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
smb2_crypto_shash_allocate(struct TCP_Server_Info * server)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
smb3_crypto_shash_allocate(struct TCP_Server_Info * server)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 *
smb2_find_smb_ses_unlocked(struct TCP_Server_Info * server,__u64 ses_id)118 smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
119 {
120 struct cifs_ses *ses;
121
122 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
123 if (ses->Suid != ses_id)
124 continue;
125 return ses;
126 }
127
128 return NULL;
129 }
130
131 struct cifs_ses *
smb2_find_smb_ses(struct TCP_Server_Info * server,__u64 ses_id)132 smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
133 {
134 struct cifs_ses *ses;
135
136 spin_lock(&cifs_tcp_ses_lock);
137 ses = smb2_find_smb_ses_unlocked(server, ses_id);
138 spin_unlock(&cifs_tcp_ses_lock);
139
140 return ses;
141 }
142
143 static struct cifs_tcon *
smb2_find_smb_sess_tcon_unlocked(struct cifs_ses * ses,__u32 tid)144 smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid)
145 {
146 struct cifs_tcon *tcon;
147
148 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
149 if (tcon->tid != tid)
150 continue;
151 ++tcon->tc_count;
152 return tcon;
153 }
154
155 return NULL;
156 }
157
158 /*
159 * Obtain tcon corresponding to the tid in the given
160 * cifs_ses
161 */
162
163 struct cifs_tcon *
smb2_find_smb_tcon(struct TCP_Server_Info * server,__u64 ses_id,__u32 tid)164 smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid)
165 {
166 struct cifs_ses *ses;
167 struct cifs_tcon *tcon;
168
169 spin_lock(&cifs_tcp_ses_lock);
170 ses = smb2_find_smb_ses_unlocked(server, ses_id);
171 if (!ses) {
172 spin_unlock(&cifs_tcp_ses_lock);
173 return NULL;
174 }
175 tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
176 spin_unlock(&cifs_tcp_ses_lock);
177
178 return tcon;
179 }
180
181 int
smb2_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)182 smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
183 {
184 int rc;
185 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
186 unsigned char *sigptr = smb2_signature;
187 struct kvec *iov = rqst->rq_iov;
188 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
189 struct cifs_ses *ses;
190
191 ses = smb2_find_smb_ses(server, smb2_pdu->SessionId);
192 if (!ses) {
193 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
194 return 0;
195 }
196
197 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
198 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
199
200 rc = smb2_crypto_shash_allocate(server);
201 if (rc) {
202 cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
203 return rc;
204 }
205
206 rc = crypto_shash_setkey(server->secmech.hmacsha256,
207 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
208 if (rc) {
209 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
210 return rc;
211 }
212
213 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
214 if (rc) {
215 cifs_dbg(VFS, "%s: Could not init sha256", __func__);
216 return rc;
217 }
218
219 rc = __cifs_calc_signature(rqst, server, sigptr,
220 &server->secmech.sdeschmacsha256->shash);
221
222 if (!rc)
223 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
224
225 return rc;
226 }
227
generate_key(struct cifs_ses * ses,struct kvec label,struct kvec context,__u8 * key,unsigned int key_size)228 static int generate_key(struct cifs_ses *ses, struct kvec label,
229 struct kvec context, __u8 *key, unsigned int key_size)
230 {
231 unsigned char zero = 0x0;
232 __u8 i[4] = {0, 0, 0, 1};
233 __u8 L[4] = {0, 0, 0, 128};
234 int rc = 0;
235 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
236 unsigned char *hashptr = prfhash;
237
238 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
239 memset(key, 0x0, key_size);
240
241 rc = smb3_crypto_shash_allocate(ses->server);
242 if (rc) {
243 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
244 goto smb3signkey_ret;
245 }
246
247 rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
248 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
249 if (rc) {
250 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
251 goto smb3signkey_ret;
252 }
253
254 rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
