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ec2e4523 PS |
1 | /* |
2 | * fs/cifs/smb2pdu.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2009, 2011 | |
5 | * Etersoft, 2012 | |
6 | * Author(s): Steve French (sfrench@us.ibm.com) | |
7 | * Pavel Shilovsky (pshilovsky@samba.org) 2012 | |
8 | * | |
9 | * Contains the routines for constructing the SMB2 PDUs themselves | |
10 | * | |
11 | * This library is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU Lesser General Public License as published | |
13 | * by the Free Software Foundation; either version 2.1 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This library is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
19 | * the GNU Lesser General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU Lesser General Public License | |
22 | * along with this library; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
25 | ||
26 | /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */ | |
27 | /* Note that there are handle based routines which must be */ | |
28 | /* treated slightly differently for reconnection purposes since we never */ | |
29 | /* want to reuse a stale file handle and only the caller knows the file info */ | |
30 | ||
31 | #include <linux/fs.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/vfs.h> | |
09a4707e | 34 | #include <linux/task_io_accounting_ops.h> |
ec2e4523 | 35 | #include <linux/uaccess.h> |
33319141 | 36 | #include <linux/pagemap.h> |
ec2e4523 PS |
37 | #include <linux/xattr.h> |
38 | #include "smb2pdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsacl.h" | |
41 | #include "cifsproto.h" | |
42 | #include "smb2proto.h" | |
43 | #include "cifs_unicode.h" | |
44 | #include "cifs_debug.h" | |
45 | #include "ntlmssp.h" | |
46 | #include "smb2status.h" | |
09a4707e | 47 | #include "smb2glob.h" |
ec2e4523 PS |
48 | |
49 | /* | |
50 | * The following table defines the expected "StructureSize" of SMB2 requests | |
51 | * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. | |
52 | * | |
53 | * Note that commands are defined in smb2pdu.h in le16 but the array below is | |
54 | * indexed by command in host byte order. | |
55 | */ | |
56 | static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { | |
57 | /* SMB2_NEGOTIATE */ 36, | |
58 | /* SMB2_SESSION_SETUP */ 25, | |
59 | /* SMB2_LOGOFF */ 4, | |
60 | /* SMB2_TREE_CONNECT */ 9, | |
61 | /* SMB2_TREE_DISCONNECT */ 4, | |
62 | /* SMB2_CREATE */ 57, | |
63 | /* SMB2_CLOSE */ 24, | |
64 | /* SMB2_FLUSH */ 24, | |
65 | /* SMB2_READ */ 49, | |
66 | /* SMB2_WRITE */ 49, | |
67 | /* SMB2_LOCK */ 48, | |
68 | /* SMB2_IOCTL */ 57, | |
69 | /* SMB2_CANCEL */ 4, | |
70 | /* SMB2_ECHO */ 4, | |
71 | /* SMB2_QUERY_DIRECTORY */ 33, | |
72 | /* SMB2_CHANGE_NOTIFY */ 32, | |
73 | /* SMB2_QUERY_INFO */ 41, | |
74 | /* SMB2_SET_INFO */ 33, | |
75 | /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ | |
76 | }; | |
77 | ||
78 | ||
79 | static void | |
80 | smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ , | |
81 | const struct cifs_tcon *tcon) | |
82 | { | |
83 | struct smb2_pdu *pdu = (struct smb2_pdu *)hdr; | |
84 | char *temp = (char *)hdr; | |
85 | /* lookup word count ie StructureSize from table */ | |
86 | __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)]; | |
87 | ||
88 | /* | |
89 | * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of | |
90 | * largest operations (Create) | |
91 | */ | |
92 | memset(temp, 0, 256); | |
93 | ||
94 | /* Note this is only network field converted to big endian */ | |
95 | hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr) | |
96 | - 4 /* RFC 1001 length field itself not counted */); | |
97 | ||
98 | hdr->ProtocolId[0] = 0xFE; | |
99 | hdr->ProtocolId[1] = 'S'; | |
100 | hdr->ProtocolId[2] = 'M'; | |
101 | hdr->ProtocolId[3] = 'B'; | |
102 | hdr->StructureSize = cpu_to_le16(64); | |
103 | hdr->Command = smb2_cmd; | |
104 | hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */ | |
105 | hdr->ProcessId = cpu_to_le32((__u16)current->tgid); | |
106 | ||
107 | if (!tcon) | |
108 | goto out; | |
109 | ||
110 | hdr->TreeId = tcon->tid; | |
111 | /* Uid is not converted */ | |
112 | if (tcon->ses) | |
113 | hdr->SessionId = tcon->ses->Suid; | |
114 | /* BB check following DFS flags BB */ | |
115 | /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */ | |
faaf946a PS |
116 | if (tcon->share_flags & SHI1005_FLAGS_DFS) |
117 | hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; | |
ec2e4523 PS |
118 | /* BB how does SMB2 do case sensitive? */ |
119 | /* if (tcon->nocase) | |
120 | hdr->Flags |= SMBFLG_CASELESS; */ | |
3c1bf7e4 | 121 | if (tcon->ses && tcon->ses->server && |
ec2e4523 | 122 | (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED)) |
3c1bf7e4 | 123 | hdr->Flags |= SMB2_FLAGS_SIGNED; |
ec2e4523 PS |
124 | out: |
125 | pdu->StructureSize2 = cpu_to_le16(parmsize); | |
126 | return; | |
127 | } | |
128 | ||
129 | static int | |
130 | smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon) | |
131 | { | |
132 | int rc = 0; | |
aa24d1e9 PS |
133 | struct nls_table *nls_codepage; |
134 | struct cifs_ses *ses; | |
135 | struct TCP_Server_Info *server; | |
136 | ||
137 | /* | |
138 | * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so | |
139 | * check for tcp and smb session status done differently | |
140 | * for those three - in the calling routine. | |
141 | */ | |
142 | if (tcon == NULL) | |
143 | return rc; | |
144 | ||
145 | if (smb2_command == SMB2_TREE_CONNECT) | |
146 | return rc; | |
147 | ||
148 | if (tcon->tidStatus == CifsExiting) { | |
149 | /* | |
150 | * only tree disconnect, open, and write, | |
151 | * (and ulogoff which does not have tcon) | |
152 | * are allowed as we start force umount. | |
153 | */ | |
154 | if ((smb2_command != SMB2_WRITE) && | |
