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Prepare for encryption support (first part). Add decryption and encryption key genera...
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1 /*
2 * fs/cifs/smb2transport.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002, 2011
5 * Etersoft, 2012
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Jeremy Allison (jra@samba.org) 2006
8 * Pavel Shilovsky (pshilovsky@samba.org) 2012
9 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25 #include <linux/fs.h>
26 #include <linux/list.h>
27 #include <linux/wait.h>
28 #include <linux/net.h>
29 #include <linux/delay.h>
30 #include <linux/uaccess.h>
31 #include <asm/processor.h>
32 #include <linux/mempool.h>
33 #include <linux/highmem.h>
34 #include "smb2pdu.h"
35 #include "cifsglob.h"
36 #include "cifsproto.h"
37 #include "smb2proto.h"
38 #include "cifs_debug.h"
39 #include "smb2status.h"
40 #include "smb2glob.h"
41
42 static int
43 smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
44 {
45 int rc;
46 unsigned int size;
47
48 if (server->secmech.sdeschmacsha256 != NULL)
49 return 0; /* already allocated */
50
51 server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
52 if (IS_ERR(server->secmech.hmacsha256)) {
53 cifs_dbg(VFS, "could not allocate crypto hmacsha256\n");
54 rc = PTR_ERR(server->secmech.hmacsha256);
55 server->secmech.hmacsha256 = NULL;
56 return rc;
57 }
58
59 size = sizeof(struct shash_desc) +
60 crypto_shash_descsize(server->secmech.hmacsha256);
61 server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
62 if (!server->secmech.sdeschmacsha256) {
63 crypto_free_shash(server->secmech.hmacsha256);
64 server->secmech.hmacsha256 = NULL;
65 return -ENOMEM;
66 }
67 server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
68 server->secmech.sdeschmacsha256->shash.flags = 0x0;
69
70 return 0;
71 }
72
73 static int
74 smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
75 {
76 unsigned int size;
77 int rc;
78
79 if (server->secmech.sdesccmacaes != NULL)
80 return 0; /* already allocated */
81
82 rc = smb2_crypto_shash_allocate(server);
83 if (rc)
84 return rc;
85
86 server->secmech.cmacaes = crypto_alloc_shash("cmac(aes)", 0, 0);
87 if (IS_ERR(server->secmech.cmacaes)) {
88 cifs_dbg(VFS, "could not allocate crypto cmac-aes");
89 kfree(server->secmech.sdeschmacsha256);
90 server->secmech.sdeschmacsha256 = NULL;
91 crypto_free_shash(server->secmech.hmacsha256);
92 server->secmech.hmacsha256 = NULL;
93 rc = PTR_ERR(server->secmech.cmacaes);
94 server->secmech.cmacaes = NULL;
95 return rc;
96 }
97
98 size = sizeof(struct shash_desc) +
99 crypto_shash_descsize(server->secmech.cmacaes);
100 server->secmech.sdesccmacaes = kmalloc(size, GFP_KERNEL);
101 if (!server->secmech.sdesccmacaes) {
102 cifs_dbg(VFS, "%s: Can't alloc cmacaes\n", __func__);
103 kfree(server->secmech.sdeschmacsha256);
104 server->secmech.sdeschmacsha256 = NULL;
105 crypto_free_shash(server->secmech.hmacsha256);
106 crypto_free_shash(server->secmech.cmacaes);
107 server->secmech.hmacsha256 = NULL;
108 server->secmech.cmacaes = NULL;
109 return -ENOMEM;
110 }
111 server->secmech.sdesccmacaes->shash.tfm = server->secmech.cmacaes;
112 server->secmech.sdesccmacaes->shash.flags = 0x0;
113
114 return 0;
115 }
116
117 static struct cifs_ses *
118 smb2_find_smb_ses(struct smb2_hdr *smb2hdr, struct TCP_Server_Info *server)
119 {
120 struct cifs_ses *ses;
121
122 spin_lock(&cifs_tcp_ses_lock);
123 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
124 if (ses->Suid != smb2hdr->SessionId)
125 continue;
126 spin_unlock(&cifs_tcp_ses_lock);
127 return ses;
128 }
129 spin_unlock(&cifs_tcp_ses_lock);
130
131 return NULL;
132 }
133
134
135 int
136 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
137 {
138 int i, rc;
139 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
140 unsigned char *sigptr = smb2_signature;
141 struct kvec *iov = rqst->rq_iov;
142 int n_vec = rqst->rq_nvec;
143 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
144 struct cifs_ses *ses;