255 if (rc) {
256 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
257 goto smb3signkey_ret;
258 }
259
260 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
261 i, 4);
262 if (rc) {
263 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
264 goto smb3signkey_ret;
265 }
266
267 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
268 label.iov_base, label.iov_len);
269 if (rc) {
270 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
271 goto smb3signkey_ret;
272 }
273
274 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
275 &zero, 1);
276 if (rc) {
277 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
278 goto smb3signkey_ret;
279 }
280
281 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
282 context.iov_base, context.iov_len);
283 if (rc) {
284 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
285 goto smb3signkey_ret;
286 }
287
288 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
289 L, 4);
290 if (rc) {
291 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
292 goto smb3signkey_ret;
293 }
294
295 rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
296 hashptr);
297 if (rc) {
298 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
299 goto smb3signkey_ret;
300 }
301
302 memcpy(key, hashptr, key_size);
303
304 smb3signkey_ret:
305 return rc;
306 }
307
308 struct derivation {
309 struct kvec label;
310 struct kvec context;
311 };
312
313 struct derivation_triplet {
314 struct derivation signing;
315 struct derivation encryption;
316 struct derivation decryption;
317 };
318
319 static int
generate_smb3signingkey(struct cifs_ses * ses,const struct derivation_triplet * ptriplet)320 generate_smb3signingkey(struct cifs_ses *ses,
321 const struct derivation_triplet *ptriplet)
322 {
323 int rc;
324
325 rc = generate_key(ses, ptriplet->signing.label,
326 ptriplet->signing.context, ses->smb3signingkey,
327 SMB3_SIGN_KEY_SIZE);
328 if (rc)
329 return rc;
330
331 rc = generate_key(ses, ptriplet->encryption.label,
332 ptriplet->encryption.context, ses->smb3encryptionkey,
333 SMB3_SIGN_KEY_SIZE);
334 if (rc)
335 return rc;
336
337 return generate_key(ses, ptriplet->decryption.label,
338 ptriplet->decryption.context,
339 ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
340 }
341
342 int
generate_smb30signingkey(struct cifs_ses * ses)343 generate_smb30signingkey(struct cifs_ses *ses)
344
345 {
346 struct derivation_triplet triplet;
347 struct derivation *d;
348
349 d = &triplet.signing;
350 d->label.iov_base = "SMB2AESCMAC";
351 d->label.iov_len = 12;
352 d->context.iov_base = "SmbSign";
353 d->context.iov_len = 8;
354
355 d = &triplet.encryption;
356 d->label.iov_base = "SMB2AESCCM";
357 d->label.iov_len = 11;
358 d->context.iov_base = "ServerIn ";
359 d->context.iov_len = 10;
360
361 d = &triplet.decryption;
362 d->label.iov_base = "SMB2AESCCM";
363 d->label.iov_len = 11;
364 d->context.iov_base = "ServerOut";
365 d->context.iov_len = 10;
366
367 return generate_smb3signingkey(ses, &triplet);
368 }
369
370 int
generate_smb311signingkey(struct cifs_ses * ses)371 generate_smb311signingkey(struct cifs_ses *ses)
372
373 {
374 struct derivation_triplet triplet;
375 struct derivation *d;
376
377 d = &triplet.signing;
378 d->label.iov_base = "SMB2AESCMAC";
379 d->label.iov_len = 12;
380 d->context.iov_base = "SmbSign";
381 d->context.iov_len = 8;
382
383 d = &triplet.encryption;
384 d->label.iov_base = "SMB2AESCCM";
385 d->label.iov_len = 11;
386 d->context.iov_base = "ServerIn ";
387 d->context.iov_len = 10;
388
389 d = &triplet.decryption;
390 d->label.iov_base = "SMB2AESCCM";
391 d->label.iov_len = 11;
392 d->context.iov_base = "ServerOut";
393 d->context.iov_len = 10;
394
395 return generate_smb3signingkey(ses, &triplet);
396 }
397
398 int
smb3_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)399 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
400 {
401 int rc = 0;
402 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
403 unsigned char *sigptr = smb3_signature;
404 struct kvec *iov = rqst->rq_iov;
405 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
406 struct cifs_ses *ses;
407
408 ses = smb2_find_smb_ses(server, smb2_pdu->SessionId);
409 if (!ses) {
410 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