155 | (smb2_command != SMB2_CREATE) && | |
156 | (smb2_command != SMB2_TREE_DISCONNECT)) { | |
157 | cFYI(1, "can not send cmd %d while umounting", | |
158 | smb2_command); | |
159 | return -ENODEV; | |
160 | } | |
161 | } | |
162 | if ((!tcon->ses) || (tcon->ses->status == CifsExiting) || | |
163 | (!tcon->ses->server)) | |
164 | return -EIO; | |
165 | ||
166 | ses = tcon->ses; | |
167 | server = ses->server; | |
168 | ||
169 | /* | |
170 | * Give demultiplex thread up to 10 seconds to reconnect, should be | |
171 | * greater than cifs socket timeout which is 7 seconds | |
172 | */ | |
173 | while (server->tcpStatus == CifsNeedReconnect) { | |
174 | /* | |
175 | * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE | |
176 | * here since they are implicitly done when session drops. | |
177 | */ | |
178 | switch (smb2_command) { | |
179 | /* | |
180 | * BB Should we keep oplock break and add flush to exceptions? | |
181 | */ | |
182 | case SMB2_TREE_DISCONNECT: | |
183 | case SMB2_CANCEL: | |
184 | case SMB2_CLOSE: | |
185 | case SMB2_OPLOCK_BREAK: | |
186 | return -EAGAIN; | |
187 | } | |
188 | ||
189 | wait_event_interruptible_timeout(server->response_q, | |
190 | (server->tcpStatus != CifsNeedReconnect), 10 * HZ); | |
191 | ||
192 | /* are we still trying to reconnect? */ | |
193 | if (server->tcpStatus != CifsNeedReconnect) | |
194 | break; | |
195 | ||
196 | /* | |
197 | * on "soft" mounts we wait once. Hard mounts keep | |
198 | * retrying until process is killed or server comes | |
199 | * back on-line | |
200 | */ | |
201 | if (!tcon->retry) { | |
202 | cFYI(1, "gave up waiting on reconnect in smb_init"); | |
203 | return -EHOSTDOWN; | |
204 | } | |
205 | } | |
206 | ||
207 | if (!tcon->ses->need_reconnect && !tcon->need_reconnect) | |
208 | return rc; | |
209 | ||
210 | nls_codepage = load_nls_default(); | |
211 | ||
212 | /* | |
213 | * need to prevent multiple threads trying to simultaneously reconnect | |
214 | * the same SMB session | |
215 | */ | |
216 | mutex_lock(&tcon->ses->session_mutex); | |
217 | rc = cifs_negotiate_protocol(0, tcon->ses); | |
218 | if (!rc && tcon->ses->need_reconnect) | |
219 | rc = cifs_setup_session(0, tcon->ses, nls_codepage); | |
220 | ||
221 | if (rc || !tcon->need_reconnect) { | |
222 | mutex_unlock(&tcon->ses->session_mutex); | |
223 | goto out; | |
224 | } | |
225 | ||
226 | cifs_mark_open_files_invalid(tcon); | |
227 | rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage); | |
228 | mutex_unlock(&tcon->ses->session_mutex); | |
229 | cFYI(1, "reconnect tcon rc = %d", rc); | |
230 | if (rc) | |
231 | goto out; | |
232 | atomic_inc(&tconInfoReconnectCount); | |
233 | /* | |
234 | * BB FIXME add code to check if wsize needs update due to negotiated | |
235 | * smb buffer size shrinking. | |
236 | */ | |
237 | out: | |
238 | /* | |
239 | * Check if handle based operation so we know whether we can continue | |
240 | * or not without returning to caller to reset file handle. | |
241 | */ | |
242 | /* | |
243 | * BB Is flush done by server on drop of tcp session? Should we special | |
244 | * case it and skip above? | |
245 | */ | |
246 | switch (smb2_command) { | |
247 | case SMB2_FLUSH: | |
248 | case SMB2_READ: | |
249 | case SMB2_WRITE: | |
250 | case SMB2_LOCK: | |
251 | case SMB2_IOCTL: | |
252 | case SMB2_QUERY_DIRECTORY: | |
253 | case SMB2_CHANGE_NOTIFY: | |
254 | case SMB2_QUERY_INFO: | |
255 | case SMB2_SET_INFO: | |
256 | return -EAGAIN; | |
257 | } | |
258 | unload_nls(nls_codepage); | |
ec2e4523 PS |
259 | return rc; |
260 | } | |
261 | ||
262 | /* | |
263 | * Allocate and return pointer to an SMB request hdr, and set basic | |
264 | * SMB information in the SMB header. If the return code is zero, this | |
265 | * function must have filled in request_buf pointer. | |
266 | */ | |
267 | static int | |
268 | small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon, | |
269 | void **request_buf) | |
270 | { | |
271 | int rc = 0; | |
272 | ||
273 | rc = smb2_reconnect(smb2_command, tcon); | |
274 | if (rc) | |
275 | return rc; | |
276 | ||
277 | /* BB eventually switch this to SMB2 specific small buf size */ | |
278 | *request_buf = cifs_small_buf_get(); | |
279 | if (*request_buf == NULL) { | |
280 | /* BB should we add a retry in here if not a writepage? */ | |
281 | return -ENOMEM; | |
282 | } | |
283 | ||
284 | smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon); | |
285 | ||
286 | if (tcon != NULL) { | |
287 | #ifdef CONFIG_CIFS_STATS2 | |
ec2e4523 PS |
288 | uint16_t com_code = le16_to_cpu(smb2_command); |
289 | cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); | |
ec2e4523 PS |
290 | #endif |
291 | cifs_stats_inc(&tcon->num_smbs_sent); | |
292 | } | |
293 | ||
294 | return rc; | |
295 | } | |
296 | ||
297 | static void | |
298 | free_rsp_buf(int resp_buftype, void *rsp) | |
299 | { | |
300 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
301 | cifs_small_buf_release(rsp); | |
302 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
303 | cifs_buf_release(rsp); | |
304 | } | |
305 | ||
306 | #define SMB2_NUM_PROT 1 | |
307 | ||
308 | #define SMB2_PROT 0 | |
309 | #define SMB21_PROT 1 | |
310 | #define BAD_PROT 0xFFFF | |
311 | ||
312 | #define SMB2_PROT_ID 0x0202 | |
313 | #define SMB21_PROT_ID 0x0210 | |
314 | #define BAD_PROT_ID 0xFFFF | |
315 | ||
316 | static struct { | |
317 | int index; | |
318 | __le16 name; | |
319 | } smb2protocols[] = { | |
320 | {SMB2_PROT, cpu_to_le16(SMB2_PROT_ID)}, | |
321 | {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)}, | |
322 | {BAD_PROT, cpu_to_le16(BAD_PROT_ID)} | |
323 | }; | |
324 | ||
325 | /* | |
326 | * | |
327 | * SMB2 Worker functions follow: | |
328 | * | |
329 | * The general structure of the worker functions is: | |
