4 * Copyright (C) International Business Machines Corp., 2009, 2013
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Pavel Shilovsky (pshilovsky@samba.org) 2012
9 * Contains the routines for constructing the SMB2 PDUs themselves
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.
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.
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
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 */
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/uuid.h>
37 #include <linux/pagemap.h>
38 #include <linux/xattr.h>
42 #include "cifsproto.h"
43 #include "smb2proto.h"
44 #include "cifs_unicode.h"
45 #include "cifs_debug.h"
47 #include "smb2status.h"
50 #include "cifs_spnego.h"
51 #include "smbdirect.h"
54 * The following table defines the expected "StructureSize" of SMB2 requests
55 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
57 * Note that commands are defined in smb2pdu.h in le16 but the array below is
58 * indexed by command in host byte order.
60 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
61 /* SMB2_NEGOTIATE */ 36,
62 /* SMB2_SESSION_SETUP */ 25,
64 /* SMB2_TREE_CONNECT */ 9,
65 /* SMB2_TREE_DISCONNECT */ 4,
75 /* SMB2_QUERY_DIRECTORY */ 33,
76 /* SMB2_CHANGE_NOTIFY */ 32,
77 /* SMB2_QUERY_INFO */ 41,
78 /* SMB2_SET_INFO */ 33,
79 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
82 static int encryption_required(const struct cifs_tcon *tcon)
86 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
87 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
90 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
96 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
97 const struct cifs_tcon *tcon)
99 shdr->ProtocolId = SMB2_PROTO_NUMBER;
100 shdr->StructureSize = cpu_to_le16(64);
101 shdr->Command = smb2_cmd;
102 if (tcon && tcon->ses && tcon->ses->server) {
103 struct TCP_Server_Info *server = tcon->ses->server;
105 spin_lock(&server->req_lock);
106 /* Request up to 2 credits but don't go over the limit. */
107 if (server->credits >= server->max_credits)
108 shdr->CreditRequest = cpu_to_le16(0);
110 shdr->CreditRequest = cpu_to_le16(
111 min_t(int, server->max_credits -
112 server->credits, 2));
113 spin_unlock(&server->req_lock);
115 shdr->CreditRequest = cpu_to_le16(2);
117 shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
122 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
123 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
124 if ((tcon->ses) && (tcon->ses->server) &&
125 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
126 shdr->CreditCharge = cpu_to_le16(1);
127 /* else CreditCharge MBZ */
129 shdr->TreeId = tcon->tid;
130 /* Uid is not converted */
132 shdr->SessionId = tcon->ses->Suid;
135 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
136 * to pass the path on the Open SMB prefixed by \\server\share.
137 * Not sure when we would need to do the augmented path (if ever) and
138 * setting this flag breaks the SMB2 open operation since it is
139 * illegal to send an empty path name (without \\server\share prefix)
140 * when the DFS flag is set in the SMB open header. We could
141 * consider setting the flag on all operations other than open
142 * but it is safer to net set it for now.
144 /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
145 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
147 if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
148 !encryption_required(tcon))
149 shdr->Flags |= SMB2_FLAGS_SIGNED;
155 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
158 struct nls_table *nls_codepage;
159 struct cifs_ses *ses;
160 struct TCP_Server_Info *server;
163 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
164 * check for tcp and smb session status done differently
165 * for those three - in the calling routine.
170 if (smb2_command == SMB2_TREE_CONNECT)
173 if (tcon->tidStatus == CifsExiting) {
175 * only tree disconnect, open, and write,
176 * (and ulogoff which does not have tcon)
177 * are allowed as we start force umount.
179 if ((smb2_command != SMB2_WRITE) &&
180 (smb2_command != SMB2_CREATE) &&
181 (smb2_command != SMB2_TREE_DISCONNECT)) {
182 cifs_dbg(FYI, "can not send cmd %d while umounting\n",
187 if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
188 (!tcon->ses->server))
192 server = ses->server;
195 * Give demultiplex thread up to 10 seconds to reconnect, should be
196 * greater than cifs socket timeout which is 7 seconds
198 while (server->tcpStatus == CifsNeedReconnect) {
200 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
201 * here since they are implicitly done when session drops.
203 switch (smb2_command) {
205 * BB Should we keep oplock break and add flush to exceptions?
207 case SMB2_TREE_DISCONNECT:
210 case SMB2_OPLOCK_BREAK:
214 wait_event_interruptible_timeout(server->response_q,
215 (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
217 /* are we still trying to reconnect? */
218 if (server->tcpStatus != CifsNeedReconnect)
222 * on "soft" mounts we wait once. Hard mounts keep
223 * retrying until process is killed or server comes
227 cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
232 if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
235 nls_codepage = load_nls_default();
238 * need to prevent multiple threads trying to simultaneously reconnect
239 * the same SMB session
241 mutex_lock(&tcon->ses->session_mutex);
244 * Recheck after acquire mutex. If another thread is negotiating
245 * and the server never sends an answer the socket will be closed
246 * and tcpStatus set to reconnect.
248 if (server->tcpStatus == CifsNeedReconnect) {
250 mutex_unlock(&tcon->ses->session_mutex);
254 rc = cifs_negotiate_protocol(0, tcon->ses);
255 if (!rc && tcon->ses->need_reconnect)
256 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
258 if (rc || !tcon->need_reconnect) {
259 mutex_unlock(&tcon->ses->session_mutex);
263 cifs_mark_open_files_invalid(tcon);
264 if (tcon->use_persistent)
265 tcon->need_reopen_files = true;
267 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
268 mutex_unlock(&tcon->ses->session_mutex);
270 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
274 if (smb2_command != SMB2_INTERNAL_CMD)
275 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
277 atomic_inc(&tconInfoReconnectCount);
280 * Check if handle based operation so we know whether we can continue
281 * or not without returning to caller to reset file handle.
284 * BB Is flush done by server on drop of tcp session? Should we special
285 * case it and skip above?
287 switch (smb2_command) {
293 case SMB2_QUERY_DIRECTORY:
294 case SMB2_CHANGE_NOTIFY:
295 case SMB2_QUERY_INFO:
299 unload_nls(nls_codepage);
304 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
305 unsigned int *total_len)
307 struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
308 /* lookup word count ie StructureSize from table */
309 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
312 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
313 * largest operations (Create)
317 smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
318 spdu->StructureSize2 = cpu_to_le16(parmsize);
320 *total_len = parmsize + sizeof(struct smb2_sync_hdr);
324 * Allocate and return pointer to an SMB request hdr, and set basic
325 * SMB information in the SMB header. If the return code is zero, this
326 * function must have filled in request_buf pointer.
329 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
330 void **request_buf, unsigned int *total_len)
334 rc = smb2_reconnect(smb2_command, tcon);
338 /* BB eventually switch this to SMB2 specific small buf size */
339 *request_buf = cifs_small_buf_get();
340 if (*request_buf == NULL) {
341 /* BB should we add a retry in here if not a writepage? */
345 fill_small_buf(smb2_command, tcon,
346 (struct smb2_sync_hdr *)(*request_buf),
350 #ifdef CONFIG_CIFS_STATS2
351 uint16_t com_code = le16_to_cpu(smb2_command);
352 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
354 cifs_stats_inc(&tcon->num_smbs_sent);
360 #ifdef CONFIG_CIFS_SMB311
361 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
362 #define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) */
365 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
366 #define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
369 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
371 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
372 pneg_ctxt->DataLength = cpu_to_le16(38);
373 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
374 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
375 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
376 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
380 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
382 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
383 pneg_ctxt->DataLength = cpu_to_le16(6);
384 pneg_ctxt->CipherCount = cpu_to_le16(2);
385 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
386 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
390 assemble_neg_contexts(struct smb2_negotiate_req *req,
391 unsigned int *total_len)
393 char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
395 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
396 /* Add 2 to size to round to 8 byte boundary */
398 pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
399 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
400 req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
401 req->NegotiateContextCount = cpu_to_le16(2);
403 *total_len += 4 + sizeof(struct smb2_preauth_neg_context)
404 + sizeof(struct smb2_encryption_neg_context);
407 static void assemble_neg_contexts(struct smb2_negotiate_req *req,
408 unsigned int *total_len)
416 * SMB2 Worker functions follow:
418 * The general structure of the worker functions is:
419 * 1) Call smb2_init (assembles SMB2 header)
420 * 2) Initialize SMB2 command specific fields in fixed length area of SMB
421 * 3) Call smb_sendrcv2 (sends request on socket and waits for response)
422 * 4) Decode SMB2 command specific fields in the fixed length area
423 * 5) Decode variable length data area (if any for this SMB2 command type)
424 * 6) Call free smb buffer
430 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
432 struct smb2_negotiate_req *req;
433 struct smb2_negotiate_rsp *rsp;
438 struct TCP_Server_Info *server = ses->server;
439 int blob_offset, blob_length;
441 int flags = CIFS_NEG_OP;
442 unsigned int total_len;
444 cifs_dbg(FYI, "Negotiate protocol\n");
447 WARN(1, "%s: server is NULL!\n", __func__);
451 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
455 req->sync_hdr.SessionId = 0;
457 if (strcmp(ses->server->vals->version_string,
458 SMB3ANY_VERSION_STRING) == 0) {
459 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
460 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
461 req->DialectCount = cpu_to_le16(2);
463 } else if (strcmp(ses->server->vals->version_string,
464 SMBDEFAULT_VERSION_STRING) == 0) {
465 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
466 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
467 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
468 req->DialectCount = cpu_to_le16(3);
471 /* otherwise send specific dialect */
472 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
473 req->DialectCount = cpu_to_le16(1);
477 /* only one of SMB2 signing flags may be set in SMB2 request */
479 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
480 else if (global_secflags & CIFSSEC_MAY_SIGN)
481 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
483 req->SecurityMode = 0;
485 req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
487 /* ClientGUID must be zero for SMB2.02 dialect */
488 if (ses->server->vals->protocol_id == SMB20_PROT_ID)
489 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
491 memcpy(req->ClientGUID, server->client_guid,
492 SMB2_CLIENT_GUID_SIZE);
493 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
494 assemble_neg_contexts(req, &total_len);
496 iov[0].iov_base = (char *)req;
497 iov[0].iov_len = total_len;
499 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
500 cifs_small_buf_release(req);
501 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
503 * No tcon so can't do
504 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
506 if (rc == -EOPNOTSUPP) {
507 cifs_dbg(VFS, "Dialect not supported by server. Consider "
508 "specifying vers=1.0 or vers=2.0 on mount for accessing"
514 if (strcmp(ses->server->vals->version_string,
515 SMB3ANY_VERSION_STRING) == 0) {
516 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
518 "SMB2 dialect returned but not requested\n");
520 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
522 "SMB2.1 dialect returned but not requested\n");
525 } else if (strcmp(ses->server->vals->version_string,
526 SMBDEFAULT_VERSION_STRING) == 0) {
527 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
529 "SMB2 dialect returned but not requested\n");
531 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
532 /* ops set to 3.0 by default for default so update */
533 ses->server->ops = &smb21_operations;
535 } else if (le16_to_cpu(rsp->DialectRevision) !=
536 ses->server->vals->protocol_id) {
537 /* if requested single dialect ensure returned dialect matched */
538 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
539 le16_to_cpu(rsp->DialectRevision));
543 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
545 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
546 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
547 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
548 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
549 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
550 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
551 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
552 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
553 #ifdef CONFIG_CIFS_SMB311
554 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
555 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
558 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
559 le16_to_cpu(rsp->DialectRevision));
563 server->dialect = le16_to_cpu(rsp->DialectRevision);
565 /* BB: add check that dialect was valid given dialect(s) we asked for */
567 /* SMB2 only has an extended negflavor */
568 server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
569 /* set it to the maximum buffer size value we can send with 1 credit */
570 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
571 SMB2_MAX_BUFFER_SIZE);
572 server->max_read = le32_to_cpu(rsp->MaxReadSize);
573 server->max_write = le32_to_cpu(rsp->MaxWriteSize);
574 /* BB Do we need to validate the SecurityMode? */
575 server->sec_mode = le16_to_cpu(rsp->SecurityMode);
576 server->capabilities = le32_to_cpu(rsp->Capabilities);
578 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
580 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
583 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
585 * ses->sectype = RawNTLMSSP;
586 * but for time being this is our only auth choice so doesn't matter.
