_start) {
2145                 if (srch_inf->smallBuf)
2146                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2147                 else
2148                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2149         }
2150         srch_inf->ntwrk_buf_start = (char *)rsp;
2151         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2152                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2153         /* 4 for rfc1002 length field */
2154         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2155         srch_inf->entries_in_buffer =
2156                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2157                                     &srch_inf->last_entry, info_buf_size);
2158         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2159         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2160                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2161                  srch_inf->srch_entries_start, srch_inf->last_entry);
2162         if (resp_buftype == CIFS_LARGE_BUFFER)
2163                 srch_inf->smallBuf = false;
2164         else if (resp_buftype == CIFS_SMALL_BUFFER)
2165                 srch_inf->smallBuf = true;
2166         else
2167                 cifs_dbg(VFS, "illegal search buffer type\n");
2168 
2169         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2170                 srch_inf->endOfSearch = 1;
2171         else
2172                 srch_inf->endOfSearch = 0;
2173 
2174         return rc;
2175 
2176 qdir_exit:
2177         free_rsp_buf(resp_buftype, rsp);
2178         return rc;
2179 }
2180 
2181 static int
2182 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2183                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2184                unsigned int num, void **data, unsigned int *size)
2185 {
2186         struct smb2_set_info_req *req;
2187         struct smb2_set_info_rsp *rsp = NULL;
2188         struct kvec *iov;
2189         int rc = 0;
2190         int resp_buftype;
2191         unsigned int i;
2192         struct TCP_Server_Info *server;
2193         struct cifs_ses *ses = tcon->ses;
2194 
2195         if (ses && (ses->server))
2196                 server = ses->server;
2197         else
2198                 return -EIO;
2199 
2200         if (!num)
2201                 return -EINVAL;
2202 
2203         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2204         if (!iov)
2205                 return -ENOMEM;
2206 
2207         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2208         if (rc) {
2209                 kfree(iov);
2210                 return rc;
2211         }
2212 
2213         req->hdr.ProcessId = cpu_to_le32(pid);
2214 
2215         req->InfoType = SMB2_O_INFO_FILE;
2216         req->FileInfoClass = info_class;
2217         req->PersistentFileId = persistent_fid;
2218         req->VolatileFileId = volatile_fid;
2219 
2220         /* 4 for RFC1001 length and 1 for Buffer */
2221         req->BufferOffset =
2222                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2223         req->BufferLength = cpu_to_le32(*size);
2224 
2225         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2226 
2227         memcpy(req->Buffer, *data, *size);
2228 
2229         iov[0].iov_base = (char *)req;
2230         /* 4 for RFC1001 length */
2231         iov[0].iov_len = get_rfc1002_length(req) + 4;
2232 
2233         for (i = 1; i < num; i++) {
2234                 inc_rfc1001_len(req, size[i]);
2235                 le32_add_cpu(&req->BufferLength, size[i]);
2236                 iov[i].iov_base = (char *)data[i];
2237                 iov[i].iov_len = size[i];
2238         }
2239 
2240         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2241         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2242 
2243         if (rc != 0)
2244                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2245 
2246         free_rsp_buf(resp_buftype, rsp);
2247         kfree(iov);
2248         return rc;
2249 }
2250 
2251 int
2252 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2253             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2254 {
2255         struct smb2_file_rename_info info;
2256         void **data;
2257         unsigned int size[2];
2258         int rc;
2259         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2260 
2261         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2262         if (!data)
2263                 return -ENOMEM;
2264 
2265         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2266                               /* 0 = fail if target already exists */
2267         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2268         info.FileNameLength = cpu_to_le32(len);
2269 
2270         data[0] = &info;
2271         size[0] = sizeof(struct smb2_file_rename_info);
2272 
2273         data[1] = target_file;
2274         size[1] = len + 2 /* null */;
2275 
2276         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2277                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2278                            size);
2279         kfree(data);
2280         return rc;
2281 }
2282 
2283 int
2284 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2285                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2286 {
2287         struct smb2_file_link_info info;
2288         void **data;
2289         unsigned int size[2];
2290         int rc;
2291         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2292 
2293         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2294         if (!data)
2295                 return -ENOMEM;
2296 
2297         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2298                               /* 0 = fail if link already exists */