145
146 ses = smb2_find_smb_ses(smb2_pdu, server);
147 if (!ses) {
148 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
149 return 0;
150 }
151
152 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
153 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
154
155 rc = smb2_crypto_shash_allocate(server);
156 if (rc) {
157 cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
158 return rc;
159 }
160
161 rc = crypto_shash_setkey(server->secmech.hmacsha256,
162 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
163 if (rc) {
164 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
165 return rc;
166 }
167
168 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
169 if (rc) {
170 cifs_dbg(VFS, "%s: Could not init sha256", __func__);
171 return rc;
172 }
173
174 for (i = 0; i < n_vec; i++) {
175 if (iov[i].iov_len == 0)
176 continue;
177 if (iov[i].iov_base == NULL) {
178 cifs_dbg(VFS, "null iovec entry\n");
179 return -EIO;
180 }
181 /*
182 * The first entry includes a length field (which does not get
183 * signed that occupies the first 4 bytes before the header).
184 */
185 if (i == 0) {
186 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
187 break; /* nothing to sign or corrupt header */
188 rc =
189 crypto_shash_update(
190 &server->secmech.sdeschmacsha256->shash,
191 iov[i].iov_base + 4, iov[i].iov_len - 4);
192 } else {
193 rc =
194 crypto_shash_update(
195 &server->secmech.sdeschmacsha256->shash,
196 iov[i].iov_base, iov[i].iov_len);
197 }
198 if (rc) {
199 cifs_dbg(VFS, "%s: Could not update with payload\n",
200 __func__);
201 return rc;
202 }
203 }
204
205 /* now hash over the rq_pages array */
206 for (i = 0; i < rqst->rq_npages; i++) {
207 struct kvec p_iov;
208
209 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
210 crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
211 p_iov.iov_base, p_iov.iov_len);
212 kunmap(rqst->rq_pages[i]);
213 }
214
215 rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
216 sigptr);
217 if (rc)
218 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
219
220 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
221
222 return rc;
223 }
224
225 static int generate_key(struct cifs_ses *ses, struct kvec label,
226 struct kvec context, __u8 *key, unsigned int key_size)
227 {
228 unsigned char zero = 0x0;
229 __u8 i[4] = {0, 0, 0, 1};
230 __u8 L[4] = {0, 0, 0, 128};
231 int rc = 0;
232 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
233 unsigned char *hashptr = prfhash;
234
235 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
236 memset(key, 0x0, key_size);
237
238 rc = smb3_crypto_shash_allocate(ses->server);
239 if (rc) {
240 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
241 goto smb3signkey_ret;
242 }
243
244 rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
245 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
246 if (rc) {
247 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
248 goto smb3signkey_ret;
249 }
250
251 rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
252 if (rc) {
253 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
254 goto smb3signkey_ret;
255 }
256
257 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
258 i, 4);
259 if (rc) {
260 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
261 goto smb3signkey_ret;
262 }
263
264 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
265 label.iov_base, label.iov_len);
266 if (rc) {
267 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
268 goto smb3signkey_ret;
269 }
270
271 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
272 &zero, 1);
273 if (rc) {
274 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
275 goto smb3signkey_ret;
276 }
277
278 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
279 context.iov_base, context.iov_len);
280 if (rc) {
281 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
282 goto smb3signkey_ret;
283 }
284
285 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
286 L, 4);
287 if (rc) {
288 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
