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 i, rc;
185 unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
186 unsigned char *sigptr = smb2_signature;
187 struct kvec *iov = rqst->rq_iov;
188 int n_vec = rqst->rq_nvec;
189 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
190 struct cifs_ses *ses;
191
192 ses = smb2_find_smb_ses(server, smb2_pdu->SessionId);
193 if (!ses) {
194 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
195 return 0;
196 }
197
198 memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
199 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
200
201 rc = smb2_crypto_shash_allocate(server);
202 if (rc) {
203 cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
204 return rc;
205 }
206
207 rc = crypto_shash_setkey(server->secmech.hmacsha256,
208 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
209 if (rc) {
210 cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
211 return rc;
212 }
213
214 rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
215 if (rc) {
216 cifs_dbg(VFS, "%s: Could not init sha256", __func__);
217 return rc;
218 }
219
220 for (i = 0; i < n_vec; i++) {
221 if (iov[i].iov_len == 0)
222 continue;
223 if (iov[i].iov_base == NULL) {
224 cifs_dbg(VFS, "null iovec entry\n");
225 return -EIO;
226 }
227 /*
228 * The first entry includes a length field (which does not get
229 * signed that occupies the first 4 bytes before the header).
230 */
231 if (i == 0) {
232 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
233 break; /* nothing to sign or corrupt header */
234 rc =
235 crypto_shash_update(
236 &server->secmech.sdeschmacsha256->shash,
237 iov[i].iov_base + 4, iov[i].iov_len - 4);
238 } else {
239 rc =
240 crypto_shash_update(
241 &server->secmech.sdeschmacsha256->shash,
242 iov[i].iov_base, iov[i].iov_len);
243 }
244 if (rc) {
245 cifs_dbg(VFS, "%s: Could not update with payload\n",
246 __func__);
247 return rc;
248 }
249 }
250
251 /* now hash over the rq_pages array */
252 for (i = 0; i < rqst->rq_npages; i++) {
253 struct kvec p_iov;
254
255 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
256 crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
257 p_iov.iov_base, p_iov.iov_len);
258 kunmap(rqst->rq_pages[i]);
259 }
260
261 rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
262 sigptr);
263 if (rc)
264 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
265
266 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
267
268 return rc;
269 }
270
271 int
generate_smb3signingkey(struct cifs_ses * ses)272 generate_smb3signingkey(struct cifs_ses *ses)
273 {
274 unsigned char zero = 0x0;
275 __u8 i[4] = {0, 0, 0, 1};
276 __u8 L[4] = {0, 0, 0, 128};
277 int rc = 0;
278 unsigned char prfhash[SMB2_HMACSHA256_SIZE];
279 unsigned char *hashptr = prfhash;
280
281 memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
282 memset(ses->smb3signingkey, 0x0, SMB3_SIGNKEY_SIZE);
283
284 rc = smb3_crypto_shash_allocate(ses->server);
285 if (rc) {
286 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
287 goto smb3signkey_ret;
288 }
289
290 rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
291 ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
292 if (rc) {
293 cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
294 goto smb3signkey_ret;
295 }
296
297 rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
298 if (rc) {
299 cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
300 goto smb3signkey_ret;
301 }
302
303 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
304 i, 4);
305 if (rc) {
306 cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
307 goto smb3signkey_ret;
308 }
309
310 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
311 "SMB2AESCMAC", 12);
312 if (rc) {
313 cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
314 goto smb3signkey_ret;
315 }
316
317 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
318 &zero, 1);
319 if (rc) {
320 cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
321 goto smb3signkey_ret;
322 }
323
324 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
325 "SmbSign", 8);
326 if (rc) {
327 cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
328 goto smb3signkey_ret;
329 }
330
331 rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
332 L, 4);
333 if (rc) {
334 cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
335 goto smb3signkey_ret;
336 }
337
338 rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
339 hashptr);
340 if (rc) {
341 cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
342 goto smb3signkey_ret;
343 }
344
345 memcpy(ses->smb3signingkey, hashptr, SMB3_SIGNKEY_SIZE);
346
347 smb3signkey_ret:
348 return rc;
349 }
350
351 int
smb3_calc_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)352 smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
353 {
354 int i;
355 int rc = 0;
356 unsigned char smb3_signature[SMB2_CMACAES_SIZE];
357 unsigned char *sigptr = smb3_signature;
358 struct kvec *iov = rqst->rq_iov;
359 int n_vec = rqst->rq_nvec;
360 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
361 struct cifs_ses *ses;
362
363 ses = smb2_find_smb_ses(server, smb2_pdu->SessionId);
364 if (!ses) {
365 cifs_dbg(VFS, "%s: Could not find session\n", __func__);
366 return 0;
367 }
368
369 memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
370 memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
371
372 rc = crypto_shash_setkey(server->secmech.cmacaes,
373 ses->smb3signingkey, SMB2_CMACAES_SIZE);
374
375 if (rc) {
376 cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
377 return rc;
378 }
379
380 /*
381 * we already allocate sdesccmacaes when we init smb3 signing key,
382 * so unlike smb2 case we do not have to check here if secmech are
383 * initialized
384 */
385 rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
386 if (rc) {
387 cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
388 return rc;
389 }
390
391 for (i = 0; i < n_vec; i++) {
392 if (iov[i].iov_len == 0)
393 continue;
394 if (iov[i].iov_base == NULL) {
395 cifs_dbg(VFS, "null iovec entry");
396 return -EIO;
397 }
398 /*
399 * The first entry includes a length field (which does not get
400 * signed that occupies the first 4 bytes before the header).
