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2dc7e1c0 PS |
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> | |
fb308a6f | 33 | #include <linux/highmem.h> |
2dc7e1c0 PS |
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" | |
3c1bf7e4 PS |
40 | #include "smb2glob.h" |
41 | ||
95dc8dd1 SF |
42 | static int |
43 | smb2_crypto_shash_allocate(struct TCP_Server_Info *server) | |
44 | { | |
ba482029 | 45 | int rc; |
95dc8dd1 SF |
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"); | |
ba482029 JL |
54 | rc = PTR_ERR(server->secmech.hmacsha256); |
55 | server->secmech.hmacsha256 = NULL; | |
56 | return rc; | |
95dc8dd1 SF |
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; | |
ba482029 JL |
93 | rc = PTR_ERR(server->secmech.cmacaes); |
94 | server->secmech.cmacaes = NULL; | |
95 | return rc; | |
95dc8dd1 SF |
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 | ||
32811d24 SP |
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 | ||
95dc8dd1 | 134 | |
38107d45 | 135 | int |
0b688cfc | 136 | smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 | 137 | { |
16c568ef | 138 | int rc; |
3c1bf7e4 PS |
139 | unsigned char smb2_signature[SMB2_HMACSHA256_SIZE]; |
140 | unsigned char *sigptr = smb2_signature; | |
0b688cfc | 141 | struct kvec *iov = rqst->rq_iov; |
3c1bf7e4 | 142 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base; |
32811d24 SP |
143 | struct cifs_ses *ses; |
144 | ||
145 | ses = smb2_find_smb_ses(smb2_pdu, server); | |
146 | if (!ses) { | |
147 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
148 | return 0; | |
149 | } | |
3c1bf7e4 PS |
150 | |
151 | memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); | |
152 | memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE); | |
153 | ||
95dc8dd1 SF |
154 | rc = smb2_crypto_shash_allocate(server); |
155 | if (rc) { | |
156 | cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__); | |
157 | return rc; | |
158 | } | |
159 | ||
3c1bf7e4 | 160 | rc = crypto_shash_setkey(server->secmech.hmacsha256, |
32811d24 | 161 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); |
3c1bf7e4 | 162 | if (rc) { |
f96637be | 163 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
3c1bf7e4 PS |
164 | return rc; |
165 | } | |
166 | ||
167 | rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); | |
168 | if (rc) { | |
95dc8dd1 | 169 | cifs_dbg(VFS, "%s: Could not init sha256", __func__); |
3c1bf7e4 PS |
170 | return rc; |
171 | } | |
172 | ||
16c568ef AV |
173 | rc = __cifs_calc_signature(rqst, server, sigptr, |
174 | &server->secmech.sdeschmacsha256->shash); | |
3c1bf7e4 | 175 | |
16c568ef AV |
176 | if (!rc) |
177 | memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE); | |
3c1bf7e4 PS |
178 | |
179 | return rc; | |
180 | } | |
181 | ||
373512ec SF |
182 | static int generate_key(struct cifs_ses *ses, struct kvec label, |
183 | struct kvec context, __u8 *key, unsigned int key_size) | |
429b46f4 SF |
184 | { |
185 | unsigned char zero = 0x0; | |
186 | __u8 i[4] = {0, 0, 0, 1}; | |
187 | __u8 L[4] = {0, 0, 0, 128}; | |
188 | int rc = 0; | |
189 | unsigned char prfhash[SMB2_HMACSHA256_SIZE]; | |
190 | unsigned char *hashptr = prfhash; | |
191 | ||
192 | memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE); | |
373512ec | 193 | memset(key, 0x0, key_size); |
429b46f4 | 194 | |
32811d24 | 195 | rc = smb3_crypto_shash_allocate(ses->server); |
95dc8dd1 SF |
196 | if (rc) { |
197 | cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); | |
198 | goto smb3signkey_ret; | |
199 | } | |
200 | ||
32811d24 SP |