289 goto smb3signkey_ret;
290 }
291
292 rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
293 hashptr);
294 if (rc) {
295 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
296 goto smb3signkey_ret;
297 }
298
299 memcpy(key, hashptr, key_size);
300
301 smb3signkey_ret:
302 return rc;
303 }
304
305 struct derivation {
306 struct kvec label;
307 struct kvec context;
308 };
309
310 struct derivation_triplet {
311 struct derivation signing;
312 struct derivation encryption;
313 struct derivation decryption;
314 };
315
316 static int
317 generate_smb3signingkey(struct cifs_ses *ses,
318 const struct derivation_triplet *ptriplet)
319 {
320 int rc;
321
322 rc = generate_key(ses, ptriplet->signing.label,
323 ptriplet->signing.context, ses->smb3signingkey,
324 SMB3_SIGN_KEY_SIZE);
325 if (rc)
326 return rc;
327
328 rc = generate_key(ses, ptriplet->encryption.label,
329 ptriplet->encryption.context, ses->smb3encryptionkey,
330 SMB3_SIGN_KEY_SIZE);
331 if (rc)
332 return rc;
333
334 return generate_key(ses, ptriplet->decryption.label,
335 ptriplet->decryption.context,
336 ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
337 }
338
339 int
340 generate_smb30signingkey(struct cifs_ses *ses)
341
342 {
343 struct derivation_triplet triplet;
344 struct derivation *d;
345
346 d = &triplet.signing;
347 d->label.iov_base = "SMB2AESCMAC";
348 d->label.iov_len = 12;
349 d->context.iov_base = "SmbSign";
350 d->context.iov_len = 8;
351
352 d = &triplet.encryption;
353 d->label.iov_base = "SMB2AESCCM";
354 d->label.iov_len = 11;
355 d->context.iov_base = "ServerIn ";
356 d->context.iov_len = 10;
357
358 d = &triplet.decryption;
359 d->label.iov_base = "SMB2AESCCM";
360 d->label.iov_len = 11;
361 d->context.iov_base = "ServerOut";
362 d->context.iov_len = 10;
363
364 return generate_smb3signingkey(ses, &triplet);
365 }
366
367 int
368 generate_smb311signingkey(struct cifs_ses *ses)
369
370 {
371 struct derivation_triplet triplet;
372 struct derivation *d;
373
374 d = &triplet.signing;
375 d->label.iov_base = "SMB2AESCMAC";
376 d->label.iov_len = 12;
377 d->context.iov_base = "SmbSign";
378 d->context.iov_len = 8;
379
380 d = &triplet.encryption;
381 d->label.iov_base = "SMB2AESCCM";
382 d->label.iov_len = 11;
383 d->context.iov_base = "ServerIn ";
384 d->context.iov_len = 10;
385
386 d = &triplet.decryption;
387 d->label.iov_base = "SMB2AESCCM";
388 d->label.iov_len = 11;
389 d->context.iov_base = "ServerOut";
390 d->context.iov_len = 10;
391
392 return generate_smb3signingkey(ses, &triplet);
393 }
394
395 int
396 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
397 {
398 int i;
399 int rc = 0;
400 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
401 unsigned char *sigptr = smb3_signature;
402 struct kvec *iov = rqst->rq_iov;
403 int n_vec = rqst->rq_nvec;
404 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
405 struct cifs_ses *ses;
406
407 ses = smb2_find_smb_ses(smb2_pdu, server);
408 if (!ses) {
409 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
410 return 0;
411 }
412
413 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
414 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
415
416 rc = crypto_shash_setkey(server->secmech.cmacaes,
417 ses->smb3signingkey, SMB2_CMACAES_SIZE);
418
419 if (rc) {
420 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
421 return rc;
422 }
423
424 /*
425 * we already allocate sdesccmacaes when we init smb3 signing key,
426 * so unlike smb2 case we do not have to check here if secmech are
427 * initialized
428 */
429 rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
430 if (rc) {
431 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
432 return rc;
433 }
434
435 for (i = 0; i < n_vec; i++) {
436 if (iov[i].iov_len == 0)
437 continue;
438 if (iov[i].iov_base == NULL) {
439 cifs_dbg(VFS, "null iovec entry");
440 return -EIO;
441 }
442 /*
443 * The first entry includes a length field (which does not get
444 * signed that occupies the first 4 bytes before the header).