587 * We just found a server which sets blob length to zero expecting raw.
589 if (blob_length == 0) {
590 cifs_dbg(FYI, "missing security blob on negprot\n");
591 server->sec_ntlmssp = true;
594 rc = cifs_enable_signing(server, ses->sign);
598 rc = decode_negTokenInit(security_blob, blob_length, server);
605 free_rsp_buf(resp_buftype, rsp);
609 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
612 struct validate_negotiate_info_req vneg_inbuf;
613 struct validate_negotiate_info_rsp *pneg_rsp = NULL;
615 u32 inbuflen; /* max of 4 dialects */
617 cifs_dbg(FYI, "validate negotiate\n");
619 #ifdef CONFIG_CIFS_SMB_DIRECT
620 if (tcon->ses->server->rdma)
625 * validation ioctl must be signed, so no point sending this if we
626 * can not sign it (ie are not known user). Even if signing is not
627 * required (enabled but not negotiated), in those cases we selectively
628 * sign just this, the first and only signed request on a connection.
629 * Having validation of negotiate info helps reduce attack vectors.
631 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
632 return 0; /* validation requires signing */
634 if (tcon->ses->user_name == NULL) {
635 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
636 return 0; /* validation requires signing */
639 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
640 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
642 vneg_inbuf.Capabilities =
643 cpu_to_le32(tcon->ses->server->vals->req_capabilities);
644 memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
645 SMB2_CLIENT_GUID_SIZE);
648 vneg_inbuf.SecurityMode =
649 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
650 else if (global_secflags & CIFSSEC_MAY_SIGN)
651 vneg_inbuf.SecurityMode =
652 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
654 vneg_inbuf.SecurityMode = 0;
657 if (strcmp(tcon->ses->server->vals->version_string,
658 SMB3ANY_VERSION_STRING) == 0) {
659 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
660 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
661 vneg_inbuf.DialectCount = cpu_to_le16(2);
662 /* structure is big enough for 3 dialects, sending only 2 */
663 inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
664 } else if (strcmp(tcon->ses->server->vals->version_string,
665 SMBDEFAULT_VERSION_STRING) == 0) {
666 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
667 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
668 vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
669 vneg_inbuf.DialectCount = cpu_to_le16(3);
670 /* structure is big enough for 3 dialects */
671 inbuflen = sizeof(struct validate_negotiate_info_req);
673 /* otherwise specific dialect was requested */
674 vneg_inbuf.Dialects[0] =
675 cpu_to_le16(tcon->ses->server->vals->protocol_id);
676 vneg_inbuf.DialectCount = cpu_to_le16(1);
677 /* structure is big enough for 3 dialects, sending only 1 */
678 inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
681 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
682 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
683 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
684 (char **)&pneg_rsp, &rsplen);
687 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
691 if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
692 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
695 /* relax check since Mac returns max bufsize allowed on ioctl */
696 if ((rsplen > CIFSMaxBufSize)
697 || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
701 /* check validate negotiate info response matches what we got earlier */
702 if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
705 if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
708 /* do not validate server guid because not saved at negprot time yet */
710 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
711 SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
714 /* validate negotiate successful */
715 cifs_dbg(FYI, "validate negotiate info successful\n");
720 cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
727 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
736 if (server->sec_ntlmssp &&
737 (global_secflags & CIFSSEC_MAY_NTLMSSP))
739 if ((server->sec_kerberos || server->sec_mskerberos) &&
740 (global_secflags & CIFSSEC_MAY_KRB5))
748 struct SMB2_sess_data {
750 struct cifs_ses *ses;
751 struct nls_table *nls_cp;
752 void (*func)(struct SMB2_sess_data *);
754 u64 previous_session;
756 /* we will send the SMB in three pieces:
757 * a fixed length beginning part, an optional
758 * SPNEGO blob (which can be zero length), and a
759 * last part which will include the strings
760 * and rest of bcc area. This allows us to avoid
761 * a large buffer 17K allocation
768 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
771 struct cifs_ses *ses = sess_data->ses;
772 struct smb2_sess_setup_req *req;
773 struct TCP_Server_Info *server = ses->server;
774 unsigned int total_len;
776 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
781 /* First session, not a reauthenticate */
782 req->sync_hdr.SessionId = 0;
784 /* if reconnect, we need to send previous sess id, otherwise it is 0 */
785 req->PreviousSessionId = sess_data->previous_session;
787 req->Flags = 0; /* MBZ */
788 /* to enable echos and oplocks */
789 req->sync_hdr.CreditRequest = cpu_to_le16(3);
791 /* only one of SMB2 signing flags may be set in SMB2 request */
793 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
794 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
795 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
797 req->SecurityMode = 0;
799 req->Capabilities = 0;
800 req->Channel = 0; /* MBZ */
802 sess_data->iov[0].iov_base = (char *)req;
804 sess_data->iov[0].iov_len = total_len - 1;
806 * This variable will be used to clear the buffer
807 * allocated above in case of any error in the calling function.