201 | rc = crypto_shash_setkey(ses->server->secmech.hmacsha256, |
202 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); | |
429b46f4 SF |
203 | if (rc) { |
204 | cifs_dbg(VFS, "%s: Could not set with session key\n", __func__); | |
205 | goto smb3signkey_ret; | |
206 | } | |
207 | ||
32811d24 | 208 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash); |
429b46f4 SF |
209 | if (rc) { |
210 | cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__); | |
211 | goto smb3signkey_ret; | |
212 | } | |
213 | ||
32811d24 | 214 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
215 | i, 4); |
216 | if (rc) { | |
217 | cifs_dbg(VFS, "%s: Could not update with n\n", __func__); | |
218 | goto smb3signkey_ret; | |
219 | } | |
220 | ||
32811d24 | 221 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
373512ec | 222 | label.iov_base, label.iov_len); |
429b46f4 SF |
223 | if (rc) { |
224 | cifs_dbg(VFS, "%s: Could not update with label\n", __func__); | |
225 | goto smb3signkey_ret; | |
226 | } | |
227 | ||
32811d24 | 228 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
229 | &zero, 1); |
230 | if (rc) { | |
231 | cifs_dbg(VFS, "%s: Could not update with zero\n", __func__); | |
232 | goto smb3signkey_ret; | |
233 | } | |
234 | ||
32811d24 | 235 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
373512ec | 236 | context.iov_base, context.iov_len); |
429b46f4 SF |
237 | if (rc) { |
238 | cifs_dbg(VFS, "%s: Could not update with context\n", __func__); | |
239 | goto smb3signkey_ret; | |
240 | } | |
241 | ||
32811d24 | 242 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
243 | L, 4); |
244 | if (rc) { | |
245 | cifs_dbg(VFS, "%s: Could not update with L\n", __func__); | |
246 | goto smb3signkey_ret; | |
247 | } | |
248 | ||
32811d24 | 249 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
250 | hashptr); |
251 | if (rc) { | |
252 | cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); | |
253 | goto smb3signkey_ret; | |
254 | } | |
255 | ||
373512ec | 256 | memcpy(key, hashptr, key_size); |
429b46f4 SF |
257 | |
258 | smb3signkey_ret: | |
32811d24 | 259 | return rc; |
429b46f4 SF |
260 | } |
261 | ||
373512ec SF |
262 | struct derivation { |
263 | struct kvec label; | |
264 | struct kvec context; | |
265 | }; | |
266 | ||
267 | struct derivation_triplet { | |
268 | struct derivation signing; | |
269 | struct derivation encryption; | |
270 | struct derivation decryption; | |
271 | }; | |
272 | ||
273 | static int | |
274 | generate_smb3signingkey(struct cifs_ses *ses, | |
275 | const struct derivation_triplet *ptriplet) | |
276 | { | |
277 | int rc; | |
278 | ||
279 | rc = generate_key(ses, ptriplet->signing.label, | |
280 | ptriplet->signing.context, ses->smb3signingkey, | |
281 | SMB3_SIGN_KEY_SIZE); | |
282 | if (rc) | |
283 | return rc; | |
284 | ||
285 | rc = generate_key(ses, ptriplet->encryption.label, | |
286 | ptriplet->encryption.context, ses->smb3encryptionkey, | |
287 | SMB3_SIGN_KEY_SIZE); | |
288 | if (rc) | |
289 | return rc; | |
290 | ||
291 | return generate_key(ses, ptriplet->decryption.label, | |
292 | ptriplet->decryption.context, | |
293 | ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); | |
294 | } | |
295 | ||
296 | int | |
297 | generate_smb30signingkey(struct cifs_ses *ses) | |
298 | ||
299 | { | |
300 | struct derivation_triplet triplet; | |
301 | struct derivation *d; | |
302 | ||
303 | d = &triplet.signing; | |
304 | d->label.iov_base = "SMB2AESCMAC"; | |
305 | d->label.iov_len = 12; | |
306 | d->context.iov_base = "SmbSign"; | |
307 | d->context.iov_len = 8; | |
308 | ||