2299         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2300         info.FileNameLength = cpu_to_le32(len);
2301 
2302         data[0] = &info;
2303         size[0] = sizeof(struct smb2_file_link_info);
2304 
2305         data[1] = target_file;
2306         size[1] = len + 2 /* null */;
2307 
2308         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2309                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2310         kfree(data);
2311         return rc;
2312 }
2313 
2314 int
2315 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2316              u64 volatile_fid, u32 pid, __le64 *eof)
2317 {
2318         struct smb2_file_eof_info info;
2319         void *data;
2320         unsigned int size;
2321 
2322         info.EndOfFile = *eof;
2323 
2324         data = &info;
2325         size = sizeof(struct smb2_file_eof_info);
2326 
2327         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2328                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2329 }
2330 
2331 int
2332 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2333               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2334 {
2335         unsigned int size;
2336         size = sizeof(FILE_BASIC_INFO);
2337         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2338                              current->tgid, FILE_BASIC_INFORMATION, 1,
2339                              (void **)&buf, &size);
2340 }
2341 
2342 int
2343 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2344                   const u64 persistent_fid, const u64 volatile_fid,
2345                   __u8 oplock_level)
2346 {
2347         int rc;
2348         struct smb2_oplock_break *req = NULL;
2349 
2350         cifs_dbg(FYI, "SMB2_oplock_break\n");
2351         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2352 
2353         if (rc)
2354                 return rc;
2355 
2356         req->VolatileFid = volatile_fid;
2357         req->PersistentFid = persistent_fid;
2358         req->OplockLevel = oplock_level;
2359         req->hdr.CreditRequest = cpu_to_le16(1);
2360 
2361         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2362         /* SMB2 buffer freed by function above */
2363 
2364         if (rc) {
2365                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2366                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2367         }
2368 
2369         return rc;
2370 }
2371 
2372 static void
2373 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2374                         struct kstatfs *kst)
2375 {
2376         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2377                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2378         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2379         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2380         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2381         return;
2382 }
2383 
2384 static int
2385 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2386                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2387 {
2388         int rc;
2389         struct smb2_query_info_req *req;
2390 
2391         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2392 
2393         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2394                 return -EIO;
2395 
2396         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2397         if (rc)
2398                 return rc;
2399 
2400         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2401         req->FileInfoClass = level;
2402         req->PersistentFileId = persistent_fid;
2403         req->VolatileFileId = volatile_fid;
2404         /* 4 for rfc1002 length field and 1 for pad */
2405         req->InputBufferOffset =
2406                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2407         req->OutputBufferLength = cpu_to_le32(
2408                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2409 
2410         iov->iov_base = (char *)req;
2411         /* 4 for rfc1002 length field */
2412         iov->iov_len = get_rfc1002_length(req) + 4;
2413         return 0;
2414 }
2415 
2416 int
2417 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2418               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2419 {
2420         struct smb2_query_info_rsp *rsp = NULL;
2421         struct kvec iov;
2422         int rc = 0;
2423         int resp_buftype;
2424         struct cifs_ses *ses = tcon->ses;
2425         struct smb2_fs_full_size_info *info = NULL;
2426 
2427         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2428                                 sizeof(struct smb2_fs_full_size_info),
2429                                 persistent_fid, volatile_fid);
2430         if (rc)
2431                 return rc;
2432 
2433         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2434         if (rc) {
2435                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2436                 goto qfsinf_exit;
2437         }
2438         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2439 
2440         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2441                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2442         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2443                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2444                           sizeof(struct smb2_fs_full_size_info));
2445         if (!rc)
2446                 copy_fs_info_to_kstatfs(info, fsdata);
2447 
2448 qfsinf_exit:
2449         free_rsp_buf(resp_buftype, iov.iov_base);
2450         return rc;
2451 }
2452 
2453 int
2454 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2455               u64 persistent_fid, u64 volatile_fid, int level)
2456 {
2457         struct smb2_query_info_rsp *rsp = NULL;
2458         struct kvec iov;
2459         int rc = 0;