330 | * 1) Call smb2_init (assembles SMB2 header) | |
331 | * 2) Initialize SMB2 command specific fields in fixed length area of SMB | |
332 | * 3) Call smb_sendrcv2 (sends request on socket and waits for response) | |
333 | * 4) Decode SMB2 command specific fields in the fixed length area | |
334 | * 5) Decode variable length data area (if any for this SMB2 command type) | |
335 | * 6) Call free smb buffer | |
336 | * 7) return | |
337 | * | |
338 | */ | |
339 | ||
340 | int | |
341 | SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) | |
342 | { | |
343 | struct smb2_negotiate_req *req; | |
344 | struct smb2_negotiate_rsp *rsp; | |
345 | struct kvec iov[1]; | |
346 | int rc = 0; | |
347 | int resp_buftype; | |
348 | struct TCP_Server_Info *server; | |
349 | unsigned int sec_flags; | |
350 | u16 i; | |
351 | u16 temp = 0; | |
352 | int blob_offset, blob_length; | |
353 | char *security_blob; | |
354 | int flags = CIFS_NEG_OP; | |
355 | ||
356 | cFYI(1, "Negotiate protocol"); | |
357 | ||
358 | if (ses->server) | |
359 | server = ses->server; | |
360 | else { | |
361 | rc = -EIO; | |
362 | return rc; | |
363 | } | |
364 | ||
365 | rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req); | |
366 | if (rc) | |
367 | return rc; | |
368 | ||
369 | /* if any of auth flags (ie not sign or seal) are overriden use them */ | |
370 | if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) | |
371 | sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/ | |
372 | else /* if override flags set only sign/seal OR them with global auth */ | |
373 | sec_flags = global_secflags | ses->overrideSecFlg; | |
374 | ||
375 | cFYI(1, "sec_flags 0x%x", sec_flags); | |
376 | ||
377 | req->hdr.SessionId = 0; | |
378 | ||
379 | for (i = 0; i < SMB2_NUM_PROT; i++) | |
380 | req->Dialects[i] = smb2protocols[i].name; | |
381 | ||
382 | req->DialectCount = cpu_to_le16(i); | |
383 | inc_rfc1001_len(req, i * 2); | |
384 | ||
385 | /* only one of SMB2 signing flags may be set in SMB2 request */ | |
386 | if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) | |
387 | temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; | |
388 | else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */ | |
389 | temp = SMB2_NEGOTIATE_SIGNING_ENABLED; | |
390 | ||
391 | req->SecurityMode = cpu_to_le16(temp); | |
392 | ||
393 | req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS); | |
394 | ||
395 | iov[0].iov_base = (char *)req; | |
396 | /* 4 for rfc1002 length field */ | |
397 | iov[0].iov_len = get_rfc1002_length(req) + 4; | |
398 | ||
399 | rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags); | |
400 | ||
401 | rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base; | |
402 | /* | |
403 | * No tcon so can't do | |
404 | * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); | |
405 | */ | |
406 | if (rc != 0) | |
407 | goto neg_exit; | |
408 | ||
409 | if (rsp == NULL) { | |
410 | rc = -EIO; | |
411 | goto neg_exit; | |
412 | } | |
413 | ||
414 | cFYI(1, "mode 0x%x", rsp->SecurityMode); | |
415 | ||
416 | if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name) | |
417 | cFYI(1, "negotiated smb2.1 dialect"); | |
418 | else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name) | |
419 | cFYI(1, "negotiated smb2 dialect"); | |
420 | else { | |
421 | cERROR(1, "Illegal dialect returned by server %d", | |
422 | le16_to_cpu(rsp->DialectRevision)); | |
423 | rc = -EIO; | |
424 | goto neg_exit; | |
425 | } | |
426 | server->dialect = le16_to_cpu(rsp->DialectRevision); | |
427 | ||
428 | server->maxBuf = le32_to_cpu(rsp->MaxTransactSize); | |
429 | server->max_read = le32_to_cpu(rsp->MaxReadSize); | |
430 | server->max_write = le32_to_cpu(rsp->MaxWriteSize); | |
431 | /* BB Do we need to validate the SecurityMode? */ | |
432 | server->sec_mode = le16_to_cpu(rsp->SecurityMode); | |
433 | server->capabilities = le32_to_cpu(rsp->Capabilities); | |
29e20f9c PS |
434 | /* Internal types */ |
435 | server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; | |
ec2e4523 PS |
436 | |
437 | security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, | |
438 | &rsp->hdr); | |
439 | if (blob_length == 0) { | |
440 | cERROR(1, "missing security blob on negprot"); | |
441 | rc = -EIO; | |
442 | goto neg_exit; | |
443 | } | |
3c1bf7e4 PS |
444 | |
445 | cFYI(1, "sec_flags 0x%x", sec_flags); | |
446 | if (sec_flags & CIFSSEC_MUST_SIGN) { | |
447 | cFYI(1, "Signing required"); | |
448 | if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED | | |
449 | SMB2_NEGOTIATE_SIGNING_ENABLED))) { | |
450 | cERROR(1, "signing required but server lacks support"); | |
451 | rc = -EOPNOTSUPP; | |
452 | goto neg_exit; | |
453 | } | |
454 | server->sec_mode |= SECMODE_SIGN_REQUIRED; | |
455 | } else if (sec_flags & CIFSSEC_MAY_SIGN) { | |
456 | cFYI(1, "Signing optional"); | |
457 | if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { | |
458 | cFYI(1, "Server requires signing"); | |
459 | server->sec_mode |= SECMODE_SIGN_REQUIRED; | |
460 | } else { | |
461 | server->sec_mode &= | |
462 | ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); | |
463 | } | |
464 | } else { | |
465 | cFYI(1, "Signing disabled"); | |
466 | if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) { | |
467 | cERROR(1, "Server requires packet signing to be enabled" | |
468 | " in /proc/fs/cifs/SecurityFlags."); | |
469 | rc = -EOPNOTSUPP; | |
470 | goto neg_exit; | |
471 | } | |
472 | server->sec_mode &= | |
473 | ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED); | |
474 | } | |
475 | ||
ec2e4523 PS |
476 | #ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */ |
477 | rc = decode_neg_token_init(security_blob, blob_length, | |
478 | &server->sec_type); | |
479 | if (rc == 1) | |
480 | rc = 0; | |
481 | else if (rc == 0) { | |
482 | rc = -EIO; | |