309 | d = &triplet.encryption; | |
310 | d->label.iov_base = "SMB2AESCCM"; | |
311 | d->label.iov_len = 11; | |
312 | d->context.iov_base = "ServerIn "; | |
313 | d->context.iov_len = 10; | |
314 | ||
315 | d = &triplet.decryption; | |
316 | d->label.iov_base = "SMB2AESCCM"; | |
317 | d->label.iov_len = 11; | |
318 | d->context.iov_base = "ServerOut"; | |
319 | d->context.iov_len = 10; | |
320 | ||
321 | return generate_smb3signingkey(ses, &triplet); | |
322 | } | |
323 | ||
324 | int | |
325 | generate_smb311signingkey(struct cifs_ses *ses) | |
326 | ||
327 | { | |
328 | struct derivation_triplet triplet; | |
329 | struct derivation *d; | |
330 | ||
331 | d = &triplet.signing; | |
332 | d->label.iov_base = "SMB2AESCMAC"; | |
333 | d->label.iov_len = 12; | |
334 | d->context.iov_base = "SmbSign"; | |
335 | d->context.iov_len = 8; | |
336 | ||
337 | d = &triplet.encryption; | |
338 | d->label.iov_base = "SMB2AESCCM"; | |
339 | d->label.iov_len = 11; | |
340 | d->context.iov_base = "ServerIn "; | |
341 | d->context.iov_len = 10; | |
342 | ||
343 | d = &triplet.decryption; | |
344 | d->label.iov_base = "SMB2AESCCM"; | |
345 | d->label.iov_len = 11; | |
346 | d->context.iov_base = "ServerOut"; | |
347 | d->context.iov_len = 10; | |
348 | ||
349 | return generate_smb3signingkey(ses, &triplet); | |
350 | } | |
351 | ||
38107d45 SF |
352 | int |
353 | smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) | |
354 | { | |
32811d24 | 355 | int rc = 0; |
429b46f4 SF |
356 | unsigned char smb3_signature[SMB2_CMACAES_SIZE]; |
357 | unsigned char *sigptr = smb3_signature; | |
358 | struct kvec *iov = rqst->rq_iov; | |
429b46f4 | 359 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base; |
32811d24 SP |
360 | struct cifs_ses *ses; |
361 | ||
362 | ses = smb2_find_smb_ses(smb2_pdu, server); | |
363 | if (!ses) { | |
364 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
365 | return 0; | |
366 | } | |
429b46f4 SF |
367 | |
368 | memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE); | |
369 | memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE); | |
370 | ||
371 | rc = crypto_shash_setkey(server->secmech.cmacaes, | |
32811d24 SP |
372 | ses->smb3signingkey, SMB2_CMACAES_SIZE); |
373 | ||
429b46f4 SF |
374 | if (rc) { |
375 | cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__); | |
376 | return rc; | |
377 | } | |
378 | ||
95dc8dd1 SF |
379 | /* |
380 | * we already allocate sdesccmacaes when we init smb3 signing key, | |
381 | * so unlike smb2 case we do not have to check here if secmech are | |
382 | * initialized | |
383 | */ | |
429b46f4 SF |
384 | rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash); |
385 | if (rc) { | |
386 | cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__); | |
387 | return rc; | |
388 | } | |
16c568ef AV |
389 | |
390 | rc = __cifs_calc_signature(rqst, server, sigptr, | |
391 | &server->secmech.sdesccmacaes->shash); | |
429b46f4 | 392 | |
16c568ef AV |
393 | if (!rc) |
394 | memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE); | |
429b46f4 SF |
395 | |
396 | return rc; | |
38107d45 SF |
397 | } |
398 | ||
3c1bf7e4 PS |
399 | /* must be called with server->srv_mutex held */ |
400 | static int | |
0b688cfc | 401 | smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
402 | { |
403 | int rc = 0; | |
0b688cfc | 404 | struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
405 | |
406 | if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) || | |
407 | server->tcpStatus == CifsNeedNegotiate) | |
408 | return rc; | |
409 | ||
410 | if (!server->session_estab) { | |