2460         int resp_buftype, max_len, min_len;
2461         struct cifs_ses *ses = tcon->ses;
2462         unsigned int rsp_len, offset;
2463 
2464         if (level == FS_DEVICE_INFORMATION) {
2465                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2466                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2467         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2468                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2469                 min_len = MIN_FS_ATTR_INFO_SIZE;
2470         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2471                 max_len = sizeof(struct smb3_fs_ss_info);
2472                 min_len = sizeof(struct smb3_fs_ss_info);
2473         } else {
2474                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2475                 return -EINVAL;
2476         }
2477 
2478         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2479                                 persistent_fid, volatile_fid);
2480         if (rc)
2481                 return rc;
2482 
2483         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2484         if (rc) {
2485                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2486                 goto qfsattr_exit;
2487         }
2488         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2489 
2490         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2491         offset = le16_to_cpu(rsp->OutputBufferOffset);
2492         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2493         if (rc)
2494                 goto qfsattr_exit;
2495 
2496         if (level == FS_ATTRIBUTE_INFORMATION)
2497                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2498                         + (char *)&rsp->hdr, min_t(unsigned int,
2499                         rsp_len, max_len));
2500         else if (level == FS_DEVICE_INFORMATION)
2501                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2502                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2503         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2504                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2505                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2506                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2507                 tcon->perf_sector_size =
2508                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2509         }
2510 
2511 qfsattr_exit:
2512         free_rsp_buf(resp_buftype, iov.iov_base);
2513         return rc;
2514 }
2515 
2516 int
2517 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2518            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2519            const __u32 num_lock, struct smb2_lock_element *buf)
2520 {
2521         int rc = 0;
2522         struct smb2_lock_req *req = NULL;
2523         struct kvec iov[2];
2524         int resp_buf_type;
2525         unsigned int count;
2526 
2527         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2528 
2529         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2530         if (rc)
2531                 return rc;
2532 
2533         req->hdr.ProcessId = cpu_to_le32(pid);
2534         req->LockCount = cpu_to_le16(num_lock);
2535 
2536         req->PersistentFileId = persist_fid;
2537         req->VolatileFileId = volatile_fid;
2538 
2539         count = num_lock * sizeof(struct smb2_lock_element);
2540         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2541 
2542         iov[0].iov_base = (char *)req;
2543         /* 4 for rfc1002 length field and count for all locks */
2544         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2545         iov[1].iov_base = (char *)buf;
2546         iov[1].iov_len = count;
2547 
2548         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2549         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2550         if (rc) {
2551                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2552                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2553         }
2554 
2555         return rc;
2556 }
2557 
2558 int
2559 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2560           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2561           const __u64 length, const __u64 offset, const __u32 lock_flags,
2562           const bool wait)
2563 {
2564         struct smb2_lock_element lock;
2565 
2566         lock.Offset = cpu_to_le64(offset);
2567         lock.Length = cpu_to_le64(length);
2568         lock.Flags = cpu_to_le32(lock_flags);
2569         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2570                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2571 
2572         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2573 }
2574 
2575 int
2576 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2577                  __u8 *lease_key, const __le32 lease_state)
2578 {
2579         int rc;
2580         struct smb2_lease_ack *req = NULL;
2581 
2582         cifs_dbg(FYI, "SMB2_lease_break\n");
2583         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2584 
2585         if (rc)
2586                 return rc;
2587 
2588         req->hdr.CreditRequest = cpu_to_le16(1);
2589         req->StructureSize = cpu_to_le16(36);
2590         inc_rfc1001_len(req, 12);
2591 
2592         memcpy(req->LeaseKey, lease_key, 16);
2593         req->LeaseState = lease_state;
2594 
2595         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2596         /* SMB2 buffer freed by function above */
2597 
2598         if (rc) {
2599                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2600                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2601         }
2602 
2603         return rc;
2604 }
2605 

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