Commit | Line | Data |
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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 PS |
137 | { |
138 | int i, rc; | |
139 | unsigned char smb2_signature[SMB2_HMACSHA256_SIZE]; | |
140 | unsigned char *sigptr = smb2_signature; | |
0b688cfc JL |
141 | struct kvec *iov = rqst->rq_iov; |
142 | int n_vec = rqst->rq_nvec; | |
3c1bf7e4 | 143 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base; |
32811d24 SP |
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 | } | |
3c1bf7e4 PS |
151 | |
152 | memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); | |
153 | memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE); | |
154 | ||
95dc8dd1 SF |
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 | ||
3c1bf7e4 | 161 | rc = crypto_shash_setkey(server->secmech.hmacsha256, |
32811d24 | 162 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); |
3c1bf7e4 | 163 | if (rc) { |
f96637be | 164 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
3c1bf7e4 PS |
165 | return rc; |
166 | } | |
167 | ||
168 | rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); | |
169 | if (rc) { | |
95dc8dd1 | 170 | cifs_dbg(VFS, "%s: Could not init sha256", __func__); |
3c1bf7e4 PS |
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) { | |
f96637be | 178 | cifs_dbg(VFS, "null iovec entry\n"); |
3c1bf7e4 PS |
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) { | |
f96637be JP |
199 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
200 | __func__); | |
3c1bf7e4 PS |
201 | return rc; |
202 | } | |
203 | } | |
204 | ||
fb308a6f JL |
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 | ||
3c1bf7e4 PS |
215 | rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash, |
216 | sigptr); | |
217 | if (rc) | |
f96637be | 218 | cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); |
3c1bf7e4 PS |
219 | |
220 | memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE); | |
221 | ||
222 | return rc; | |
223 | } | |
224 | ||
32811d24 SP |
225 | int |
226 | generate_smb3signingkey(struct cifs_ses *ses) | |
429b46f4 SF |
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); | |
32811d24 | 236 | memset(ses->smb3signingkey, 0x0, SMB3_SIGNKEY_SIZE); |
429b46f4 | 237 | |
32811d24 | 238 | rc = smb3_crypto_shash_allocate(ses->server); |
95dc8dd1 SF |
239 | if (rc) { |
240 | cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__); | |
241 | goto smb3signkey_ret; | |
242 | } | |
243 | ||
32811d24 SP |
244 | rc = crypto_shash_setkey(ses->server->secmech.hmacsha256, |
245 | ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE); | |
429b46f4 SF |
246 | if (rc) { |
247 | cifs_dbg(VFS, "%s: Could not set with session key\n", __func__); | |
248 | goto smb3signkey_ret; | |
249 | } | |
250 | ||
32811d24 | 251 | rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash); |
429b46f4 SF |
252 | if (rc) { |
253 | cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__); | |
254 | goto smb3signkey_ret; | |
255 | } | |
256 | ||
32811d24 | 257 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
258 | i, 4); |
259 | if (rc) { | |
260 | cifs_dbg(VFS, "%s: Could not update with n\n", __func__); | |
261 | goto smb3signkey_ret; | |
262 | } | |
263 | ||
32811d24 | 264 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
265 | "SMB2AESCMAC", 12); |
266 | if (rc) { | |
267 | cifs_dbg(VFS, "%s: Could not update with label\n", __func__); | |
268 | goto smb3signkey_ret; | |
269 | } | |
270 | ||
32811d24 | 271 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
272 | &zero, 1); |
273 | if (rc) { | |
274 | cifs_dbg(VFS, "%s: Could not update with zero\n", __func__); | |
275 | goto smb3signkey_ret; | |
276 | } | |
277 | ||
32811d24 | 278 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
279 | "SmbSign", 8); |
280 | if (rc) { | |
281 | cifs_dbg(VFS, "%s: Could not update with context\n", __func__); | |