411 | strncpy(smb2_pdu->Signature, "BSRSPYL", 8); | |
412 | return rc; | |
413 | } | |
414 | ||
38107d45 | 415 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
416 | |
417 | return rc; | |
418 | } | |
419 | ||
420 | int | |
0b688cfc | 421 | smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
422 | { |
423 | unsigned int rc; | |
424 | char server_response_sig[16]; | |
0b688cfc | 425 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
426 | |
427 | if ((smb2_pdu->Command == SMB2_NEGOTIATE) || | |
32811d24 | 428 | (smb2_pdu->Command == SMB2_SESSION_SETUP) || |
3c1bf7e4 PS |
429 | (smb2_pdu->Command == SMB2_OPLOCK_BREAK) || |
430 | (!server->session_estab)) | |
431 | return 0; | |
432 | ||
433 | /* | |
434 | * BB what if signatures are supposed to be on for session but | |
435 | * server does not send one? BB | |
436 | */ | |
437 | ||
438 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
439 | if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0) | |
f96637be JP |
440 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
441 | smb2_pdu->Command); | |
3c1bf7e4 PS |
442 | |
443 | /* | |
444 | * Save off the origiginal signature so we can modify the smb and check | |
445 | * our calculated signature against what the server sent. | |
446 | */ | |
447 | memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE); | |
448 | ||
449 | memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE); | |
450 | ||
451 | mutex_lock(&server->srv_mutex); | |
38107d45 | 452 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
453 | mutex_unlock(&server->srv_mutex); |
454 | ||
455 | if (rc) | |
456 | return rc; | |
457 | ||
458 | if (memcmp(server_response_sig, smb2_pdu->Signature, | |
459 | SMB2_SIGNATURE_SIZE)) | |
460 | return -EACCES; | |
461 | else | |
462 | return 0; | |
463 | } | |
464 | ||
2dc7e1c0 PS |
465 | /* |
466 | * Set message id for the request. Should be called after wait_for_free_request | |
467 | * and when srv_mutex is held. | |
468 | */ | |
469 | static inline void | |
470 | smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr) | |
471 | { | |
cb7e9eab PS |
472 | unsigned int i, num = le16_to_cpu(hdr->CreditCharge); |
473 | ||
3d378d3f | 474 | hdr->MessageId = get_next_mid64(server); |
cb7e9eab PS |
475 | /* skip message numbers according to CreditCharge field */ |
476 | for (i = 1; i < num; i++) | |
477 | get_next_mid(server); | |
2dc7e1c0 PS |
478 | } |
479 | ||
480 | static struct mid_q_entry * | |
481 | smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer, | |
482 | struct TCP_Server_Info *server) | |
483 | { | |
484 | struct mid_q_entry *temp; | |
485 | ||
486 | if (server == NULL) { | |
f96637be | 487 | cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n"); |
2dc7e1c0 PS |
488 | return NULL; |
489 | } | |
490 | ||
491 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); | |
492 | if (temp == NULL) | |
493 | return temp; | |
494 | else { | |
495 | memset(temp, 0, sizeof(struct mid_q_entry)); | |
9235d098 | 496 | temp->mid = le64_to_cpu(smb_buffer->MessageId); |
2dc7e1c0 PS |
497 | temp->pid = current->pid; |
498 | temp->command = smb_buffer->Command; /* Always LE */ | |
499 | temp->when_alloc = jiffies; | |
500 | temp->server = server; | |
501 | ||
502 | /* | |
503 | * The default is for the mid to be synchronous, so the | |
504 | * default callback just wakes up the current task. | |
505 | */ | |
506 | temp->callback = cifs_wake_up_task; | |
507 | temp->callback_data = current; | |
508 | } | |
509 | ||
510 | atomic_inc(&midCount); | |