483 | goto neg_exit; | |
484 | } | |
485 | #endif | |
486 | ||
487 | neg_exit: | |
488 | free_rsp_buf(resp_buftype, rsp); | |
489 | return rc; | |
490 | } | |
5478f9ba PS |
491 | |
492 | int | |
493 | SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, | |
494 | const struct nls_table *nls_cp) | |
495 | { | |
496 | struct smb2_sess_setup_req *req; | |
497 | struct smb2_sess_setup_rsp *rsp = NULL; | |
498 | struct kvec iov[2]; | |
499 | int rc = 0; | |
500 | int resp_buftype; | |
501 | __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */ | |
502 | struct TCP_Server_Info *server; | |
503 | unsigned int sec_flags; | |
504 | u8 temp = 0; | |
505 | u16 blob_length = 0; | |
506 | char *security_blob; | |
507 | char *ntlmssp_blob = NULL; | |
508 | bool use_spnego = false; /* else use raw ntlmssp */ | |
509 | ||
510 | cFYI(1, "Session Setup"); | |
511 | ||
512 | if (ses->server) | |
513 | server = ses->server; | |
514 | else { | |
515 | rc = -EIO; | |
516 | return rc; | |
517 | } | |
518 | ||
519 | /* | |
520 | * If memory allocation is successful, caller of this function | |
521 | * frees it. | |
522 | */ | |
523 | ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); | |
524 | if (!ses->ntlmssp) | |
525 | return -ENOMEM; | |
526 | ||
527 | ses->server->secType = RawNTLMSSP; | |
528 | ||
529 | ssetup_ntlmssp_authenticate: | |
530 | if (phase == NtLmChallenge) | |
531 | phase = NtLmAuthenticate; /* if ntlmssp, now final phase */ | |
532 | ||
533 | rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req); | |
534 | if (rc) | |
535 | return rc; | |
536 | ||
537 | /* if any of auth flags (ie not sign or seal) are overriden use them */ | |
538 | if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) | |
539 | sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/ | |
540 | else /* if override flags set only sign/seal OR them with global auth */ | |
541 | sec_flags = global_secflags | ses->overrideSecFlg; | |
542 | ||
543 | cFYI(1, "sec_flags 0x%x", sec_flags); | |
544 | ||
545 | req->hdr.SessionId = 0; /* First session, not a reauthenticate */ | |
546 | req->VcNumber = 0; /* MBZ */ | |
547 | /* to enable echos and oplocks */ | |
548 | req->hdr.CreditRequest = cpu_to_le16(3); | |
549 | ||
550 | /* only one of SMB2 signing flags may be set in SMB2 request */ | |
551 | if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) | |
552 | temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; | |
553 | else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) | |
554 | temp = SMB2_NEGOTIATE_SIGNING_REQUIRED; | |
555 | else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */ | |
556 | temp = SMB2_NEGOTIATE_SIGNING_ENABLED; | |
557 | ||
558 | req->SecurityMode = temp; | |
559 | req->Capabilities = 0; | |
560 | req->Channel = 0; /* MBZ */ | |
561 | ||
562 | iov[0].iov_base = (char *)req; | |
563 | /* 4 for rfc1002 length field and 1 for pad */ | |
564 | iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; | |
565 | if (phase == NtLmNegotiate) { | |
566 | ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE), | |
567 | GFP_KERNEL); | |
568 | if (ntlmssp_blob == NULL) { | |
569 | rc = -ENOMEM; | |
570 | goto ssetup_exit; | |
571 | } | |
572 | build_ntlmssp_negotiate_blob(ntlmssp_blob, ses); | |
573 | if (use_spnego) { | |
574 | /* blob_length = build_spnego_ntlmssp_blob( | |
575 | &security_blob, | |
576 | sizeof(struct _NEGOTIATE_MESSAGE), | |
577 | ntlmssp_blob); */ | |
578 | /* BB eventually need to add this */ | |
579 | cERROR(1, "spnego not supported for SMB2 yet"); | |
580 | rc = -EOPNOTSUPP; | |
581 | kfree(ntlmssp_blob); | |
582 | goto ssetup_exit; | |
583 | } else { | |
584 | blob_length = sizeof(struct _NEGOTIATE_MESSAGE); | |
585 | /* with raw NTLMSSP we don't encapsulate in SPNEGO */ | |
586 | security_blob = ntlmssp_blob; | |
587 | } | |
588 | } else if (phase == NtLmAuthenticate) { | |
589 | req->hdr.SessionId = ses->Suid; | |
590 | ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500, | |
591 | GFP_KERNEL); | |
592 | if (ntlmssp_blob == NULL) { | |
593 | cERROR(1, "failed to malloc ntlmssp blob"); | |
594 | rc = -ENOMEM; | |
595 | goto ssetup_exit; | |
596 | } | |
597 | rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses, | |
598 | nls_cp); | |
599 | if (rc) { | |
600 | cFYI(1, "build_ntlmssp_auth_blob failed %d", rc); | |
601 | goto ssetup_exit; /* BB double check error handling */ | |
602 | } | |
603 | if (use_spnego) { | |
604 | /* blob_length = build_spnego_ntlmssp_blob( | |
605 | &security_blob, | |
606 | blob_length, | |
607 | ntlmssp_blob); */ | |
608 | cERROR(1, "spnego not supported for SMB2 yet"); | |
609 | rc = -EOPNOTSUPP; | |
610 | kfree(ntlmssp_blob); | |
611 | goto ssetup_exit; | |
612 | } else { | |
613 | security_blob = ntlmssp_blob; | |
614 | } | |
615 | } else { | |
616 | cERROR(1, "illegal ntlmssp phase"); | |
617 | rc = -EIO; | |
618 | goto ssetup_exit; | |
619 | } | |
620 | ||
621 | /* Testing shows that buffer offset must be at location of Buffer[0] */ | |
622 | req->SecurityBufferOffset = | |
623 | cpu_to_le16(sizeof(struct smb2_sess_setup_req) - | |
624 | 1 /* pad */ - 4 /* rfc1001 len */); | |
625 | req->SecurityBufferLength = cpu_to_le16(blob_length); | |
626 | iov[1].iov_base = security_blob; | |
627 | iov[1].iov_len = blob_length; | |
628 | ||
629 | inc_rfc1001_len(req, blob_length - 1 /* pad */); | |
630 | ||
631 | /* BB add code to build os and lm fields */ | |
632 | ||
633 | rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR); | |
634 | ||
635 | kfree(security_blob); | |
636 | rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base; | |
637 | if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) { | |
638 | if (phase != NtLmNegotiate) { | |
639 | cERROR(1, "Unexpected more processing error"); | |
640 | goto ssetup_exit; | |