809 sess_data->buf0_type = CIFS_SMALL_BUFFER;
815 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
817 free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
818 sess_data->buf0_type = CIFS_NO_BUFFER;
822 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
825 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
826 struct kvec rsp_iov = { NULL, 0 };
828 /* Testing shows that buffer offset must be at location of Buffer[0] */
829 req->SecurityBufferOffset =
830 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
831 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
833 /* BB add code to build os and lm fields */
835 rc = smb2_send_recv(sess_data->xid, sess_data->ses,
837 &sess_data->buf0_type,
838 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
839 cifs_small_buf_release(sess_data->iov[0].iov_base);
840 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
846 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
849 struct cifs_ses *ses = sess_data->ses;
851 mutex_lock(&ses->server->srv_mutex);
852 if (ses->server->ops->generate_signingkey) {
853 rc = ses->server->ops->generate_signingkey(ses);
856 "SMB3 session key generation failed\n");
857 mutex_unlock(&ses->server->srv_mutex);
861 if (!ses->server->session_estab) {
862 ses->server->sequence_number = 0x2;
863 ses->server->session_estab = true;
865 mutex_unlock(&ses->server->srv_mutex);
867 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
868 spin_lock(&GlobalMid_Lock);
869 ses->status = CifsGood;
870 ses->need_reconnect = false;
871 spin_unlock(&GlobalMid_Lock);
875 #ifdef CONFIG_CIFS_UPCALL
877 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
880 struct cifs_ses *ses = sess_data->ses;
881 struct cifs_spnego_msg *msg;
882 struct key *spnego_key = NULL;
883 struct smb2_sess_setup_rsp *rsp = NULL;
885 rc = SMB2_sess_alloc_buffer(sess_data);
889 spnego_key = cifs_get_spnego_key(ses);
890 if (IS_ERR(spnego_key)) {
891 rc = PTR_ERR(spnego_key);
896 msg = spnego_key->payload.data[0];
898 * check version field to make sure that cifs.upcall is
899 * sending us a response in an expected form
901 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
903 "bad cifs.upcall version. Expected %d got %d",
904 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
906 goto out_put_spnego_key;
909 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
911 if (!ses->auth_key.response) {
913 "Kerberos can't allocate (%u bytes) memory",
916 goto out_put_spnego_key;
918 ses->auth_key.len = msg->sesskey_len;
920 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
921 sess_data->iov[1].iov_len = msg->secblob_len;
923 rc = SMB2_sess_sendreceive(sess_data);
925 goto out_put_spnego_key;
927 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
928 ses->Suid = rsp->hdr.sync_hdr.SessionId;
930 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
932 rc = SMB2_sess_establish_session(sess_data);
934 key_invalidate(spnego_key);
937 sess_data->result = rc;
938 sess_data->func = NULL;
939 SMB2_sess_free_buffer(sess_data);
943 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
945 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
946 sess_data->result = -EOPNOTSUPP;
947 sess_data->func = NULL;
952 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
955 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
958 struct cifs_ses *ses = sess_data->ses;
959 struct smb2_sess_setup_rsp *rsp = NULL;
960 char *ntlmssp_blob = NULL;
961 bool use_spnego = false; /* else use raw ntlmssp */
965 * If memory allocation is successful, caller of this function
968 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
973 ses->ntlmssp->sesskey_per_smbsess = true;
975 rc = SMB2_sess_alloc_buffer(sess_data);
979 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
981 if (ntlmssp_blob == NULL) {
986 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
988 /* BB eventually need to add this */
989 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
993 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
994 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
996 sess_data->iov[1].iov_base = ntlmssp_blob;
997 sess_data->iov[1].iov_len = blob_length;
999 rc = SMB2_sess_sendreceive(sess_data);
1000 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1002 /* If true, rc here is expected and not an error */
1003 if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1004 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1010 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
1011 le16_to_cpu(rsp->SecurityBufferOffset)) {
1012 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1013 le16_to_cpu(rsp->SecurityBufferOffset));
1017 rc = decode_ntlmssp_challenge(rsp->Buffer,
1018 le16_to_cpu(rsp->SecurityBufferLength), ses);
1022 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1025 ses->Suid = rsp->hdr.sync_hdr.SessionId;
1026 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1029 kfree(ntlmssp_blob);
1030 SMB2_sess_free_buffer(sess_data);
1032 sess_data->result = 0;
1033 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1037 kfree(ses->ntlmssp);
1038 ses->ntlmssp = NULL;
1039 sess_data->result = rc;
1040 sess_data->func = NULL;
1044 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1047 struct cifs_ses *ses = sess_data->ses;
1048 struct smb2_sess_setup_req *req;
1049 struct smb2_sess_setup_rsp *rsp = NULL;
1050 unsigned char *ntlmssp_blob = NULL;
1051 bool use_spnego = false; /* else use raw ntlmssp */
1052 u16 blob_length = 0;
1054 rc = SMB2_sess_alloc_buffer(sess_data);
1058 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1059 req->sync_hdr.SessionId = ses->Suid;
1061 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1064 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1069 /* BB eventually need to add this */
1070 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1074 sess_data->iov[1].iov_base = ntlmssp_blob;
1075 sess_data->iov[1].iov_len = blob_length;
1077 rc = SMB2_sess_sendreceive(sess_data);
1081 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1083 ses->Suid = rsp->hdr.sync_hdr.SessionId;
1084 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1086 rc = SMB2_sess_establish_session(sess_data);
1088 kfree(ntlmssp_blob);
1089 SMB2_sess_free_buffer(sess_data);
1090 kfree(ses->ntlmssp);
1091 ses->ntlmssp = NULL;
1092 sess_data->result = rc;
1093 sess_data->func = NULL;
1097 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1101 type = smb2_select_sectype(ses->server, ses->sectype);
1102 cifs_dbg(FYI, "sess setup type %d\n", type);
1103 if (type == Unspecified) {
1105 "Unable to select appropriate authentication method!");
1111 sess_data->func = SMB2_auth_kerberos;
1114 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1117 cifs_dbg(VFS, "secType %d not supported!\n", type);
1125 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1126 const struct nls_table *nls_cp)
1129 struct TCP_Server_Info *server = ses->server;
1130 struct SMB2_sess_data *sess_data;
1132 cifs_dbg(FYI, "Session Setup\n");
1135 WARN(1, "%s: server is NULL!\n", __func__);
1139 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1143 rc = SMB2_select_sec(ses, sess_data);
1146 sess_data->xid = xid;
1147 sess_data->ses = ses;
1148 sess_data->buf0_type = CIFS_NO_BUFFER;
1149 sess_data->nls_cp = (struct nls_table *) nls_cp;
1151 while (sess_data->func)
1152 sess_data->func(sess_data);
1154 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1155 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1156 rc = sess_data->result;
1163 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1165 struct smb2_logoff_req *req; /* response is also trivial struct */
1167 struct TCP_Server_Info *server;
1169 unsigned int total_len;
1171 struct kvec rsp_iov;
1174 cifs_dbg(FYI, "disconnect session %p\n", ses);
1176 if (ses && (ses->server))
1177 server = ses->server;
1181 /* no need to send SMB logoff if uid already closed due to reconnect */
1182 if (ses->need_reconnect)
1183 goto smb2_session_already_dead;
1185 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1189 /* since no tcon, smb2_init can not do this, so do here */
1190 req->sync_hdr.SessionId = ses->Suid;
1192 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1193 flags |= CIFS_TRANSFORM_REQ;
1194 else if (server->sign)
1195 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1197 flags |= CIFS_NO_RESP;
1199 iov[0].iov_base = (char *)req;
1200 iov[0].iov_len = total_len;
1202 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1203 cifs_small_buf_release(req);
1205 * No tcon so can't do
1206 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1209 smb2_session_already_dead:
1213 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1215 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1218 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1220 /* These are similar values to what Windows uses */
1221 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1223 tcon->max_chunks = 256;
1224 tcon->max_bytes_chunk = 1048576;
1225 tcon->max_bytes_copy = 16777216;
1229 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1230 struct cifs_tcon *tcon, const struct nls_table *cp)
1232 struct smb2_tree_connect_req *req;
1233 struct smb2_tree_connect_rsp *rsp = NULL;
1235 struct kvec rsp_iov = { NULL, 0 };
1239 __le16 *unc_path = NULL;
1241 unsigned int total_len;
1243 cifs_dbg(FYI, "TCON\n");
1245 if (!(ses->server) || !tree)
1248 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1249 if (unc_path == NULL)
1252 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1254 if (unc_path_len < 2) {
1259 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1262 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1269 if (encryption_required(tcon))
1270 flags |= CIFS_TRANSFORM_REQ;
1272 iov[0].iov_base = (char *)req;
1274 iov[0].iov_len = total_len - 1;
1276 /* Testing shows that buffer offset must be at location of Buffer[0] */
1277 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1279 req->PathLength = cpu_to_le16(unc_path_len - 2);
1280 iov[1].iov_base = unc_path;
1281 iov[1].iov_len = unc_path_len;
1283 rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1284 cifs_small_buf_release(req);
1285 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1289 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1290 tcon->need_reconnect = true;
1292 goto tcon_error_exit;
1295 switch (rsp->ShareType) {
1296 case SMB2_SHARE_TYPE_DISK:
1297 cifs_dbg(FYI, "connection to disk share\n");
1299 case SMB2_SHARE_TYPE_PIPE:
1301 cifs_dbg(FYI, "connection to pipe share\n");
1303 case SMB2_SHARE_TYPE_PRINT:
1305 cifs_dbg(FYI, "connection to printer\n");
1308 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1310 goto tcon_error_exit;
1313 tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1314 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1315 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1316 tcon->tidStatus = CifsGood;
1317 tcon->need_reconnect = false;
1318 tcon->tid = rsp->hdr.sync_hdr.TreeId;
1319 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1321 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1322 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1323 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1326 !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1327 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1329 init_copy_chunk_defaults(tcon);
1330 if (tcon->ses->server->ops->validate_negotiate)
1331 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1333 free_rsp_buf(resp_buftype, rsp);
1338 if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1339 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1345 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1347 struct smb2_tree_disconnect_req *req; /* response is trivial */
1349 struct cifs_ses *ses = tcon->ses;
1351 unsigned int total_len;
1353 struct kvec rsp_iov;
1356 cifs_dbg(FYI, "Tree Disconnect\n");
1358 if (!ses || !(ses->server))
1361 if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1364 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1369 if (encryption_required(tcon))
1370 flags |= CIFS_TRANSFORM_REQ;
1372 flags |= CIFS_NO_RESP;
1374 iov[0].iov_base = (char *)req;
1375 iov[0].iov_len = total_len;
1377 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1378 cifs_small_buf_release(req);
1380 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1386 static struct create_durable *
1387 create_durable_buf(void)
1389 struct create_durable *buf;
1391 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1395 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1396 (struct create_durable, Data));