511 | temp->mid_state = MID_REQUEST_ALLOCATED; | |
512 | return temp; | |
513 | } | |
514 | ||
515 | static int | |
516 | smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf, | |
517 | struct mid_q_entry **mid) | |
518 | { | |
519 | if (ses->server->tcpStatus == CifsExiting) | |
520 | return -ENOENT; | |
521 | ||
522 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 523 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
2dc7e1c0 PS |
524 | return -EAGAIN; |
525 | } | |
526 | ||
7f48558e | 527 | if (ses->status == CifsNew) { |
2dc7e1c0 PS |
528 | if ((buf->Command != SMB2_SESSION_SETUP) && |
529 | (buf->Command != SMB2_NEGOTIATE)) | |
530 | return -EAGAIN; | |
531 | /* else ok - we are setting up session */ | |
532 | } | |
7f48558e SP |
533 | |
534 | if (ses->status == CifsExiting) { | |
535 | if (buf->Command != SMB2_LOGOFF) | |
536 | return -EAGAIN; | |
537 | /* else ok - we are shutting down the session */ | |
538 | } | |
539 | ||
2dc7e1c0 PS |
540 | *mid = smb2_mid_entry_alloc(buf, ses->server); |
541 | if (*mid == NULL) | |
542 | return -ENOMEM; | |
543 | spin_lock(&GlobalMid_Lock); | |
544 | list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); | |
545 | spin_unlock(&GlobalMid_Lock); | |
546 | return 0; | |
547 | } | |
548 | ||
549 | int | |
550 | smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
551 | bool log_error) | |
552 | { | |
553 | unsigned int len = get_rfc1002_length(mid->resp_buf); | |
0b688cfc JL |
554 | struct kvec iov; |
555 | struct smb_rqst rqst = { .rq_iov = &iov, | |
556 | .rq_nvec = 1 }; | |
557 | ||
558 | iov.iov_base = (char *)mid->resp_buf; | |
559 | iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4; | |
2dc7e1c0 PS |
560 | |
561 | dump_smb(mid->resp_buf, min_t(u32, 80, len)); | |
562 | /* convert the length into a more usable form */ | |
38d77c50 | 563 | if (len > 24 && server->sign) { |
3c1bf7e4 PS |
564 | int rc; |
565 | ||
0b688cfc | 566 | rc = smb2_verify_signature(&rqst, server); |
3c1bf7e4 | 567 | if (rc) |
f96637be JP |
568 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
569 | rc); | |
3c1bf7e4 | 570 | } |
2dc7e1c0 PS |
571 | |
572 | return map_smb2_to_linux_error(mid->resp_buf, log_error); | |
573 | } | |
574 | ||
fec344e3 JL |
575 | struct mid_q_entry * |
576 | smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
2dc7e1c0 PS |
577 | { |
578 | int rc; | |
fec344e3 | 579 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
2dc7e1c0 PS |
580 | struct mid_q_entry *mid; |
581 | ||
582 | smb2_seq_num_into_buf(ses->server, hdr); | |
583 | ||
584 | rc = smb2_get_mid_entry(ses, hdr, &mid); | |
585 | if (rc) | |
fec344e3 JL |
586 | return ERR_PTR(rc); |
587 | rc = smb2_sign_rqst(rqst, ses->server); | |
588 | if (rc) { | |
3c1bf7e4 | 589 | cifs_delete_mid(mid); |
fec344e3 JL |
590 | return ERR_PTR(rc); |
591 | } | |
592 | return mid; | |
2dc7e1c0 PS |
593 | } |
594 | ||
fec344e3 JL |
595 | struct mid_q_entry * |
596 | smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
c95b8eed | 597 | { |
fec344e3 JL |
598 | int rc; |
599 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; | |
c95b8eed PS |
600 | struct mid_q_entry *mid; |
601 | ||
602 | smb2_seq_num_into_buf(server, hdr); | |
603 | ||
604 | mid = smb2_mid_entry_alloc(hdr, server); | |
605 | if (mid == NULL) | |
fec344e3 | 606 | return ERR_PTR(-ENOMEM); |
c95b8eed | 607 | |
fec344e3 | 608 | rc = smb2_sign_rqst(rqst, server); |
c95b8eed PS |
609 | if (rc) { |
610 | DeleteMidQEntry(mid); | |
fec344e3 | 611 | return ERR_PTR(rc); |
3c1bf7e4 PS |
612 | } |
613 | ||
fec344e3 | 614 | return mid; |
c95b8eed | 615 | } |