641 | } | |
642 | if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 != | |
643 | le16_to_cpu(rsp->SecurityBufferOffset)) { | |
644 | cERROR(1, "Invalid security buffer offset %d", | |
645 | le16_to_cpu(rsp->SecurityBufferOffset)); | |
646 | rc = -EIO; | |
647 | goto ssetup_exit; | |
648 | } | |
649 | ||
650 | /* NTLMSSP Negotiate sent now processing challenge (response) */ | |
651 | phase = NtLmChallenge; /* process ntlmssp challenge */ | |
652 | rc = 0; /* MORE_PROCESSING is not an error here but expected */ | |
653 | ses->Suid = rsp->hdr.SessionId; | |
654 | rc = decode_ntlmssp_challenge(rsp->Buffer, | |
655 | le16_to_cpu(rsp->SecurityBufferLength), ses); | |
656 | } | |
657 | ||
658 | /* | |
659 | * BB eventually add code for SPNEGO decoding of NtlmChallenge blob, | |
660 | * but at least the raw NTLMSSP case works. | |
661 | */ | |
662 | /* | |
663 | * No tcon so can't do | |
664 | * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); | |
665 | */ | |
666 | if (rc != 0) | |
667 | goto ssetup_exit; | |
668 | ||
669 | if (rsp == NULL) { | |
670 | rc = -EIO; | |
671 | goto ssetup_exit; | |
672 | } | |
673 | ||
674 | ses->session_flags = le16_to_cpu(rsp->SessionFlags); | |
675 | ssetup_exit: | |
676 | free_rsp_buf(resp_buftype, rsp); | |
677 | ||
678 | /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */ | |
679 | if ((phase == NtLmChallenge) && (rc == 0)) | |
680 | goto ssetup_ntlmssp_authenticate; | |
681 | return rc; | |
682 | } | |
683 | ||
684 | int | |
685 | SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) | |
686 | { | |
687 | struct smb2_logoff_req *req; /* response is also trivial struct */ | |
688 | int rc = 0; | |
689 | struct TCP_Server_Info *server; | |
690 | ||
691 | cFYI(1, "disconnect session %p", ses); | |
692 | ||
693 | if (ses && (ses->server)) | |
694 | server = ses->server; | |
695 | else | |
696 | return -EIO; | |
697 | ||
698 | rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req); | |
699 | if (rc) | |
700 | return rc; | |
701 | ||
702 | /* since no tcon, smb2_init can not do this, so do here */ | |
703 | req->hdr.SessionId = ses->Suid; | |
3c1bf7e4 PS |
704 | if (server->sec_mode & SECMODE_SIGN_REQUIRED) |
705 | req->hdr.Flags |= SMB2_FLAGS_SIGNED; | |
5478f9ba PS |
706 | |
707 | rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0); | |
708 | /* | |
709 | * No tcon so can't do | |
710 | * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); | |
711 | */ | |
712 | return rc; | |
713 | } | |
faaf946a PS |
714 | |
715 | static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code) | |
716 | { | |
d60622eb | 717 | cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]); |
faaf946a PS |
718 | } |
719 | ||
720 | #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */) | |
721 | ||
722 | int | |
723 | SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, | |
724 | struct cifs_tcon *tcon, const struct nls_table *cp) | |
725 | { | |
726 | struct smb2_tree_connect_req *req; | |
727 | struct smb2_tree_connect_rsp *rsp = NULL; | |
728 | struct kvec iov[2]; | |
729 | int rc = 0; | |
730 | int resp_buftype; | |
731 | int unc_path_len; | |
732 | struct TCP_Server_Info *server; | |
733 | __le16 *unc_path = NULL; | |
734 | ||
735 | cFYI(1, "TCON"); | |
736 | ||
737 | if ((ses->server) && tree) | |
738 | server = ses->server; | |
739 | else | |
740 | return -EIO; | |
741 | ||
742 | if (tcon && tcon->bad_network_name) | |
743 | return -ENOENT; | |
744 | ||
745 | unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); | |
746 | if (unc_path == NULL) | |
747 | return -ENOMEM; | |
748 | ||
749 | unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1; | |
750 | unc_path_len *= 2; | |
751 | if (unc_path_len < 2) { | |
752 | kfree(unc_path); | |
753 | return -EINVAL; | |
754 | } | |
755 | ||
756 | rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req); | |
757 | if (rc) { | |
758 | kfree(unc_path); | |
759 | return rc; | |
760 | } | |
761 | ||
762 | if (tcon == NULL) { | |
763 | /* since no tcon, smb2_init can not do this, so do here */ | |
764 | req->hdr.SessionId = ses->Suid; | |
765 | /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED) | |
766 | req->hdr.Flags |= SMB2_FLAGS_SIGNED; */ | |
767 | } | |
768 | ||
769 | iov[0].iov_base = (char *)req; | |
770 | /* 4 for rfc1002 length field and 1 for pad */ | |
771 | iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; | |
772 | ||
773 | /* Testing shows that buffer offset must be at location of Buffer[0] */ | |
774 | req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req) | |
775 | - 1 /* pad */ - 4 /* do not count rfc1001 len field */); | |
776 | req->PathLength = cpu_to_le16(unc_path_len - 2); | |
777 | iov[1].iov_base = unc_path; | |
778 | iov[1].iov_len = unc_path_len; | |
779 | ||
780 | inc_rfc1001_len(req, unc_path_len - 1 /* pad */); | |
781 | ||
782 | rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0); | |
783 | rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base; | |
784 | ||
785 | if (rc != 0) { | |
786 | if (tcon) { | |
787 | cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); | |
788 | tcon->need_reconnect = true; | |
789 | } | |
790 | goto tcon_error_exit; | |
791 | } | |
792 | ||
793 | if (rsp == NULL) { | |
794 | rc = -EIO; | |
795 | goto tcon_exit; | |
796 | } | |
797 | ||
798 | if (tcon == NULL) { | |
799 | ses->ipc_tid = rsp->hdr.TreeId; | |
800 | goto tcon_exit; | |
801 | } | |
802 | ||
803 | if (rsp->ShareType & SMB2_SHARE_TYPE_DISK) | |
804 | cFYI(1, "connection to disk share"); | |
805 | else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) { | |
806 | tcon->ipc = true; | |
807 | cFYI(1, "connection to pipe share"); | |
808 | } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) { | |
809 | tcon->print = true; | |