445 */
446 if (i == 0) {
447 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
448 break; /* nothing to sign or corrupt header */
449 rc =
450 crypto_shash_update(
451 &server->secmech.sdesccmacaes->shash,
452 iov[i].iov_base + 4, iov[i].iov_len - 4);
453 } else {
454 rc =
455 crypto_shash_update(
456 &server->secmech.sdesccmacaes->shash,
457 iov[i].iov_base, iov[i].iov_len);
458 }
459 if (rc) {
460 cifs_dbg(VFS, "%s: Couldn't update cmac aes with payload\n",
461 __func__);
462 return rc;
463 }
464 }
465
466 /* now hash over the rq_pages array */
467 for (i = 0; i < rqst->rq_npages; i++) {
468 struct kvec p_iov;
469
470 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
471 crypto_shash_update(&server->secmech.sdesccmacaes->shash,
472 p_iov.iov_base, p_iov.iov_len);
473 kunmap(rqst->rq_pages[i]);
474 }
475
476 rc = crypto_shash_final(&server->secmech.sdesccmacaes->shash,
477 sigptr);
478 if (rc)
479 cifs_dbg(VFS, "%s: Could not generate cmac aes\n", __func__);
480
481 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
482
483 return rc;
484 }
485
486 /* must be called with server->srv_mutex held */
487 static int
488 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
489 {
490 int rc = 0;
491 struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base;
492
493 if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) ||
494 server->tcpStatus == CifsNeedNegotiate)
495 return rc;
496
497 if (!server->session_estab) {
498 strncpy(smb2_pdu->Signature, "BSRSPYL", 8);
499 return rc;
500 }
501
502 rc = server->ops->calc_signature(rqst, server);
503
504 return rc;
505 }
506
507 int
508 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
509 {
510 unsigned int rc;
511 char server_response_sig[16];
512 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
513
514 if ((smb2_pdu->Command == SMB2_NEGOTIATE) ||
515 (smb2_pdu->Command == SMB2_SESSION_SETUP) ||
516 (smb2_pdu->Command == SMB2_OPLOCK_BREAK) ||
517 (!server->session_estab))
518 return 0;
519
520 /*
521 * BB what if signatures are supposed to be on for session but
522 * server does not send one? BB
523 */
524
525 /* Do not need to verify session setups with signature "BSRSPYL " */
526 if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0)
527 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
528 smb2_pdu->Command);
529
530 /*
531 * Save off the origiginal signature so we can modify the smb and check
532 * our calculated signature against what the server sent.
533 */
534 memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE);
535
536 memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE);
537
538 mutex_lock(&server->srv_mutex);
539 rc = server->ops->calc_signature(rqst, server);
540 mutex_unlock(&server->srv_mutex);
541
542 if (rc)
543 return rc;
544
545 if (memcmp(server_response_sig, smb2_pdu->Signature,
546 SMB2_SIGNATURE_SIZE))
547 return -EACCES;
548 else
549 return 0;
550 }
551
552 /*
553 * Set message id for the request. Should be called after wait_for_free_request
554 * and when srv_mutex is held.