282 | goto smb3signkey_ret; | |
283 | } | |
284 | ||
32811d24 | 285 | rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
286 | L, 4); |
287 | if (rc) { | |
288 | cifs_dbg(VFS, "%s: Could not update with L\n", __func__); | |
289 | goto smb3signkey_ret; | |
290 | } | |
291 | ||
32811d24 | 292 | rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash, |
429b46f4 SF |
293 | hashptr); |
294 | if (rc) { | |
295 | cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); | |
296 | goto smb3signkey_ret; | |
297 | } | |
298 | ||
32811d24 | 299 | memcpy(ses->smb3signingkey, hashptr, SMB3_SIGNKEY_SIZE); |
429b46f4 SF |
300 | |
301 | smb3signkey_ret: | |
32811d24 | 302 | return rc; |
429b46f4 SF |
303 | } |
304 | ||
38107d45 SF |
305 | int |
306 | smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) | |
307 | { | |
32811d24 SP |
308 | int i; |
309 | int rc = 0; | |
429b46f4 SF |
310 | unsigned char smb3_signature[SMB2_CMACAES_SIZE]; |
311 | unsigned char *sigptr = smb3_signature; | |
312 | struct kvec *iov = rqst->rq_iov; | |
313 | int n_vec = rqst->rq_nvec; | |
314 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base; | |
32811d24 SP |
315 | struct cifs_ses *ses; |
316 | ||
317 | ses = smb2_find_smb_ses(smb2_pdu, server); | |
318 | if (!ses) { | |
319 | cifs_dbg(VFS, "%s: Could not find session\n", __func__); | |
320 | return 0; | |
321 | } | |
429b46f4 SF |
322 | |
323 | memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE); | |
324 | memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE); | |
325 | ||
326 | rc = crypto_shash_setkey(server->secmech.cmacaes, | |
32811d24 SP |
327 | ses->smb3signingkey, SMB2_CMACAES_SIZE); |
328 | ||
429b46f4 SF |
329 | if (rc) { |
330 | cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__); | |
331 | return rc; | |
332 | } | |
333 | ||
95dc8dd1 SF |
334 | /* |
335 | * we already allocate sdesccmacaes when we init smb3 signing key, | |
336 | * so unlike smb2 case we do not have to check here if secmech are | |
337 | * initialized | |
338 | */ | |
429b46f4 SF |
339 | rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash); |
340 | if (rc) { | |
341 | cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__); | |
342 | return rc; | |
343 | } | |
344 | ||
345 | for (i = 0; i < n_vec; i++) { | |
346 | if (iov[i].iov_len == 0) | |
347 | continue; | |
348 | if (iov[i].iov_base == NULL) { | |
349 | cifs_dbg(VFS, "null iovec entry"); | |
350 | return -EIO; | |
351 | } | |
352 | /* | |
353 | * The first entry includes a length field (which does not get | |
354 | * signed that occupies the first 4 bytes before the header). | |
355 | */ | |
356 | if (i == 0) { | |
357 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ | |
358 | break; /* nothing to sign or corrupt header */ | |
359 | rc = | |
360 | crypto_shash_update( | |
361 | &server->secmech.sdesccmacaes->shash, | |
362 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
363 | } else { | |
364 | rc = | |
365 | crypto_shash_update( | |
366 | &server->secmech.sdesccmacaes->shash, | |
367 | iov[i].iov_base, iov[i].iov_len); | |
368 | } | |
369 | if (rc) { | |
370 | cifs_dbg(VFS, "%s: Couldn't update cmac aes with payload\n", | |
371 | __func__); | |
372 | return rc; | |
373 | } | |
374 | } | |
375 | ||
376 | /* now hash over the rq_pages array */ | |
377 | for (i = 0; i < rqst->rq_npages; i++) { | |
378 | struct kvec p_iov; | |
379 | ||
380 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
381 | crypto_shash_update(&server->secmech.sdesccmacaes->shash, | |
382 | p_iov.iov_base, p_iov.iov_len); | |
383 | kunmap(rqst->rq_pages[i]); | |
384 | } | |
385 | ||
386 | rc = crypto_shash_final(&server->secmech.sdesccmacaes->shash, | |
387 | sigptr); | |
388 | if (rc) | |
389 | cifs_dbg(VFS, "%s: Could not generate cmac aes\n", __func__); | |
390 | ||