401 */
402 if (i == 0) {
403 if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
404 break; /* nothing to sign or corrupt header */
405 rc =
406 crypto_shash_update(
407 &server->secmech.sdesccmacaes->shash,
408 iov[i].iov_base + 4, iov[i].iov_len - 4);
409 } else {
410 rc =
411 crypto_shash_update(
412 &server->secmech.sdesccmacaes->shash,
413 iov[i].iov_base, iov[i].iov_len);
414 }
415 if (rc) {
416 cifs_dbg(VFS, "%s: Couldn't update cmac aes with payload\n",
417 __func__);
418 return rc;
419 }
420 }
421
422 /* now hash over the rq_pages array */
423 for (i = 0; i < rqst->rq_npages; i++) {
424 struct kvec p_iov;
425
426 cifs_rqst_page_to_kvec(rqst, i, &p_iov);
427 crypto_shash_update(&server->secmech.sdesccmacaes->shash,
428 p_iov.iov_base, p_iov.iov_len);
429 kunmap(rqst->rq_pages[i]);
430 }
431
432 rc = crypto_shash_final(&server->secmech.sdesccmacaes->shash,
433 sigptr);
434 if (rc)
435 cifs_dbg(VFS, "%s: Could not generate cmac aes\n", __func__);
436
437 memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
438
439 return rc;
440 }
441
442 /* must be called with server->srv_mutex held */
443 static int
smb2_sign_rqst(struct smb_rqst * rqst,struct TCP_Server_Info * server)444 smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
445 {
446 int rc = 0;
447 struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base;
448
449 if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) ||
450 server->tcpStatus == CifsNeedNegotiate)
451 return rc;
452
453 if (!server->session_estab) {
454 strncpy(smb2_pdu->Signature, "BSRSPYL", 8);
455 return rc;
456 }
457
458 rc = server->ops->calc_signature(rqst, server);
459
460 return rc;
461 }
462
463 int
smb2_verify_signature(struct smb_rqst * rqst,struct TCP_Server_Info * server)464 smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
465 {
466 unsigned int rc;
467 char server_response_sig[16];
468 struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
469
470 if ((smb2_pdu->Command == SMB2_NEGOTIATE) ||
471 (smb2_pdu->Command == SMB2_SESSION_SETUP) ||
472 (smb2_pdu->Command == SMB2_OPLOCK_BREAK) ||
473 (!server->session_estab))
474 return 0;
475
476 /*
477 * BB what if signatures are supposed to be on for session but
478 * server does not send one? BB
479 */
480
481 /* Do not need to verify session setups with signature "BSRSPYL " */
482 if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0)
483 cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
484 smb2_pdu->Command);
485
486 /*
487 * Save off the origiginal signature so we can modify the smb and check
488 * our calculated signature against what the server sent.
489 */
490 memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE);
491
492 memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE);
493
494 mutex_lock(&server->srv_mutex);
495 rc = server->ops->calc_signature(rqst, server);
496 mutex_unlock(&server->srv_mutex);
497
498 if (rc)
499 return rc;
500
501 if (memcmp(server_response_sig, smb2_pdu->Signature,
502 SMB2_SIGNATURE_SIZE))
503 return -EACCES;
504 else
505 return 0;
506 }
507
508 /*
509 * Set message id for the request. Should be called after wait_for_free_request
510 * and when srv_mutex is held.