1397 buf->ccontext.DataLength = cpu_to_le32(16);
1398 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1399 (struct create_durable, Name));
1400 buf->ccontext.NameLength = cpu_to_le16(4);
1401 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1409 static struct create_durable *
1410 create_reconnect_durable_buf(struct cifs_fid *fid)
1412 struct create_durable *buf;
1414 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1418 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1419 (struct create_durable, Data));
1420 buf->ccontext.DataLength = cpu_to_le32(16);
1421 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1422 (struct create_durable, Name));
1423 buf->ccontext.NameLength = cpu_to_le16(4);
1424 buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1425 buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1426 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1435 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1436 unsigned int *epoch)
1439 struct create_context *cc;
1441 unsigned int remaining;
1444 data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1445 remaining = le32_to_cpu(rsp->CreateContextsLength);
1446 cc = (struct create_context *)data_offset;
1447 while (remaining >= sizeof(struct create_context)) {
1448 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1449 if (le16_to_cpu(cc->NameLength) == 4 &&
1450 strncmp(name, "RqLs", 4) == 0)
1451 return server->ops->parse_lease_buf(cc, epoch);
1453 next = le32_to_cpu(cc->Next);
1457 cc = (struct create_context *)((char *)cc + next);
1464 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1465 unsigned int *num_iovec, __u8 *oplock)
1467 struct smb2_create_req *req = iov[0].iov_base;
1468 unsigned int num = *num_iovec;
1470 iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1471 if (iov[num].iov_base == NULL)
1473 iov[num].iov_len = server->vals->create_lease_size;
1474 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1475 if (!req->CreateContextsOffset)
1476 req->CreateContextsOffset = cpu_to_le32(
1477 sizeof(struct smb2_create_req) +
1478 iov[num - 1].iov_len);
1479 le32_add_cpu(&req->CreateContextsLength,
1480 server->vals->create_lease_size);
1481 *num_iovec = num + 1;
1485 static struct create_durable_v2 *
1486 create_durable_v2_buf(struct cifs_fid *pfid)
1488 struct create_durable_v2 *buf;
1490 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1494 buf->ccontext.DataOffset = cpu_to_le16(offsetof
1495 (struct create_durable_v2, dcontext));
1496 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1497 buf->ccontext.NameOffset = cpu_to_le16(offsetof
1498 (struct create_durable_v2, Name));
1499 buf->ccontext.NameLength = cpu_to_le16(4);
1501 buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1502 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1503 generate_random_uuid(buf->dcontext.CreateGuid);
1504 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1506 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1514 static struct create_durable_handle_reconnect_v2 *
1515 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1517 struct create_durable_handle_reconnect_v2 *buf;
1519 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1524 buf->ccontext.DataOffset =
1525 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1527 buf->ccontext.DataLength =
1528 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1529 buf->ccontext.NameOffset =
1530 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1532 buf->ccontext.NameLength = cpu_to_le16(4);
1534 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1535 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1536 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1537 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1539 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1548 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1549 struct cifs_open_parms *oparms)
1551 struct smb2_create_req *req = iov[0].iov_base;
1552 unsigned int num = *num_iovec;
1554 iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1555 if (iov[num].iov_base == NULL)
1557 iov[num].iov_len = sizeof(struct create_durable_v2);
1558 if (!req->CreateContextsOffset)
1559 req->CreateContextsOffset =
1560 cpu_to_le32(sizeof(struct smb2_create_req) +
1562 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1563 *num_iovec = num + 1;
1568 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1569 struct cifs_open_parms *oparms)
1571 struct smb2_create_req *req = iov[0].iov_base;
1572 unsigned int num = *num_iovec;
1574 /* indicate that we don't need to relock the file */
1575 oparms->reconnect = false;
1577 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1578 if (iov[num].iov_base == NULL)
1580 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1581 if (!req->CreateContextsOffset)
1582 req->CreateContextsOffset =
1583 cpu_to_le32(sizeof(struct smb2_create_req) +
1585 le32_add_cpu(&req->CreateContextsLength,
1586 sizeof(struct create_durable_handle_reconnect_v2));
1587 *num_iovec = num + 1;
1592 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1593 struct cifs_open_parms *oparms, bool use_persistent)
1595 struct smb2_create_req *req = iov[0].iov_base;
1596 unsigned int num = *num_iovec;
1598 if (use_persistent) {
1599 if (oparms->reconnect)
1600 return add_durable_reconnect_v2_context(iov, num_iovec,
1603 return add_durable_v2_context(iov, num_iovec, oparms);
1606 if (oparms->reconnect) {
1607 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1608 /* indicate that we don't need to relock the file */
1609 oparms->reconnect = false;
1611 iov[num].iov_base = create_durable_buf();
1612 if (iov[num].iov_base == NULL)
1614 iov[num].iov_len = sizeof(struct create_durable);
1615 if (!req->CreateContextsOffset)
1616 req->CreateContextsOffset =
1617 cpu_to_le32(sizeof(struct smb2_create_req) +
1619 le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1620 *num_iovec = num + 1;
1625 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1626 const char *treename, const __le16 *path)
1628 int treename_len, path_len;
1629 struct nls_table *cp;
1630 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1635 treename_len = strlen(treename);
1636 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1642 path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1645 * make room for one path separator between the treename and
1648 *out_len = treename_len + 1 + path_len;
1651 * final path needs to be null-terminated UTF16 with a
1655 *out_size = roundup((*out_len+1)*2, 8);
1656 *out_path = kzalloc(*out_size, GFP_KERNEL);
1660 cp = load_nls_default();
1661 cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1662 UniStrcat(*out_path, sep);
1663 UniStrcat(*out_path, path);
1670 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1671 __u8 *oplock, struct smb2_file_all_info *buf,
1672 struct smb2_err_rsp **err_buf)
1674 struct smb2_create_req *req;
1675 struct smb2_create_rsp *rsp;
1676 struct TCP_Server_Info *server;
1677 struct cifs_tcon *tcon = oparms->tcon;
1678 struct cifs_ses *ses = tcon->ses;
1680 struct kvec rsp_iov = {NULL, 0};
1683 __le16 *copy_path = NULL;
1686 unsigned int n_iov = 2;
1687 __u32 file_attributes = 0;
1688 char *dhc_buf = NULL, *lc_buf = NULL;
1690 unsigned int total_len;
1692 cifs_dbg(FYI, "create/open\n");
1694 if (ses && (ses->server))
1695 server = ses->server;
1699 rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1704 if (encryption_required(tcon))
1705 flags |= CIFS_TRANSFORM_REQ;
1707 if (oparms->create_options & CREATE_OPTION_READONLY)
1708 file_attributes |= ATTR_READONLY;
1709 if (oparms->create_options & CREATE_OPTION_SPECIAL)
1710 file_attributes |= ATTR_SYSTEM;
1712 req->ImpersonationLevel = IL_IMPERSONATION;
1713 req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1714 /* File attributes ignored on open (used in create though) */
1715 req->FileAttributes = cpu_to_le32(file_attributes);
1716 req->ShareAccess = FILE_SHARE_ALL_LE;
1717 req->CreateDisposition = cpu_to_le32(oparms->disposition);
1718 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1720 iov[0].iov_base = (char *)req;
1721 /* -1 since last byte is buf[0] which is sent below (path) */
1722 iov[0].iov_len = total_len - 1;
1724 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1726 /* [MS-SMB2] 2.2.13 NameOffset:
1727 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1728 * the SMB2 header, the file name includes a prefix that will
1729 * be processed during DFS name normalization as specified in
1730 * section 3.3.5.9. Otherwise, the file name is relative to
1731 * the share that is identified by the TreeId in the SMB2
1734 if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1737 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1738 rc = alloc_path_with_tree_prefix(©_path, ©_size,
1740 tcon->treeName, path);
1743 req->NameLength = cpu_to_le16(name_len * 2);
1744 uni_path_len = copy_size;
1747 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1748 /* MUST set path len (NameLength) to 0 opening root of share */
1749 req->NameLength = cpu_to_le16(uni_path_len - 2);
1750 if (uni_path_len % 8 != 0) {
1751 copy_size = roundup(uni_path_len, 8);
1752 copy_path = kzalloc(copy_size, GFP_KERNEL);
1755 memcpy((char *)copy_path, (const char *)path,
1757 uni_path_len = copy_size;
1762 iov[1].iov_len = uni_path_len;
1763 iov[1].iov_base = path;
1765 if (!server->oplocks)
1766 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1768 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1769 *oplock == SMB2_OPLOCK_LEVEL_NONE)
1770 req->RequestedOplockLevel = *oplock;
1772 rc = add_lease_context(server, iov, &n_iov, oplock);
1774 cifs_small_buf_release(req);
1778 lc_buf = iov[n_iov-1].iov_base;
1781 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1782 /* need to set Next field of lease context if we request it */
1783 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1784 struct create_context *ccontext =
1785 (struct create_context *)iov[n_iov-1].iov_base;
1787 cpu_to_le32(server->vals->create_lease_size);
1790 rc = add_durable_context(iov, &n_iov, oparms,
1791 tcon->use_persistent);
1793 cifs_small_buf_release(req);
1798 dhc_buf = iov[n_iov-1].iov_base;
1801 rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
1803 cifs_small_buf_release(req);
1804 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1807 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1809 *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1814 oparms->fid->persistent_fid = rsp->PersistentFileId;
1815 oparms->fid->volatile_fid = rsp->VolatileFileId;
1818 memcpy(buf, &rsp->CreationTime, 32);
1819 buf->AllocationSize = rsp->AllocationSize;
1820 buf->EndOfFile = rsp->EndofFile;
1821 buf->Attributes = rsp->FileAttributes;
1822 buf->NumberOfLinks = cpu_to_le32(1);
1823 buf->DeletePending = 0;
1826 if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1827 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1829 *oplock = rsp->OplockLevel;
1834 free_rsp_buf(resp_buftype, rsp);
1839 * SMB2 IOCTL is used for both IOCTLs and FSCTLs
1842 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1843 u64 volatile_fid, u32 opcode, bool is_fsctl,
1844 char *in_data, u32 indatalen,
1845 char **out_data, u32 *plen /* returned data len */)
1847 struct smb2_ioctl_req *req;
1848 struct smb2_ioctl_rsp *rsp;
1849 struct smb2_sync_hdr *shdr;
1850 struct cifs_ses *ses;
1852 struct kvec rsp_iov;
1857 unsigned int total_len;
1859 cifs_dbg(FYI, "SMB2 IOCTL\n");
1861 if (out_data != NULL)
1864 /* zero out returned data len, in case of error */
1873 if (!ses || !(ses->server))
1876 rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
1880 if (encryption_required(tcon))
1881 flags |= CIFS_TRANSFORM_REQ;
1883 req->CtlCode = cpu_to_le32(opcode);
1884 req->PersistentFileId = persistent_fid;
1885 req->VolatileFileId = volatile_fid;
1888 req->InputCount = cpu_to_le32(indatalen);
1889 /* do not set InputOffset if no input data */
1891 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
1892 iov[1].iov_base = in_data;
1893 iov[1].iov_len = indatalen;
1898 req->OutputOffset = 0;
1899 req->OutputCount = 0; /* MBZ */
1902 * Could increase MaxOutputResponse, but that would require more
1903 * than one credit. Windows typically sets this smaller, but for some
1904 * ioctls it may be useful to allow server to send more. No point
1905 * limiting what the server can send as long as fits in one credit
1906 * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1907 * (by default, note that it can be overridden to make max larger)
1908 * in responses (except for read responses which can be bigger.