555 */
556 static inline void
557 smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr)
558 {
559 unsigned int i, num = le16_to_cpu(hdr->CreditCharge);
560
561 hdr->MessageId = get_next_mid64(server);
562 /* skip message numbers according to CreditCharge field */
563 for (i = 1; i < num; i++)
564 get_next_mid(server);
565 }
566
567 static struct mid_q_entry *
568 smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer,
569 struct TCP_Server_Info *server)
570 {
571 struct mid_q_entry *temp;
572
573 if (server == NULL) {
574 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
575 return NULL;
576 }
577
578 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
579 if (temp == NULL)
580 return temp;
581 else {
582 memset(temp, 0, sizeof(struct mid_q_entry));
583 temp->mid = le64_to_cpu(smb_buffer->MessageId);
584 temp->pid = current->pid;
585 temp->command = smb_buffer->Command; /* Always LE */
586 temp->when_alloc = jiffies;
587 temp->server = server;
588
589 /*
590 * The default is for the mid to be synchronous, so the
591 * default callback just wakes up the current task.
592 */
593 temp->callback = cifs_wake_up_task;
594 temp->callback_data = current;
595 }
596
597 atomic_inc(&midCount);
598 temp->mid_state = MID_REQUEST_ALLOCATED;
599 return temp;
600 }
601
602 static int
603 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf,
604 struct mid_q_entry **mid)
605 {
606 if (ses->server->tcpStatus == CifsExiting)
607 return -ENOENT;
608
609 if (ses->server->tcpStatus == CifsNeedReconnect) {
610 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
611 return -EAGAIN;
612 }
613
614 if (ses->status == CifsNew) {
615 if ((buf->Command != SMB2_SESSION_SETUP) &&
616 (buf->Command != SMB2_NEGOTIATE))
617 return -EAGAIN;
618 /* else ok - we are setting up session */
619 }
620
621 if (ses->status == CifsExiting) {
622 if (buf->Command != SMB2_LOGOFF)
623 return -EAGAIN;
624 /* else ok - we are shutting down the session */
625 }
626
627 *mid = smb2_mid_entry_alloc(buf, ses->server);
628 if (*mid == NULL)
629 return -ENOMEM;
630 spin_lock(&GlobalMid_Lock);
631 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
632 spin_unlock(&GlobalMid_Lock);
633 return 0;
634 }
635
636 int
637 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
638 bool log_error)
639 {
640 unsigned int len = get_rfc1002_length(mid->resp_buf);
641 struct kvec iov;
642 struct smb_rqst rqst = { .rq_iov = &iov,
643 .rq_nvec = 1 };
644
645 iov.iov_base = (char *)mid->resp_buf;
646 iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4;
647
648 dump_smb(mid->resp_buf, min_t(u32, 80, len));
649 /* convert the length into a more usable form */
650 if (len > 24 && server->sign) {
651 int rc;
652
653 rc = smb2_verify_signature(&rqst, server);
654 if (rc)
655 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
656 rc);
657 }
658
659 return map_smb2_to_linux_error(mid->resp_buf, log_error);
660 }
661
662 struct mid_q_entry *
663 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
664 {
665 int rc;
666 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
667 struct mid_q_entry *mid;
668
669 smb2_seq_num_into_buf(ses->server, hdr);
670
671 rc = smb2_get_mid_entry(ses, hdr, &mid);
672 if (rc)
673 return ERR_PTR(rc);
674 rc = smb2_sign_rqst(rqst, ses->server);
675 if (rc) {
676 cifs_delete_mid(mid);
677 return ERR_PTR(rc);
678 }
679 return mid;
680 }
681
682 struct mid_q_entry *
683 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
684 {
685 int rc;
686 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
687 struct mid_q_entry *mid;
688
689 smb2_seq_num_into_buf(server, hdr);
690
691 mid = smb2_mid_entry_alloc(hdr, server);
692 if (mid == NULL)
693 return ERR_PTR(-ENOMEM);
694
695 rc = smb2_sign_rqst(rqst, server);
696 if (rc) {
697 DeleteMidQEntry(mid);
698 return ERR_PTR(rc);
699 }
700
701 return mid;
702 }