810 | cFYI(1, "connection to printer"); | |
811 | } else { | |
812 | cERROR(1, "unknown share type %d", rsp->ShareType); | |
813 | rc = -EOPNOTSUPP; | |
814 | goto tcon_error_exit; | |
815 | } | |
816 | ||
817 | tcon->share_flags = le32_to_cpu(rsp->ShareFlags); | |
818 | tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); | |
819 | tcon->tidStatus = CifsGood; | |
820 | tcon->need_reconnect = false; | |
821 | tcon->tid = rsp->hdr.TreeId; | |
822 | strncpy(tcon->treeName, tree, MAX_TREE_SIZE); | |
823 | ||
824 | if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && | |
825 | ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) | |
826 | cERROR(1, "DFS capability contradicts DFS flag"); | |
827 | ||
828 | tcon_exit: | |
829 | free_rsp_buf(resp_buftype, rsp); | |
830 | kfree(unc_path); | |
831 | return rc; | |
832 | ||
833 | tcon_error_exit: | |
834 | if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) { | |
835 | cERROR(1, "BAD_NETWORK_NAME: %s", tree); | |
836 | tcon->bad_network_name = true; | |
837 | } | |
838 | goto tcon_exit; | |
839 | } | |
840 | ||
841 | int | |
842 | SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) | |
843 | { | |
844 | struct smb2_tree_disconnect_req *req; /* response is trivial */ | |
845 | int rc = 0; | |
846 | struct TCP_Server_Info *server; | |
847 | struct cifs_ses *ses = tcon->ses; | |
848 | ||
849 | cFYI(1, "Tree Disconnect"); | |
850 | ||
851 | if (ses && (ses->server)) | |
852 | server = ses->server; | |
853 | else | |
854 | return -EIO; | |
855 | ||
856 | if ((tcon->need_reconnect) || (tcon->ses->need_reconnect)) | |
857 | return 0; | |
858 | ||
859 | rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req); | |
860 | if (rc) | |
861 | return rc; | |
862 | ||
863 | rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0); | |
864 | if (rc) | |
865 | cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); | |
866 | ||
867 | return rc; | |
868 | } | |
2503a0db PS |
869 | |
870 | int | |
871 | SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path, | |
872 | u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access, | |
f0df737e PS |
873 | __u32 create_disposition, __u32 file_attributes, __u32 create_options, |
874 | struct smb2_file_all_info *buf) | |
2503a0db PS |
875 | { |
876 | struct smb2_create_req *req; | |
877 | struct smb2_create_rsp *rsp; | |
878 | struct TCP_Server_Info *server; | |
879 | struct cifs_ses *ses = tcon->ses; | |
880 | struct kvec iov[2]; | |
881 | int resp_buftype; | |
882 | int uni_path_len; | |
883 | int rc = 0; | |
884 | int num_iovecs = 2; | |
885 | ||
886 | cFYI(1, "create/open"); | |
887 | ||
888 | if (ses && (ses->server)) | |
889 | server = ses->server; | |
890 | else | |
891 | return -EIO; | |
892 | ||
893 | rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req); | |
894 | if (rc) | |
895 | return rc; | |
896 | ||
f0df737e | 897 | /* if (server->oplocks) |
2503a0db | 898 | req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_BATCH; |
f0df737e | 899 | else */ |
2503a0db PS |
900 | req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; |
901 | req->ImpersonationLevel = IL_IMPERSONATION; | |
902 | req->DesiredAccess = cpu_to_le32(desired_access); | |
903 | /* File attributes ignored on open (used in create though) */ | |
904 | req->FileAttributes = cpu_to_le32(file_attributes); | |
905 | req->ShareAccess = FILE_SHARE_ALL_LE; | |
906 | req->CreateDisposition = cpu_to_le32(create_disposition); | |
907 | req->CreateOptions = cpu_to_le32(create_options); | |
908 | uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; | |
909 | req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) | |
910 | - 1 /* pad */ - 4 /* do not count rfc1001 len field */); | |
911 | ||
912 | iov[0].iov_base = (char *)req; | |
913 | /* 4 for rfc1002 length field */ | |
914 | iov[0].iov_len = get_rfc1002_length(req) + 4; | |
915 | ||
916 | /* MUST set path len (NameLength) to 0 opening root of share */ | |
917 | if (uni_path_len >= 4) { | |
918 | req->NameLength = cpu_to_le16(uni_path_len - 2); | |
919 | /* -1 since last byte is buf[0] which is sent below (path) */ | |
920 | iov[0].iov_len--; | |
921 | iov[1].iov_len = uni_path_len; | |
922 | iov[1].iov_base = path; | |
923 | /* | |
924 | * -1 since last byte is buf[0] which was counted in | |
925 | * smb2_buf_len. | |
926 | */ | |
927 | inc_rfc1001_len(req, uni_path_len - 1); | |
928 | } else { | |
929 | num_iovecs = 1; | |
930 | req->NameLength = 0; | |
931 | } | |
932 | ||
933 | rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0); | |
934 | rsp = (struct smb2_create_rsp *)iov[0].iov_base; | |
935 | ||
936 | if (rc != 0) { | |
937 | cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); | |
938 | goto creat_exit; | |
939 | } | |
940 | ||
941 | if (rsp == NULL) { | |
942 | rc = -EIO; | |
943 | goto creat_exit; | |
944 | } | |
945 | *persistent_fid = rsp->PersistentFileId; | |
946 | *volatile_fid = rsp->VolatileFileId; | |
f0df737e PS |
947 | |
948 | if (buf) { | |
949 | memcpy(buf, &rsp->CreationTime, 32); | |
950 | buf->AllocationSize = rsp->AllocationSize; | |
951 | buf->EndOfFile = rsp->EndofFile; | |
952 | buf->Attributes = rsp->FileAttributes; | |
953 | buf->NumberOfLinks = cpu_to_le32(1); | |
954 | buf->DeletePending = 0; | |
955 | } | |
2503a0db PS |
956 | creat_exit: |
957 | free_rsp_buf(resp_buftype, rsp); | |
958 | return rc; | |
959 | } | |
960 | ||
961 | int | |
962 | SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, | |
963 | u64 persistent_fid, u64 volatile_fid) | |
964 | { | |
965 | struct smb2_close_req *req; | |
966 | struct smb2_close_rsp *rsp; | |
967 | struct TCP_Server_Info *server; | |
968 | struct cifs_ses *ses = tcon->ses; | |
969 | struct kvec iov[1]; | |
970 | int resp_buftype; | |
971 | int rc = 0; | |
972 | ||
973 | cFYI(1, "Close"); | |