1909 * We may want to bump this limit up
1911 req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1914 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1918 iov[0].iov_base = (char *)req;
1921 * If no input data, the size of ioctl struct in
1922 * protocol spec still includes a 1 byte data buffer,
1923 * but if input data passed to ioctl, we do not
1924 * want to double count this, so we do not send
1925 * the dummy one byte of data in iovec[0] if sending
1926 * input data (in iovec[1]).
1930 iov[0].iov_len = total_len - 1;
1932 iov[0].iov_len = total_len;
1934 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
1935 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
1936 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1938 rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
1940 cifs_small_buf_release(req);
1941 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1943 if ((rc != 0) && (rc != -EINVAL)) {
1944 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1946 } else if (rc == -EINVAL) {
1947 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1948 (opcode != FSCTL_SRV_COPYCHUNK)) {
1949 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1954 /* check if caller wants to look at return data or just return rc */
1955 if ((plen == NULL) || (out_data == NULL))
1958 *plen = le32_to_cpu(rsp->OutputCount);
1960 /* We check for obvious errors in the output buffer length and offset */
1962 goto ioctl_exit; /* server returned no data */
1963 else if (*plen > 0xFF00) {
1964 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1970 if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1971 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1972 le32_to_cpu(rsp->OutputOffset));
1978 *out_data = kmalloc(*plen, GFP_KERNEL);
1979 if (*out_data == NULL) {
1984 shdr = get_sync_hdr(rsp);
1985 memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1987 free_rsp_buf(resp_buftype, rsp);
1992 * Individual callers to ioctl worker function follow
1996 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1997 u64 persistent_fid, u64 volatile_fid)
2000 struct compress_ioctl fsctl_input;
2001 char *ret_data = NULL;
2003 fsctl_input.CompressionState =
2004 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2006 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2007 FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2008 (char *)&fsctl_input /* data input */,
2009 2 /* in data len */, &ret_data /* out data */, NULL);
2011 cifs_dbg(FYI, "set compression rc %d\n", rc);
2017 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2018 u64 persistent_fid, u64 volatile_fid)
2020 struct smb2_close_req *req;
2021 struct smb2_close_rsp *rsp;
2022 struct cifs_ses *ses = tcon->ses;
2024 struct kvec rsp_iov;
2028 unsigned int total_len;
2030 cifs_dbg(FYI, "Close\n");
2032 if (!ses || !(ses->server))
2035 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2039 if (encryption_required(tcon))
2040 flags |= CIFS_TRANSFORM_REQ;
2042 req->PersistentFileId = persistent_fid;
2043 req->VolatileFileId = volatile_fid;
2045 iov[0].iov_base = (char *)req;
2046 iov[0].iov_len = total_len;
2048 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2049 cifs_small_buf_release(req);
2050 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2053 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2057 /* BB FIXME - decode close response, update inode for caching */
2060 free_rsp_buf(resp_buftype, rsp);
2065 validate_buf(unsigned int offset, unsigned int buffer_length,
2066 struct smb2_hdr *hdr, unsigned int min_buf_size)
2069 unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2070 char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2071 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2072 char *end_of_buf = begin_of_buf + buffer_length;
2075 if (buffer_length < min_buf_size) {
2076 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2077 buffer_length, min_buf_size);
2081 /* check if beyond RFC1001 maximum length */
2082 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2083 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2084 buffer_length, smb_len);
2088 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2089 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2097 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2098 * Caller must free buffer.
2101 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2102 struct smb2_hdr *hdr, unsigned int minbufsize,
2106 char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2112 rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2116 memcpy(data, begin_of_buf, buffer_length);
2122 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2123 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2124 u32 additional_info, size_t output_len, size_t min_len, void **data,
2127 struct smb2_query_info_req *req;
2128 struct smb2_query_info_rsp *rsp = NULL;
2130 struct kvec rsp_iov;
2133 struct cifs_ses *ses = tcon->ses;
2135 unsigned int total_len;
2137 cifs_dbg(FYI, "Query Info\n");
2139 if (!ses || !(ses->server))
2142 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2147 if (encryption_required(tcon))
2148 flags |= CIFS_TRANSFORM_REQ;
2150 req->InfoType = info_type;
2151 req->FileInfoClass = info_class;
2152 req->PersistentFileId = persistent_fid;
2153 req->VolatileFileId = volatile_fid;
2154 req->AdditionalInformation = cpu_to_le32(additional_info);
2157 * We do not use the input buffer (do not send extra byte)
2159 req->InputBufferOffset = 0;
2161 req->OutputBufferLength = cpu_to_le32(output_len);
2163 iov[0].iov_base = (char *)req;
2165 iov[0].iov_len = total_len - 1;
2167 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2168 cifs_small_buf_release(req);
2169 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2172 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2177 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2179 *data = kmalloc(*dlen, GFP_KERNEL);
2182 "Error %d allocating memory for acl\n",
2190 rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2191 le32_to_cpu(rsp->OutputBufferLength),
2192 &rsp->hdr, min_len, *data);
2195 free_rsp_buf(resp_buftype, rsp);
2199 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2200 u64 persistent_fid, u64 volatile_fid,
2201 int ea_buf_size, struct smb2_file_full_ea_info *data)
2203 return query_info(xid, tcon, persistent_fid, volatile_fid,
2204 FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2206 sizeof(struct smb2_file_full_ea_info),
2211 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2212 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2214 return query_info(xid, tcon, persistent_fid, volatile_fid,
2215 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2216 sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2217 sizeof(struct smb2_file_all_info), (void **)&data,
2222 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2223 u64 persistent_fid, u64 volatile_fid,
2224 void **data, u32 *plen)
2226 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2229 return query_info(xid, tcon, persistent_fid, volatile_fid,
2230 0, SMB2_O_INFO_SECURITY, additional_info,
2231 SMB2_MAX_BUFFER_SIZE,
2232 sizeof(struct smb2_file_all_info), data, plen);
2236 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2237 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2239 return query_info(xid, tcon, persistent_fid, volatile_fid,
2240 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2241 sizeof(struct smb2_file_internal_info),
2242 sizeof(struct smb2_file_internal_info),
2243 (void **)&uniqueid, NULL);
2247 * This is a no-op for now. We're not really interested in the reply, but
2248 * rather in the fact that the server sent one and that server->lstrp
2251 * FIXME: maybe we should consider checking that the reply matches request?
2254 smb2_echo_callback(struct mid_q_entry *mid)
2256 struct TCP_Server_Info *server = mid->callback_data;
2257 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2258 unsigned int credits_received = 1;
2260 if (mid->mid_state == MID_RESPONSE_RECEIVED)
2261 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2263 DeleteMidQEntry(mid);
2264 add_credits(server, credits_received, CIFS_ECHO_OP);
2267 void smb2_reconnect_server(struct work_struct *work)
2269 struct TCP_Server_Info *server = container_of(work,
2270 struct TCP_Server_Info, reconnect.work);
2271 struct cifs_ses *ses;
2272 struct cifs_tcon *tcon, *tcon2;
2273 struct list_head tmp_list;
2274 int tcon_exist = false;
2276 int resched = false;
2279 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2280 mutex_lock(&server->reconnect_mutex);
2282 INIT_LIST_HEAD(&tmp_list);
2283 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2285 spin_lock(&cifs_tcp_ses_lock);
2286 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2287 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2288 if (tcon->need_reconnect || tcon->need_reopen_files) {
2290 list_add_tail(&tcon->rlist, &tmp_list);
2294 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2295 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2300 * Get the reference to server struct to be sure that the last call of
2301 * cifs_put_tcon() in the loop below won't release the server pointer.
2304 server->srv_count++;
2306 spin_unlock(&cifs_tcp_ses_lock);
2308 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2309 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2311 cifs_reopen_persistent_handles(tcon);
2314 list_del_init(&tcon->rlist);
2315 cifs_put_tcon(tcon);
2318 cifs_dbg(FYI, "Reconnecting tcons finished\n");
2320 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2321 mutex_unlock(&server->reconnect_mutex);
2323 /* now we can safely release srv struct */
2325 cifs_put_tcp_session(server, 1);
2329 SMB2_echo(struct TCP_Server_Info *server)
2331 struct smb2_echo_req *req;
2334 struct smb_rqst rqst = { .rq_iov = iov,
2336 unsigned int total_len;
2337 __be32 rfc1002_marker;
2339 cifs_dbg(FYI, "In echo request\n");
2341 if (server->tcpStatus == CifsNeedNegotiate) {
2342 /* No need to send echo on newly established connections */
2343 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2347 rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2351 req->sync_hdr.CreditRequest = cpu_to_le16(1);
2354 rfc1002_marker = cpu_to_be32(total_len);
2355 iov[0].iov_base = &rfc1002_marker;
2356 iov[1].iov_len = total_len;
2357 iov[1].iov_base = (char *)req;
2359 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2360 server, CIFS_ECHO_OP);
2362 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2364 cifs_small_buf_release(req);
2369 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2372 struct smb2_flush_req *req;
2373 struct cifs_ses *ses = tcon->ses;
2375 struct kvec rsp_iov;
2379 unsigned int total_len;
2381 cifs_dbg(FYI, "Flush\n");
2383 if (!ses || !(ses->server))
2386 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2390 if (encryption_required(tcon))
2391 flags |= CIFS_TRANSFORM_REQ;
2393 req->PersistentFileId = persistent_fid;
2394 req->VolatileFileId = volatile_fid;
2396 iov[0].iov_base = (char *)req;
2397 iov[0].iov_len = total_len;
2399 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2400 cifs_small_buf_release(req);
2403 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2405 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2410 * To form a chain of read requests, any read requests after the first should
2411 * have the end_of_chain boolean set to true.