391 | memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE); | |
392 | ||
393 | return rc; | |
38107d45 SF |
394 | } |
395 | ||
3c1bf7e4 PS |
396 | /* must be called with server->srv_mutex held */ |
397 | static int | |
0b688cfc | 398 | smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
399 | { |
400 | int rc = 0; | |
0b688cfc | 401 | struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
402 | |
403 | if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) || | |
404 | server->tcpStatus == CifsNeedNegotiate) | |
405 | return rc; | |
406 | ||
407 | if (!server->session_estab) { | |
408 | strncpy(smb2_pdu->Signature, "BSRSPYL", 8); | |
409 | return rc; | |
410 | } | |
411 | ||
38107d45 | 412 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
413 | |
414 | return rc; | |
415 | } | |
416 | ||
417 | int | |
0b688cfc | 418 | smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
419 | { |
420 | unsigned int rc; | |
421 | char server_response_sig[16]; | |
0b688cfc | 422 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
423 | |
424 | if ((smb2_pdu->Command == SMB2_NEGOTIATE) || | |
32811d24 | 425 | (smb2_pdu->Command == SMB2_SESSION_SETUP) || |
3c1bf7e4 PS |
426 | (smb2_pdu->Command == SMB2_OPLOCK_BREAK) || |
427 | (!server->session_estab)) | |
428 | return 0; | |
429 | ||
430 | /* | |
431 | * BB what if signatures are supposed to be on for session but | |
432 | * server does not send one? BB | |
433 | */ | |
434 | ||
435 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
436 | if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0) | |
f96637be JP |
437 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
438 | smb2_pdu->Command); | |
3c1bf7e4 PS |
439 | |
440 | /* | |
441 | * Save off the origiginal signature so we can modify the smb and check | |
442 | * our calculated signature against what the server sent. | |
443 | */ | |
444 | memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE); | |
445 | ||
446 | memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE); | |
447 | ||
448 | mutex_lock(&server->srv_mutex); | |
38107d45 | 449 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
450 | mutex_unlock(&server->srv_mutex); |
451 | ||
452 | if (rc) | |
453 | return rc; | |
454 | ||
455 | if (memcmp(server_response_sig, smb2_pdu->Signature, | |
456 | SMB2_SIGNATURE_SIZE)) | |
457 | return -EACCES; | |
458 | else | |
459 | return 0; | |
460 | } | |
461 | ||
2dc7e1c0 PS |
462 | /* |
463 | * Set message id for the request. Should be called after wait_for_free_request | |
464 | * and when srv_mutex is held. | |
465 | */ | |
466 | static inline void | |
467 | smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr) | |
468 | { | |
cb7e9eab PS |
469 | unsigned int i, num = le16_to_cpu(hdr->CreditCharge); |
470 | ||
3d378d3f | 471 | hdr->MessageId = get_next_mid64(server); |
cb7e9eab PS |
472 | /* skip message numbers according to CreditCharge field */ |
473 | for (i = 1; i < num; i++) | |
474 | get_next_mid(server); | |
2dc7e1c0 PS |
475 | } |
476 | ||
477 | static struct mid_q_entry * | |
478 | smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer, | |
479 | struct TCP_Server_Info *server) | |
480 | { | |
481 | struct mid_q_entry *temp; | |
482 | ||
483 | if (server == NULL) { | |
f96637be | 484 | cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n"); |
2dc7e1c0 PS |
485 | return NULL; |
486 | } | |
487 | ||
488 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); | |
489 | if (temp == NULL) | |
490 | return temp; | |
491 | else { | |
492 | memset(temp, 0, sizeof(struct mid_q_entry)); | |
9235d098 | 493 | temp->mid = le64_to_cpu(smb_buffer->MessageId); |
2dc7e1c0 PS |
494 | temp->pid = current->pid; |
495 | temp->command = smb_buffer->Command; /* Always LE */ | |
496 | temp->when_alloc = jiffies; | |
497 | temp->server = server; | |
498 | ||
499 | /* | |