974 | ||
975 | if (ses && (ses->server)) | |
976 | server = ses->server; | |
977 | else | |
978 | return -EIO; | |
979 | ||
980 | rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req); | |
981 | if (rc) | |
982 | return rc; | |
983 | ||
984 | req->PersistentFileId = persistent_fid; | |
985 | req->VolatileFileId = volatile_fid; | |
986 | ||
987 | iov[0].iov_base = (char *)req; | |
988 | /* 4 for rfc1002 length field */ | |
989 | iov[0].iov_len = get_rfc1002_length(req) + 4; | |
990 | ||
991 | rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); | |
992 | rsp = (struct smb2_close_rsp *)iov[0].iov_base; | |
993 | ||
994 | if (rc != 0) { | |
995 | if (tcon) | |
996 | cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); | |
997 | goto close_exit; | |
998 | } | |
999 | ||
1000 | if (rsp == NULL) { | |
1001 | rc = -EIO; | |
1002 | goto close_exit; | |
1003 | } | |
1004 | ||
1005 | /* BB FIXME - decode close response, update inode for caching */ | |
1006 | ||
1007 | close_exit: | |
1008 | free_rsp_buf(resp_buftype, rsp); | |
1009 | return rc; | |
1010 | } | |
be4cb9e3 PS |
1011 | |
1012 | static int | |
1013 | validate_buf(unsigned int offset, unsigned int buffer_length, | |
1014 | struct smb2_hdr *hdr, unsigned int min_buf_size) | |
1015 | ||
1016 | { | |
1017 | unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length); | |
1018 | char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr; | |
1019 | char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr; | |
1020 | char *end_of_buf = begin_of_buf + buffer_length; | |
1021 | ||
1022 | ||
1023 | if (buffer_length < min_buf_size) { | |
1024 | cERROR(1, "buffer length %d smaller than minimum size %d", | |
1025 | buffer_length, min_buf_size); | |
1026 | return -EINVAL; | |
1027 | } | |
1028 | ||
1029 | /* check if beyond RFC1001 maximum length */ | |
1030 | if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { | |
1031 | cERROR(1, "buffer length %d or smb length %d too large", | |
1032 | buffer_length, smb_len); | |
1033 | return -EINVAL; | |
1034 | } | |
1035 | ||
1036 | if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { | |
1037 | cERROR(1, "illegal server response, bad offset to data"); | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * If SMB buffer fields are valid, copy into temporary buffer to hold result. | |
1046 | * Caller must free buffer. | |
1047 | */ | |
1048 | static int | |
1049 | validate_and_copy_buf(unsigned int offset, unsigned int buffer_length, | |
1050 | struct smb2_hdr *hdr, unsigned int minbufsize, | |
1051 | char *data) | |
1052 | ||
1053 | { | |
1054 | char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr; | |
1055 | int rc; | |
1056 | ||
1057 | if (!data) | |
1058 | return -EINVAL; | |
1059 | ||
1060 | rc = validate_buf(offset, buffer_length, hdr, minbufsize); | |
1061 | if (rc) | |
1062 | return rc; | |
1063 | ||
1064 | memcpy(data, begin_of_buf, buffer_length); | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
f0df737e PS |
1069 | static int |
1070 | query_info(const unsigned int xid, struct cifs_tcon *tcon, | |
1071 | u64 persistent_fid, u64 volatile_fid, u8 info_class, | |
1072 | size_t output_len, size_t min_len, void *data) | |
be4cb9e3 PS |
1073 | { |
1074 | struct smb2_query_info_req *req; | |
1075 | struct smb2_query_info_rsp *rsp = NULL; | |
1076 | struct kvec iov[2]; | |
1077 | int rc = 0; | |
1078 | int resp_buftype; | |
1079 | struct TCP_Server_Info *server; | |
1080 | struct cifs_ses *ses = tcon->ses; | |
1081 | ||
1082 | cFYI(1, "Query Info"); | |
1083 | ||
1084 | if (ses && (ses->server)) | |
1085 | server = ses->server; | |
1086 | else | |
1087 | return -EIO; | |
1088 | ||
1089 | rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req); | |
1090 | if (rc) | |
1091 | return rc; | |
1092 | ||
1093 | req->InfoType = SMB2_O_INFO_FILE; | |
f0df737e | 1094 | req->FileInfoClass = info_class; |
be4cb9e3 PS |
1095 | req->PersistentFileId = persistent_fid; |
1096 | req->VolatileFileId = volatile_fid; | |
1097 | /* 4 for rfc1002 length field and 1 for Buffer */ | |
1098 | req->InputBufferOffset = | |
1099 | cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4); | |
f0df737e | 1100 | req->OutputBufferLength = cpu_to_le32(output_len); |
be4cb9e3 PS |
1101 | |
1102 | iov[0].iov_base = (char *)req; | |
1103 | /* 4 for rfc1002 length field */ | |
1104 | iov[0].iov_len = get_rfc1002_length(req) + 4; | |
1105 | ||
1106 | rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); | |
1107 | if (rc) { | |
1108 | cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); | |
1109 | goto qinf_exit; | |
1110 | } | |
1111 | ||
1112 | rsp = (struct smb2_query_info_rsp *)iov[0].iov_base; | |
1113 | ||
1114 | rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset), | |
1115 | le32_to_cpu(rsp->OutputBufferLength), | |
f0df737e | 1116 | &rsp->hdr, min_len, data); |
be4cb9e3 PS |
1117 | |
1118 | qinf_exit: | |
1119 | free_rsp_buf(resp_buftype, rsp); | |
1120 | return rc; | |
1121 | } | |
9094fad1 | 1122 | |
f0df737e PS |
1123 | int |
1124 | SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, | |
1125 | u64 persistent_fid, u64 volatile_fid, | |
1126 | struct smb2_file_all_info *data) | |
1127 | { | |
1128 | return query_info(xid, tcon, persistent_fid, volatile_fid, | |
1129 | FILE_ALL_INFORMATION, | |
1130 | sizeof(struct smb2_file_all_info) + MAX_NAME * 2, | |
1131 | sizeof(struct smb2_file_all_info), data); | |
1132 | } | |
1133 | ||
1134 | int | |
1135 | SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, | |
1136 | u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) | |
1137 | { | |
1138 | return query_info(xid, tcon, persistent_fid, volatile_fid, | |
1139 | FILE_INTERNAL_INFORMATION, | |
1140 | sizeof(struct smb2_file_internal_info), | |
1141 | sizeof(struct smb2_file_internal_info), uniqueid); | |