2414 smb2_new_read_req(void **buf, unsigned int *total_len,
2415 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2416 unsigned int remaining_bytes, int request_type)
2419 struct smb2_read_plain_req *req = NULL;
2420 struct smb2_sync_hdr *shdr;
2421 struct TCP_Server_Info *server;
2423 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2428 server = io_parms->tcon->ses->server;
2430 return -ECONNABORTED;
2432 shdr = &req->sync_hdr;
2433 shdr->ProcessId = cpu_to_le32(io_parms->pid);
2435 req->PersistentFileId = io_parms->persistent_fid;
2436 req->VolatileFileId = io_parms->volatile_fid;
2437 req->ReadChannelInfoOffset = 0; /* reserved */
2438 req->ReadChannelInfoLength = 0; /* reserved */
2439 req->Channel = 0; /* reserved */
2440 req->MinimumCount = 0;
2441 req->Length = cpu_to_le32(io_parms->length);
2442 req->Offset = cpu_to_le64(io_parms->offset);
2443 #ifdef CONFIG_CIFS_SMB_DIRECT
2445 * If we want to do a RDMA write, fill in and append
2446 * smbd_buffer_descriptor_v1 to the end of read request
2448 if (server->rdma && rdata &&
2449 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
2451 struct smbd_buffer_descriptor_v1 *v1;
2452 bool need_invalidate =
2453 io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
2455 rdata->mr = smbd_register_mr(
2456 server->smbd_conn, rdata->pages,
2457 rdata->nr_pages, rdata->tailsz,
2458 true, need_invalidate);
2462 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2463 if (need_invalidate)
2464 req->Channel = SMB2_CHANNEL_RDMA_V1;
2465 req->ReadChannelInfoOffset =
2466 cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2467 req->ReadChannelInfoLength =
2468 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2469 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2470 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
2471 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
2472 v1->length = cpu_to_le32(rdata->mr->mr->length);
2474 *total_len += sizeof(*v1) - 1;
2477 if (request_type & CHAINED_REQUEST) {
2478 if (!(request_type & END_OF_CHAIN)) {
2479 /* next 8-byte aligned request */
2480 *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2481 shdr->NextCommand = cpu_to_le32(*total_len);
2482 } else /* END_OF_CHAIN */
2483 shdr->NextCommand = 0;
2484 if (request_type & RELATED_REQUEST) {
2485 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2487 * Related requests use info from previous read request
2490 shdr->SessionId = 0xFFFFFFFF;
2491 shdr->TreeId = 0xFFFFFFFF;
2492 req->PersistentFileId = 0xFFFFFFFF;
2493 req->VolatileFileId = 0xFFFFFFFF;
2496 if (remaining_bytes > io_parms->length)
2497 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2499 req->RemainingBytes = 0;
2506 smb2_readv_callback(struct mid_q_entry *mid)
2508 struct cifs_readdata *rdata = mid->callback_data;
2509 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2510 struct TCP_Server_Info *server = tcon->ses->server;
2511 struct smb2_sync_hdr *shdr =
2512 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2513 unsigned int credits_received = 1;
2514 struct smb_rqst rqst = { .rq_iov = rdata->iov,
2516 .rq_pages = rdata->pages,
2517 .rq_npages = rdata->nr_pages,
2518 .rq_pagesz = rdata->pagesz,
2519 .rq_tailsz = rdata->tailsz };
2521 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2522 __func__, mid->mid, mid->mid_state, rdata->result,
2525 switch (mid->mid_state) {
2526 case MID_RESPONSE_RECEIVED:
2527 credits_received = le16_to_cpu(shdr->CreditRequest);
2528 /* result already set, check signature */
2529 if (server->sign && !mid->decrypted) {
2532 rc = smb2_verify_signature(&rqst, server);
2534 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2537 /* FIXME: should this be counted toward the initiating task? */
2538 task_io_account_read(rdata->got_bytes);
2539 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2541 case MID_REQUEST_SUBMITTED:
2542 case MID_RETRY_NEEDED:
2543 rdata->result = -EAGAIN;
2544 if (server->sign && rdata->got_bytes)
2545 /* reset bytes number since we can not check a sign */
2546 rdata->got_bytes = 0;
2547 /* FIXME: should this be counted toward the initiating task? */
2548 task_io_account_read(rdata->got_bytes);
2549 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2552 if (rdata->result != -ENODATA)
2553 rdata->result = -EIO;
2555 #ifdef CONFIG_CIFS_SMB_DIRECT
2557 * If this rdata has a memmory registered, the MR can be freed
2558 * MR needs to be freed as soon as I/O finishes to prevent deadlock
2559 * because they have limited number and are used for future I/Os
2562 smbd_deregister_mr(rdata->mr);
2567 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2569 queue_work(cifsiod_wq, &rdata->work);
2570 DeleteMidQEntry(mid);
2571 add_credits(server, credits_received, 0);
2574 /* smb2_async_readv - send an async read, and set up mid to handle result */
2576 smb2_async_readv(struct cifs_readdata *rdata)
2580 struct smb2_sync_hdr *shdr;
2581 struct cifs_io_parms io_parms;
2582 struct smb_rqst rqst = { .rq_iov = rdata->iov,
2584 struct TCP_Server_Info *server;
2585 unsigned int total_len;
2588 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2589 __func__, rdata->offset, rdata->bytes);
2591 io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2592 io_parms.offset = rdata->offset;
2593 io_parms.length = rdata->bytes;
2594 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2595 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2596 io_parms.pid = rdata->pid;
2598 server = io_parms.tcon->ses->server;
2600 rc = smb2_new_read_req(
2601 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
2603 if (rc == -EAGAIN && rdata->credits) {
2604 /* credits was reset by reconnect */
2606 /* reduce in_flight value since we won't send the req */
2607 spin_lock(&server->req_lock);
2608 server->in_flight--;
2609 spin_unlock(&server->req_lock);
2614 if (encryption_required(io_parms.tcon))
2615 flags |= CIFS_TRANSFORM_REQ;
2617 req_len = cpu_to_be32(total_len);
2619 rdata->iov[0].iov_base = &req_len;
2620 rdata->iov[0].iov_len = sizeof(__be32);
2621 rdata->iov[1].iov_base = buf;
2622 rdata->iov[1].iov_len = total_len;
2624 shdr = (struct smb2_sync_hdr *)buf;
2626 if (rdata->credits) {
2627 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2628 SMB2_MAX_BUFFER_SIZE));
2629 shdr->CreditRequest = shdr->CreditCharge;
2630 spin_lock(&server->req_lock);
2631 server->credits += rdata->credits -
2632 le16_to_cpu(shdr->CreditCharge);
2633 spin_unlock(&server->req_lock);
2634 wake_up(&server->request_q);
2635 flags |= CIFS_HAS_CREDITS;
2638 kref_get(&rdata->refcount);
2639 rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2640 cifs_readv_receive, smb2_readv_callback,
2641 smb3_handle_read_data, rdata, flags);
2643 kref_put(&rdata->refcount, cifs_readdata_release);
2644 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2647 cifs_small_buf_release(buf);
2652 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2653 unsigned int *nbytes, char **buf, int *buf_type)
2655 int resp_buftype, rc = -EACCES;
2656 struct smb2_read_plain_req *req = NULL;
2657 struct smb2_read_rsp *rsp = NULL;
2658 struct smb2_sync_hdr *shdr;
2660 struct kvec rsp_iov;
2661 unsigned int total_len;
2662 int flags = CIFS_LOG_ERROR;
2663 struct cifs_ses *ses = io_parms->tcon->ses;
2666 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
2670 if (encryption_required(io_parms->tcon))
2671 flags |= CIFS_TRANSFORM_REQ;
2673 iov[0].iov_base = (char *)req;
2674 iov[0].iov_len = total_len;
2676 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2677 cifs_small_buf_release(req);
2679 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2682 if (rc != -ENODATA) {
2683 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2684 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2686 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2687 return rc == -ENODATA ? 0 : rc;
2690 *nbytes = le32_to_cpu(rsp->DataLength);
2691 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2692 (*nbytes > io_parms->length)) {
2693 cifs_dbg(FYI, "bad length %d for count %d\n",
2694 *nbytes, io_parms->length);
2699 shdr = get_sync_hdr(rsp);
2702 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2703 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2704 } else if (resp_buftype != CIFS_NO_BUFFER) {
2705 *buf = rsp_iov.iov_base;
2706 if (resp_buftype == CIFS_SMALL_BUFFER)
2707 *buf_type = CIFS_SMALL_BUFFER;
2708 else if (resp_buftype == CIFS_LARGE_BUFFER)
2709 *buf_type = CIFS_LARGE_BUFFER;
2715 * Check the mid_state and signature on received buffer (if any), and queue the
2716 * workqueue completion task.