411 return 0;
412 }
413
414 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
415 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
416
417 rc = crypto_shash_setkey(server->secmech.cmacaes,
418 ses->smb3signingkey, SMB2_CMACAES_SIZE);
419
420 if (rc) {
421 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
422 return rc;
423 }
424
425 /*
426 * we already allocate sdesccmacaes when we init smb3 signing key,
427 * so unlike smb2 case we do not have to check here if secmech are
428 * initialized
429 */
430 rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
431 if (rc) {
432 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
433 return rc;
434 }
435
436 rc = __cifs_calc_signature(rqst, server, sigptr,
437 &server->secmech.sdesccmacaes->shash);
438
439 if (!rc)
440 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
441
442 return rc;
443 }
444
445 /* must be called with server->srv_mutex held */
446 static int
smb2_sign_rqst(struct smb_rqst * rqst,struct TCP_Server_Info * server)447 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
448 {
449 int rc = 0;
450 struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base;
451
452 if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) ||
453 server->tcpStatus == CifsNeedNegotiate)
454 return rc;
455
456 if (!server->session_estab) {
457 strncpy(smb2_pdu->Signature, "BSRSPYL", 8);
458 return rc;
459 }
460
461 rc = server->ops->calc_signature(rqst, server);
462
463 return rc;
464 }
465
466 int
smb2_verify_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)467 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
468 {
469 unsigned int rc;
470 char server_response_sig[16];
471 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
472
473 if ((smb2_pdu->Command == SMB2_NEGOTIATE) ||
474 (smb2_pdu->Command == SMB2_SESSION_SETUP) ||
475 (smb2_pdu->Command == SMB2_OPLOCK_BREAK) ||
476 (!server->session_estab))
477 return 0;
478
479 /*
480 * BB what if signatures are supposed to be on for session but
481 * server does not send one? BB
482 */
483
484 /* Do not need to verify session setups with signature "BSRSPYL " */
485 if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0)
486 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
487 smb2_pdu->Command);
488
489 /*
490 * Save off the origiginal signature so we can modify the smb and check
491 * our calculated signature against what the server sent.
492 */
493 memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE);
494
495 memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE);
496
497 mutex_lock(&server->srv_mutex);
498 rc = server->ops->calc_signature(rqst, server);
499 mutex_unlock(&server->srv_mutex);
500
501 if (rc)
502 return rc;
503
504 if (memcmp(server_response_sig, smb2_pdu->Signature,
505 SMB2_SIGNATURE_SIZE))
506 return -EACCES;
507 else
508 return 0;
509 }
510
511 /*
512 * Set message id for the request. Should be called after wait_for_free_request
513 * and when srv_mutex is held.
514 */
515 static inline void
smb2_seq_num_into_buf(struct TCP_Server_Info * server,struct smb2_hdr * hdr)516 smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr)
517 {
518 unsigned int i, num = le16_to_cpu(hdr->CreditCharge);
519
520 hdr->MessageId = get_next_mid64(server);
521 /* skip message numbers according to CreditCharge field */
522 for (i = 1; i < num; i++)
523 get_next_mid(server);
524 }
525
526 static struct mid_q_entry *
smb2_mid_entry_alloc(const struct smb2_hdr * smb_buffer,struct TCP_Server_Info * server)527 smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer,
528 struct TCP_Server_Info *server)
529 {
530 struct mid_q_entry *temp;
531
532 if (server == NULL) {
533 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
534 return NULL;
535 }
536
537 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
538 if (temp == NULL)
539 return temp;
540 else {
541 memset(temp, 0, sizeof(struct mid_q_entry));
542 temp->mid = le64_to_cpu(smb_buffer->MessageId);
543 temp->pid = current->pid;
544 temp->command = smb_buffer->Command; /* Always LE */
545 temp->when_alloc = jiffies;
546 temp->server = server;
547
548 /*
549 * The default is for the mid to be synchronous, so the
550 * default callback just wakes up the current task.