511 */
512 static inline void
smb2_seq_num_into_buf(struct TCP_Server_Info * server,struct smb2_hdr * hdr)513 smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr)
514 {
515 unsigned int i, num = le16_to_cpu(hdr->CreditCharge);
516
517 hdr->MessageId = get_next_mid64(server);
518 /* skip message numbers according to CreditCharge field */
519 for (i = 1; i < num; i++)
520 get_next_mid(server);
521 }
522
523 static struct mid_q_entry *
smb2_mid_entry_alloc(const struct smb2_hdr * smb_buffer,struct TCP_Server_Info * server)524 smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer,
525 struct TCP_Server_Info *server)
526 {
527 struct mid_q_entry *temp;
528
529 if (server == NULL) {
530 cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
531 return NULL;
532 }
533
534 temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
535 if (temp == NULL)
536 return temp;
537 else {
538 memset(temp, 0, sizeof(struct mid_q_entry));
539 temp->mid = le64_to_cpu(smb_buffer->MessageId);
540 temp->pid = current->pid;
541 temp->command = smb_buffer->Command; /* Always LE */
542 temp->when_alloc = jiffies;
543 temp->server = server;
544
545 /*
546 * The default is for the mid to be synchronous, so the
547 * default callback just wakes up the current task.
548 */
549 temp->callback = cifs_wake_up_task;
550 temp->callback_data = current;
551 }
552
553 atomic_inc(&midCount);
554 temp->mid_state = MID_REQUEST_ALLOCATED;
555 return temp;
556 }
557
558 static int
smb2_get_mid_entry(struct cifs_ses * ses,struct smb2_hdr * buf,struct mid_q_entry ** mid)559 smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf,
560 struct mid_q_entry **mid)
561 {
562 if (ses->server->tcpStatus == CifsExiting)
563 return -ENOENT;
564
565 if (ses->server->tcpStatus == CifsNeedReconnect) {
566 cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
567 return -EAGAIN;
568 }
569
570 if (ses->status == CifsNew) {
571 if ((buf->Command != SMB2_SESSION_SETUP) &&
572 (buf->Command != SMB2_NEGOTIATE))
573 return -EAGAIN;
574 /* else ok - we are setting up session */
575 }
576
577 if (ses->status == CifsExiting) {
578 if (buf->Command != SMB2_LOGOFF)
579 return -EAGAIN;
580 /* else ok - we are shutting down the session */
581 }
582
583 *mid = smb2_mid_entry_alloc(buf, ses->server);
584 if (*mid == NULL)
585 return -ENOMEM;
586 spin_lock(&GlobalMid_Lock);
587 list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
588 spin_unlock(&GlobalMid_Lock);
589 return 0;
590 }
591
592 int
smb2_check_receive(struct mid_q_entry * mid,struct TCP_Server_Info * server,bool log_error)593 smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
594 bool log_error)
595 {
596 unsigned int len = get_rfc1002_length(mid->resp_buf);
597 struct kvec iov;
598 struct smb_rqst rqst = { .rq_iov = &iov,
599 .rq_nvec = 1 };
600
601 iov.iov_base = (char *)mid->resp_buf;
602 iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4;
603
604 dump_smb(mid->resp_buf, min_t(u32, 80, len));
605 /* convert the length into a more usable form */
606 if (len > 24 && server->sign) {
607 int rc;
608
609 rc = smb2_verify_signature(&rqst, server);
610 if (rc)
611 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
612 rc);
613 }
614
615 return map_smb2_to_linux_error(mid->resp_buf, log_error);
616 }
617
618 struct mid_q_entry *
smb2_setup_request(struct cifs_ses * ses,struct smb_rqst * rqst)619 smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst)
620 {
621 int rc;
622 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
623 struct mid_q_entry *mid;
624
625 smb2_seq_num_into_buf(ses->server, hdr);
626
627 rc = smb2_get_mid_entry(ses, hdr, &mid);
628 if (rc)
629 return ERR_PTR(rc);
630 rc = smb2_sign_rqst(rqst, ses->server);
631 if (rc) {
632 cifs_delete_mid(mid);
633 return ERR_PTR(rc);
634 }
635 return mid;
636 }
637
638 struct mid_q_entry *
smb2_setup_async_request(struct TCP_Server_Info * server,struct smb_rqst * rqst)639 smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
640 {
641 int rc;
642 struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
643 struct mid_q_entry *mid;
644
645 smb2_seq_num_into_buf(server, hdr);
646
647 mid = smb2_mid_entry_alloc(hdr, server);
648 if (mid == NULL)
649 return ERR_PTR(-ENOMEM);
650
651 rc = smb2_sign_rqst(rqst, server);
652 if (rc) {
653 DeleteMidQEntry(mid);
654 return ERR_PTR(rc);
655 }
656
657 return mid;
658 }
659