2719 smb2_writev_callback(struct mid_q_entry *mid)
2721 struct cifs_writedata *wdata = mid->callback_data;
2722 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2723 unsigned int written;
2724 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2725 unsigned int credits_received = 1;
2727 switch (mid->mid_state) {
2728 case MID_RESPONSE_RECEIVED:
2729 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2730 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2731 if (wdata->result != 0)
2734 written = le32_to_cpu(rsp->DataLength);
2736 * Mask off high 16 bits when bytes written as returned
2737 * by the server is greater than bytes requested by the
2738 * client. OS/2 servers are known to set incorrect
2741 if (written > wdata->bytes)
2744 if (written < wdata->bytes)
2745 wdata->result = -ENOSPC;
2747 wdata->bytes = written;
2749 case MID_REQUEST_SUBMITTED:
2750 case MID_RETRY_NEEDED:
2751 wdata->result = -EAGAIN;
2754 wdata->result = -EIO;
2757 #ifdef CONFIG_CIFS_SMB_DIRECT
2759 * If this wdata has a memory registered, the MR can be freed
2760 * The number of MRs available is limited, it's important to recover
2761 * used MR as soon as I/O is finished. Hold MR longer in the later
2762 * I/O process can possibly result in I/O deadlock due to lack of MR
2763 * to send request on I/O retry
2766 smbd_deregister_mr(wdata->mr);
2771 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2773 queue_work(cifsiod_wq, &wdata->work);
2774 DeleteMidQEntry(mid);
2775 add_credits(tcon->ses->server, credits_received, 0);
2778 /* smb2_async_writev - send an async write, and set up mid to handle result */
2780 smb2_async_writev(struct cifs_writedata *wdata,
2781 void (*release)(struct kref *kref))
2783 int rc = -EACCES, flags = 0;
2784 struct smb2_write_req *req = NULL;
2785 struct smb2_sync_hdr *shdr;
2786 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2787 struct TCP_Server_Info *server = tcon->ses->server;
2789 struct smb_rqst rqst = { };
2790 unsigned int total_len;
2791 __be32 rfc1002_marker;
2793 rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
2795 if (rc == -EAGAIN && wdata->credits) {
2796 /* credits was reset by reconnect */
2798 /* reduce in_flight value since we won't send the req */
2799 spin_lock(&server->req_lock);
2800 server->in_flight--;
2801 spin_unlock(&server->req_lock);
2803 goto async_writev_out;
2806 if (encryption_required(tcon))
2807 flags |= CIFS_TRANSFORM_REQ;
2809 shdr = (struct smb2_sync_hdr *)req;
2810 shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2812 req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2813 req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2814 req->WriteChannelInfoOffset = 0;
2815 req->WriteChannelInfoLength = 0;
2817 req->Offset = cpu_to_le64(wdata->offset);
2818 req->DataOffset = cpu_to_le16(
2819 offsetof(struct smb2_write_req, Buffer));
2820 req->RemainingBytes = 0;
2821 #ifdef CONFIG_CIFS_SMB_DIRECT
2823 * If we want to do a server RDMA read, fill in and append
2824 * smbd_buffer_descriptor_v1 to the end of write request
2826 if (server->rdma && wdata->bytes >=
2827 server->smbd_conn->rdma_readwrite_threshold) {
2829 struct smbd_buffer_descriptor_v1 *v1;
2830 bool need_invalidate = server->dialect == SMB30_PROT_ID;
2832 wdata->mr = smbd_register_mr(
2833 server->smbd_conn, wdata->pages,
2834 wdata->nr_pages, wdata->tailsz,
2835 false, need_invalidate);
2838 goto async_writev_out;
2841 req->DataOffset = 0;
2842 req->RemainingBytes =
2843 cpu_to_le32((wdata->nr_pages-1)*PAGE_SIZE + wdata->tailsz);
2844 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2845 if (need_invalidate)
2846 req->Channel = SMB2_CHANNEL_RDMA_V1;
2847 req->WriteChannelInfoOffset =
2848 cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
2849 req->WriteChannelInfoLength =
2850 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2851 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2852 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
2853 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
2854 v1->length = cpu_to_le32(wdata->mr->mr->length);
2857 /* 4 for rfc1002 length field and 1 for Buffer */
2859 rfc1002_marker = cpu_to_be32(total_len - 1 + wdata->bytes);
2860 iov[0].iov_base = &rfc1002_marker;
2861 iov[1].iov_len = total_len - 1;
2862 iov[1].iov_base = (char *)req;
2866 rqst.rq_pages = wdata->pages;
2867 rqst.rq_npages = wdata->nr_pages;
2868 rqst.rq_pagesz = wdata->pagesz;
2869 rqst.rq_tailsz = wdata->tailsz;
2870 #ifdef CONFIG_CIFS_SMB_DIRECT
2872 iov[1].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
2876 cifs_dbg(FYI, "async write at %llu %u bytes\n",
2877 wdata->offset, wdata->bytes);
2879 #ifdef CONFIG_CIFS_SMB_DIRECT
2880 /* For RDMA read, I/O size is in RemainingBytes not in Length */
2882 req->Length = cpu_to_le32(wdata->bytes);
2884 req->Length = cpu_to_le32(wdata->bytes);
2887 if (wdata->credits) {
2888 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2889 SMB2_MAX_BUFFER_SIZE));
2890 shdr->CreditRequest = shdr->CreditCharge;
2891 spin_lock(&server->req_lock);
2892 server->credits += wdata->credits -
2893 le16_to_cpu(shdr->CreditCharge);
2894 spin_unlock(&server->req_lock);
2895 wake_up(&server->request_q);
2896 flags |= CIFS_HAS_CREDITS;
2899 kref_get(&wdata->refcount);
2900 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2904 kref_put(&wdata->refcount, release);
2905 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2909 cifs_small_buf_release(req);
2914 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2915 * The length field from io_parms must be at least 1 and indicates a number of
2916 * elements with data to write that begins with position 1 in iov array. All
2917 * data length is specified by count.
2920 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2921 unsigned int *nbytes, struct kvec *iov, int n_vec)
2924 struct smb2_write_req *req = NULL;
2925 struct smb2_write_rsp *rsp = NULL;
2927 struct kvec rsp_iov;
2929 unsigned int total_len;
2936 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
2941 if (io_parms->tcon->ses->server == NULL)
2942 return -ECONNABORTED;
2944 if (encryption_required(io_parms->tcon))
2945 flags |= CIFS_TRANSFORM_REQ;
2947 req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2949 req->PersistentFileId = io_parms->persistent_fid;
2950 req->VolatileFileId = io_parms->volatile_fid;
2951 req->WriteChannelInfoOffset = 0;
2952 req->WriteChannelInfoLength = 0;
2954 req->Length = cpu_to_le32(io_parms->length);
2955 req->Offset = cpu_to_le64(io_parms->offset);
2956 req->DataOffset = cpu_to_le16(
2957 offsetof(struct smb2_write_req, Buffer));
2958 req->RemainingBytes = 0;
2960 iov[0].iov_base = (char *)req;
2962 iov[0].iov_len = total_len - 1;
2964 rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
2965 &resp_buftype, flags, &rsp_iov);
2966 cifs_small_buf_release(req);
2967 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2970 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2971 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2973 *nbytes = le32_to_cpu(rsp->DataLength);
2975 free_rsp_buf(resp_buftype, rsp);
2980 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2983 unsigned int entrycount = 0;
2984 unsigned int next_offset = 0;
2985 FILE_DIRECTORY_INFO *entryptr;
2987 if (bufstart == NULL)
2990 entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2993 entryptr = (FILE_DIRECTORY_INFO *)
2994 ((char *)entryptr + next_offset);
2996 if ((char *)entryptr + size > end_of_buf) {
2997 cifs_dbg(VFS, "malformed search entry would overflow\n");
3001 len = le32_to_cpu(entryptr->FileNameLength);
3002 if ((char *)entryptr + len + size > end_of_buf) {
3003 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3008 *lastentry = (char *)entryptr;
3011 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3023 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3024 u64 persistent_fid, u64 volatile_fid, int index,
3025 struct cifs_search_info *srch_inf)
3027 struct smb2_query_directory_req *req;
3028 struct smb2_query_directory_rsp *rsp = NULL;
3030 struct kvec rsp_iov;
3033 int resp_buftype = CIFS_NO_BUFFER;
3034 unsigned char *bufptr;
3035 struct TCP_Server_Info *server;
3036 struct cifs_ses *ses = tcon->ses;
3037 __le16 asteriks = cpu_to_le16('*');
3039 unsigned int output_size = CIFSMaxBufSize;
3040 size_t info_buf_size;
3042 unsigned int total_len;
3044 if (ses && (ses->server))
3045 server = ses->server;
3049 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3054 if (encryption_required(tcon))
3055 flags |= CIFS_TRANSFORM_REQ;
3057 switch (srch_inf->info_level) {
3058 case SMB_FIND_FILE_DIRECTORY_INFO:
3059 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3060 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3062 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3063 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3064 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3067 cifs_dbg(VFS, "info level %u isn't supported\n",
3068 srch_inf->info_level);
3073 req->FileIndex = cpu_to_le32(index);
3074 req->PersistentFileId = persistent_fid;
3075 req->VolatileFileId = volatile_fid;
3078 bufptr = req->Buffer;
3079 memcpy(bufptr, &asteriks, len);
3081 req->FileNameOffset =
3082 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3083 req->FileNameLength = cpu_to_le16(len);
3085 * BB could be 30 bytes or so longer if we used SMB2 specific
3086 * buffer lengths, but this is safe and close enough.