551 */
552 temp->callback = cifs_wake_up_task;
553 temp->callback_data = current;
554 }
555
556 atomic_inc(&midCount);
557 temp->mid_state = MID_REQUEST_ALLOCATED;
558 return temp;
559 }
560
561 static int
smb2_get_mid_entry(struct cifs_ses * ses,struct smb2_hdr * buf,struct mid_q_entry ** mid)562 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf,
563 struct mid_q_entry **mid)
564 {
565 if (ses->server->tcpStatus == CifsExiting)
566 return -ENOENT;
567
568 if (ses->server->tcpStatus == CifsNeedReconnect) {
569 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
570 return -EAGAIN;
571 }
572
573 if (ses->status == CifsNew) {
574 if ((buf->Command != SMB2_SESSION_SETUP) &&
575 (buf->Command != SMB2_NEGOTIATE))
576 return -EAGAIN;
577 /* else ok - we are setting up session */
578 }
579
580 if (ses->status == CifsExiting) {
581 if (buf->Command != SMB2_LOGOFF)
582 return -EAGAIN;
583 /* else ok - we are shutting down the session */
584 }
585
586 *mid = smb2_mid_entry_alloc(buf, ses->server);
587 if (*mid == NULL)
588 return -ENOMEM;
589 spin_lock(&GlobalMid_Lock);
590 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
591 spin_unlock(&GlobalMid_Lock);
592 return 0;
593 }
594
595 int
smb2_check_receive(struct mid_q_entry * mid,struct TCP_Server_Info * server,bool log_error)596 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
597 bool log_error)
598 {
599 unsigned int len = get_rfc1002_length(mid->resp_buf);
600 struct kvec iov;
601 struct smb_rqst rqst = { .rq_iov = &iov,
602 .rq_nvec = 1 };
603
604 iov.iov_base = (char *)mid->resp_buf;
605 iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4;
606
607 dump_smb(mid->resp_buf, min_t(u32, 80, len));
608 /* convert the length into a more usable form */
609 if (len > 24 && server->sign) {
610 int rc;
611
612 rc = smb2_verify_signature(&rqst, server);
613 if (rc)
614 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
615 rc);
616 }
617
618 return map_smb2_to_linux_error(mid->resp_buf, log_error);
619 }
620
621 struct mid_q_entry *
smb2_setup_request(struct cifs_ses * ses,struct smb_rqst * rqst)622 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
623 {
624 int rc;
625 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
626 struct mid_q_entry *mid;
627
628 smb2_seq_num_into_buf(ses->server, hdr);
629
630 rc = smb2_get_mid_entry(ses, hdr, &mid);
631 if (rc)
632 return ERR_PTR(rc);
633 rc = smb2_sign_rqst(rqst, ses->server);
634 if (rc) {
635 cifs_delete_mid(mid);
636 return ERR_PTR(rc);
637 }
638 return mid;
639 }
640
641 struct mid_q_entry *
smb2_setup_async_request(struct TCP_Server_Info * server,struct smb_rqst * rqst)642 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
643 {
644 int rc;
645 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
646 struct mid_q_entry *mid;
647
648 smb2_seq_num_into_buf(server, hdr);
649
650 mid = smb2_mid_entry_alloc(hdr, server);
651 if (mid == NULL)
652 return ERR_PTR(-ENOMEM);
653
654 rc = smb2_sign_rqst(rqst, server);
655 if (rc) {
656 DeleteMidQEntry(mid);
657 return ERR_PTR(rc);
658 }
659
660 return mid;
661 }
662