500 | * The default is for the mid to be synchronous, so the | |
501 | * default callback just wakes up the current task. | |
502 | */ | |
503 | temp->callback = cifs_wake_up_task; | |
504 | temp->callback_data = current; | |
505 | } | |
506 | ||
507 | atomic_inc(&midCount); | |
508 | temp->mid_state = MID_REQUEST_ALLOCATED; | |
509 | return temp; | |
510 | } | |
511 | ||
512 | static int | |
513 | smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf, | |
514 | struct mid_q_entry **mid) | |
515 | { | |
516 | if (ses->server->tcpStatus == CifsExiting) | |
517 | return -ENOENT; | |
518 | ||
519 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 520 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
2dc7e1c0 PS |
521 | return -EAGAIN; |
522 | } | |
523 | ||
7f48558e | 524 | if (ses->status == CifsNew) { |
2dc7e1c0 PS |
525 | if ((buf->Command != SMB2_SESSION_SETUP) && |
526 | (buf->Command != SMB2_NEGOTIATE)) | |
527 | return -EAGAIN; | |
528 | /* else ok - we are setting up session */ | |
529 | } | |
7f48558e SP |
530 | |
531 | if (ses->status == CifsExiting) { | |
532 | if (buf->Command != SMB2_LOGOFF) | |
533 | return -EAGAIN; | |
534 | /* else ok - we are shutting down the session */ | |
535 | } | |
536 | ||
2dc7e1c0 PS |
537 | *mid = smb2_mid_entry_alloc(buf, ses->server); |
538 | if (*mid == NULL) | |
539 | return -ENOMEM; | |
540 | spin_lock(&GlobalMid_Lock); | |
541 | list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); | |
542 | spin_unlock(&GlobalMid_Lock); | |
543 | return 0; | |
544 | } | |
545 | ||
546 | int | |
547 | smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
548 | bool log_error) | |
549 | { | |
550 | unsigned int len = get_rfc1002_length(mid->resp_buf); | |
0b688cfc JL |
551 | struct kvec iov; |
552 | struct smb_rqst rqst = { .rq_iov = &iov, | |
553 | .rq_nvec = 1 }; | |
554 | ||
555 | iov.iov_base = (char *)mid->resp_buf; | |
556 | iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4; | |
2dc7e1c0 PS |
557 | |
558 | dump_smb(mid->resp_buf, min_t(u32, 80, len)); | |
559 | /* convert the length into a more usable form */ | |
38d77c50 | 560 | if (len > 24 && server->sign) { |
3c1bf7e4 PS |
561 | int rc; |
562 | ||
0b688cfc | 563 | rc = smb2_verify_signature(&rqst, server); |
3c1bf7e4 | 564 | if (rc) |
f96637be JP |
565 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
566 | rc); | |
3c1bf7e4 | 567 | } |
2dc7e1c0 PS |
568 | |
569 | return map_smb2_to_linux_error(mid->resp_buf, log_error); | |
570 | } | |
571 | ||
fec344e3 JL |
572 | struct mid_q_entry * |
573 | smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
2dc7e1c0 PS |
574 | { |
575 | int rc; | |
fec344e3 | 576 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
2dc7e1c0 PS |
577 | struct mid_q_entry *mid; |
578 | ||
579 | smb2_seq_num_into_buf(ses->server, hdr); | |
580 | ||
581 | rc = smb2_get_mid_entry(ses, hdr, &mid); | |
582 | if (rc) | |
fec344e3 JL |
583 | return ERR_PTR(rc); |
584 | rc = smb2_sign_rqst(rqst, ses->server); | |
585 | if (rc) { | |
3c1bf7e4 | 586 | cifs_delete_mid(mid); |
fec344e3 JL |
587 | return ERR_PTR(rc); |
588 | } | |
589 | return mid; | |
2dc7e1c0 PS |
590 | } |
591 | ||
fec344e3 JL |
592 | struct mid_q_entry * |
593 | smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
c95b8eed | 594 | { |
fec344e3 JL |
595 | int rc; |
596 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; | |
c95b8eed PS |
597 | struct mid_q_entry *mid; |
598 | ||
599 | smb2_seq_num_into_buf(server, hdr); | |
600 | ||
601 | mid = smb2_mid_entry_alloc(hdr, server); | |
602 | if (mid == NULL) | |
fec344e3 | 603 | return ERR_PTR(-ENOMEM); |
c95b8eed | 604 | |
fec344e3 | 605 | rc = smb2_sign_rqst(rqst, server); |
c95b8eed PS |
606 | if (rc) { |
607 | DeleteMidQEntry(mid); | |
fec344e3 | 608 | return ERR_PTR(rc); |
3c1bf7e4 PS |
609 | } |
610 | ||
fec344e3 | 611 | return mid; |
c95b8eed | 612 | } |