3088 output_size = min_t(unsigned int, output_size, server->maxBuf);
3089 output_size = min_t(unsigned int, output_size, 2 << 15);
3090 req->OutputBufferLength = cpu_to_le32(output_size);
3092 iov[0].iov_base = (char *)req;
3094 iov[0].iov_len = total_len - 1;
3096 iov[1].iov_base = (char *)(req->Buffer);
3097 iov[1].iov_len = len;
3099 rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3100 cifs_small_buf_release(req);
3101 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3104 if (rc == -ENODATA &&
3105 rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3106 srch_inf->endOfSearch = true;
3109 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3113 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3114 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3119 srch_inf->unicode = true;
3121 if (srch_inf->ntwrk_buf_start) {
3122 if (srch_inf->smallBuf)
3123 cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3125 cifs_buf_release(srch_inf->ntwrk_buf_start);
3127 srch_inf->ntwrk_buf_start = (char *)rsp;
3128 srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
3129 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
3130 /* 4 for rfc1002 length field */
3131 end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
3132 srch_inf->entries_in_buffer =
3133 num_entries(srch_inf->srch_entries_start, end_of_smb,
3134 &srch_inf->last_entry, info_buf_size);
3135 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3136 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3137 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3138 srch_inf->srch_entries_start, srch_inf->last_entry);
3139 if (resp_buftype == CIFS_LARGE_BUFFER)
3140 srch_inf->smallBuf = false;
3141 else if (resp_buftype == CIFS_SMALL_BUFFER)
3142 srch_inf->smallBuf = true;
3144 cifs_dbg(VFS, "illegal search buffer type\n");
3149 free_rsp_buf(resp_buftype, rsp);
3154 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3155 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3156 u8 info_type, u32 additional_info, unsigned int num,
3157 void **data, unsigned int *size)
3159 struct smb2_set_info_req *req;
3160 struct smb2_set_info_rsp *rsp = NULL;
3162 struct kvec rsp_iov;
3166 struct cifs_ses *ses = tcon->ses;
3168 unsigned int total_len;
3170 if (!ses || !(ses->server))
3176 iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3180 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3186 if (encryption_required(tcon))
3187 flags |= CIFS_TRANSFORM_REQ;
3189 req->sync_hdr.ProcessId = cpu_to_le32(pid);
3191 req->InfoType = info_type;
3192 req->FileInfoClass = info_class;
3193 req->PersistentFileId = persistent_fid;
3194 req->VolatileFileId = volatile_fid;
3195 req->AdditionalInformation = cpu_to_le32(additional_info);
3198 cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3199 req->BufferLength = cpu_to_le32(*size);
3201 memcpy(req->Buffer, *data, *size);
3204 iov[0].iov_base = (char *)req;
3206 iov[0].iov_len = total_len - 1;
3208 for (i = 1; i < num; i++) {
3209 le32_add_cpu(&req->BufferLength, size[i]);
3210 iov[i].iov_base = (char *)data[i];
3211 iov[i].iov_len = size[i];
3214 rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags,
3216 cifs_small_buf_release(req);
3217 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3220 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3222 free_rsp_buf(resp_buftype, rsp);
3228 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3229 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3231 struct smb2_file_rename_info info;
3233 unsigned int size[2];
3235 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3237 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3241 info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3242 /* 0 = fail if target already exists */
3243 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
3244 info.FileNameLength = cpu_to_le32(len);
3247 size[0] = sizeof(struct smb2_file_rename_info);
3249 data[1] = target_file;
3250 size[1] = len + 2 /* null */;
3252 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3253 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3260 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3261 u64 persistent_fid, u64 volatile_fid)
3263 __u8 delete_pending = 1;
3267 data = &delete_pending;
3268 size = 1; /* sizeof __u8 */
3270 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3271 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3272 0, 1, &data, &size);
3276 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3277 u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3279 struct smb2_file_link_info info;
3281 unsigned int size[2];
3283 int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3285 data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3289 info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3290 /* 0 = fail if link already exists */
3291 info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
3292 info.FileNameLength = cpu_to_le32(len);
3295 size[0] = sizeof(struct smb2_file_link_info);
3297 data[1] = target_file;
3298 size[1] = len + 2 /* null */;
3300 rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3301 current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3308 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3309 u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3311 struct smb2_file_eof_info info;
3315 info.EndOfFile = *eof;
3318 size = sizeof(struct smb2_file_eof_info);
3321 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3322 pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3323 0, 1, &data, &size);
3325 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3326 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3327 0, 1, &data, &size);
3331 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3332 u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3335 size = sizeof(FILE_BASIC_INFO);
3336 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3337 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3338 0, 1, (void **)&buf, &size);
3342 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3343 u64 persistent_fid, u64 volatile_fid,
3344 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3346 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3347 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3348 1, (void **)&pnntsd, &pacllen);
3352 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3353 u64 persistent_fid, u64 volatile_fid,
3354 struct smb2_file_full_ea_info *buf, int len)
3356 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3357 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3358 0, 1, (void **)&buf, &len);
3362 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3363 const u64 persistent_fid, const u64 volatile_fid,
3367 struct smb2_oplock_break_req *req = NULL;
3368 struct cifs_ses *ses = tcon->ses;
3369 int flags = CIFS_OBREAK_OP;
3370 unsigned int total_len;
3372 struct kvec rsp_iov;
3375 cifs_dbg(FYI, "SMB2_oplock_break\n");
3376 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3381 if (encryption_required(tcon))
3382 flags |= CIFS_TRANSFORM_REQ;
3384 req->VolatileFid = volatile_fid;
3385 req->PersistentFid = persistent_fid;
3386 req->OplockLevel = oplock_level;
3387 req->sync_hdr.CreditRequest = cpu_to_le16(1);
3389 flags |= CIFS_NO_RESP;
3391 iov[0].iov_base = (char *)req;
3392 iov[0].iov_len = total_len;
3394 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3395 cifs_small_buf_release(req);
3398 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3399 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3406 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3407 struct kstatfs *kst)
3409 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3410 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3411 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3412 kst->f_bfree = kst->f_bavail =
3413 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3418 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3419 int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3422 struct smb2_query_info_req *req;
3423 unsigned int total_len;
3425 cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3427 if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3430 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3435 req->InfoType = SMB2_O_INFO_FILESYSTEM;
3436 req->FileInfoClass = level;
3437 req->PersistentFileId = persistent_fid;
3438 req->VolatileFileId = volatile_fid;
3440 req->InputBufferOffset =
3441 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3442 req->OutputBufferLength = cpu_to_le32(
3443 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3445 iov->iov_base = (char *)req;
3446 iov->iov_len = total_len;
3451 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3452 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3454 struct smb2_query_info_rsp *rsp = NULL;
3456 struct kvec rsp_iov;
3459 struct cifs_ses *ses = tcon->ses;
3460 struct smb2_fs_full_size_info *info = NULL;
3463 rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3464 sizeof(struct smb2_fs_full_size_info),
3465 persistent_fid, volatile_fid);
3469 if (encryption_required(tcon))
3470 flags |= CIFS_TRANSFORM_REQ;
3472 rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3473 cifs_small_buf_release(iov.iov_base);
3475 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3478 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3480 info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3481 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3482 rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3483 le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3484 sizeof(struct smb2_fs_full_size_info));
3486 copy_fs_info_to_kstatfs(info, fsdata);
3489 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3494 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3495 u64 persistent_fid, u64 volatile_fid, int level)
3497 struct smb2_query_info_rsp *rsp = NULL;
3499 struct kvec rsp_iov;
3501 int resp_buftype, max_len, min_len;
3502 struct cifs_ses *ses = tcon->ses;
3503 unsigned int rsp_len, offset;
3506 if (level == FS_DEVICE_INFORMATION) {
3507 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3508 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3509 } else if (level == FS_ATTRIBUTE_INFORMATION) {
3510 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3511 min_len = MIN_FS_ATTR_INFO_SIZE;
3512 } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3513 max_len = sizeof(struct smb3_fs_ss_info);
3514 min_len = sizeof(struct smb3_fs_ss_info);
3516 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3520 rc = build_qfs_info_req(&iov, tcon, level, max_len,
3521 persistent_fid, volatile_fid);
3525 if (encryption_required(tcon))
3526 flags |= CIFS_TRANSFORM_REQ;
3528 rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3529 cifs_small_buf_release(iov.iov_base);
3531 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3534 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3536 rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3537 offset = le16_to_cpu(rsp->OutputBufferOffset);
3538 rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3542 if (level == FS_ATTRIBUTE_INFORMATION)
3543 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3544 + (char *)&rsp->hdr, min_t(unsigned int,
3546 else if (level == FS_DEVICE_INFORMATION)
3547 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3548 + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3549 else if (level == FS_SECTOR_SIZE_INFORMATION) {
3550 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3551 (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3552 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3553 tcon->perf_sector_size =
3554 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3558 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3563 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3564 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3565 const __u32 num_lock, struct smb2_lock_element *buf)
3568 struct smb2_lock_req *req = NULL;
3570 struct kvec rsp_iov;
3573 int flags = CIFS_NO_RESP;
3574 unsigned int total_len;
3576 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3578 rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3582 if (encryption_required(tcon))
3583 flags |= CIFS_TRANSFORM_REQ;
3585 req->sync_hdr.ProcessId = cpu_to_le32(pid);
3586 req->LockCount = cpu_to_le16(num_lock);
3588 req->PersistentFileId = persist_fid;
3589 req->VolatileFileId = volatile_fid;
3591 count = num_lock * sizeof(struct smb2_lock_element);
3593 iov[0].iov_base = (char *)req;
3594 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3595 iov[1].iov_base = (char *)buf;
3596 iov[1].iov_len = count;
3598 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3599 rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3601 cifs_small_buf_release(req);
3603 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3604 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3611 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3612 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3613 const __u64 length, const __u64 offset, const __u32 lock_flags,
3616 struct smb2_lock_element lock;
3618 lock.Offset = cpu_to_le64(offset);
3619 lock.Length = cpu_to_le64(length);
3620 lock.Flags = cpu_to_le32(lock_flags);
3621 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3622 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3624 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3628 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3629 __u8 *lease_key, const __le32 lease_state)
3632 struct smb2_lease_ack *req = NULL;
3633 struct cifs_ses *ses = tcon->ses;
3634 int flags = CIFS_OBREAK_OP;
3635 unsigned int total_len;
3637 struct kvec rsp_iov;
3640 cifs_dbg(FYI, "SMB2_lease_break\n");
3641 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3646 if (encryption_required(tcon))
3647 flags |= CIFS_TRANSFORM_REQ;
3649 req->sync_hdr.CreditRequest = cpu_to_le16(1);
3650 req->StructureSize = cpu_to_le16(36);
3653 memcpy(req->LeaseKey, lease_key, 16);
3654 req->LeaseState = lease_state;
3656 flags |= CIFS_NO_RESP;
3658 iov[0].iov_base = (char *)req;
3659 iov[0].iov_len = total_len;
3661 rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3662 cifs_small_buf_release(req);
3665 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3666 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);