1142 | } | |
1143 | ||
9094fad1 PS |
1144 | /* |
1145 | * This is a no-op for now. We're not really interested in the reply, but | |
1146 | * rather in the fact that the server sent one and that server->lstrp | |
1147 | * gets updated. | |
1148 | * | |
1149 | * FIXME: maybe we should consider checking that the reply matches request? | |
1150 | */ | |
1151 | static void | |
1152 | smb2_echo_callback(struct mid_q_entry *mid) | |
1153 | { | |
1154 | struct TCP_Server_Info *server = mid->callback_data; | |
1155 | struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf; | |
1156 | unsigned int credits_received = 1; | |
1157 | ||
1158 | if (mid->mid_state == MID_RESPONSE_RECEIVED) | |
1159 | credits_received = le16_to_cpu(smb2->hdr.CreditRequest); | |
1160 | ||
1161 | DeleteMidQEntry(mid); | |
1162 | add_credits(server, credits_received, CIFS_ECHO_OP); | |
1163 | } | |
1164 | ||
1165 | int | |
1166 | SMB2_echo(struct TCP_Server_Info *server) | |
1167 | { | |
1168 | struct smb2_echo_req *req; | |
1169 | int rc = 0; | |
1170 | struct kvec iov; | |
1171 | ||
1172 | cFYI(1, "In echo request"); | |
1173 | ||
1174 | rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req); | |
1175 | if (rc) | |
1176 | return rc; | |
1177 | ||
1178 | req->hdr.CreditRequest = cpu_to_le16(1); | |
1179 | ||
1180 | iov.iov_base = (char *)req; | |
1181 | /* 4 for rfc1002 length field */ | |
1182 | iov.iov_len = get_rfc1002_length(req) + 4; | |
1183 | ||
1184 | rc = cifs_call_async(server, &iov, 1, NULL, smb2_echo_callback, server, | |
1185 | CIFS_ECHO_OP); | |
1186 | if (rc) | |
1187 | cFYI(1, "Echo request failed: %d", rc); | |
1188 | ||
1189 | cifs_small_buf_release(req); | |
1190 | return rc; | |
1191 | } | |
7a5cfb19 PS |
1192 | |
1193 | int | |
1194 | SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, | |
1195 | u64 volatile_fid) | |
1196 | { | |
1197 | struct smb2_flush_req *req; | |
1198 | struct TCP_Server_Info *server; | |
1199 | struct cifs_ses *ses = tcon->ses; | |
1200 | struct kvec iov[1]; | |
1201 | int resp_buftype; | |
1202 | int rc = 0; | |
1203 | ||
1204 | cFYI(1, "Flush"); | |
1205 | ||
1206 | if (ses && (ses->server)) | |
1207 | server = ses->server; | |
1208 | else | |
1209 | return -EIO; | |
1210 | ||
1211 | rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req); | |
1212 | if (rc) | |
1213 | return rc; | |
1214 | ||
1215 | req->PersistentFileId = persistent_fid; | |
1216 | req->VolatileFileId = volatile_fid; | |
1217 | ||
1218 | iov[0].iov_base = (char *)req; | |
1219 | /* 4 for rfc1002 length field */ | |
1220 | iov[0].iov_len = get_rfc1002_length(req) + 4; | |
1221 | ||
1222 | rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0); | |
1223 | ||
1224 | if ((rc != 0) && tcon) | |
1225 | cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); | |
1226 | ||
1227 | free_rsp_buf(resp_buftype, iov[0].iov_base); | |
1228 | return rc; | |
1229 | } | |
09a4707e PS |
1230 | |
1231 | /* | |
1232 | * To form a chain of read requests, any read requests after the first should | |
1233 | * have the end_of_chain boolean set to true. | |
1234 | */ | |
1235 | static int | |
1236 | smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms, | |
1237 | unsigned int remaining_bytes, int request_type) | |
1238 | { | |
1239 | int rc = -EACCES; | |
1240 | struct smb2_read_req *req = NULL; | |
1241 | ||
1242 | rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req); | |
1243 | if (rc) | |
1244 | return rc; | |
1245 | if (io_parms->tcon->ses->server == NULL) | |
1246 | return -ECONNABORTED; | |
1247 | ||
1248 | req->hdr.ProcessId = cpu_to_le32(io_parms->pid); | |
1249 | ||
1250 | req->PersistentFileId = io_parms->persistent_fid; | |
1251 | req->VolatileFileId = io_parms->volatile_fid; | |
1252 | req->ReadChannelInfoOffset = 0; /* reserved */ | |
1253 | req->ReadChannelInfoLength = 0; /* reserved */ | |
1254 | req->Channel = 0; /* reserved */ | |
1255 | req->MinimumCount = 0; | |
1256 | req->Length = cpu_to_le32(io_parms->length); | |
1257 | req->Offset = cpu_to_le64(io_parms->offset); | |
1258 | ||
1259 | if (request_type & CHAINED_REQUEST) { | |
1260 | if (!(request_type & END_OF_CHAIN)) { | |
1261 | /* 4 for rfc1002 length field */ | |
1262 | req->hdr.NextCommand = | |
1263 | cpu_to_le32(get_rfc1002_length(req) + 4); | |
1264 | } else /* END_OF_CHAIN */ | |
1265 | req->hdr.NextCommand = 0; | |
1266 | if (request_type & RELATED_REQUEST) { | |
1267 | req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS; | |
1268 | /* | |
1269 | * Related requests use info from previous read request | |
1270 | * in chain. | |
1271 | */ | |
1272 | req->hdr.SessionId = 0xFFFFFFFF; | |
1273 | req->hdr.TreeId = 0xFFFFFFFF; | |
1274 | req->PersistentFileId = 0xFFFFFFFF; | |
1275 | req->VolatileFileId = 0xFFFFFFFF; | |
1276 | } | |
1277 | } | |
1278 | if (remaining_bytes > io_parms->length) | |
1279 | req->RemainingBytes = cpu_to_le32(remaining_bytes); | |
1280 | else | |
1281 | req->RemainingBytes = 0; | |
1282 | ||
1283 | iov[0].iov_base = (char *)req; | |
1284 | /* 4 for rfc1002 length field */ | |
1285 | iov[0].iov_len = get_rfc1002_length(req) + 4; | |
1286 | return rc; | |
1287 | } | |
1288 | ||
1289 | static void | |
1290 | smb2_readv_callback(struct mid_q_entry *mid) | |
1291 | { | |
1292 | struct cifs_readdata *rdata = mid->callback_data; | |
1293 | struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); | |
1294 | struct TCP_Server_Info *server = tcon->ses->server; | |
1295 | struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov[0].iov_base; | |
1296 | unsigned int credits_received = 1; | |
1297 | ||
1298 | cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__, | |
1299 | mid->mid, mid->mid_state, rdata->result, rdata->bytes); | |
1300 | ||
1301 | switch (mid->mid_state) { | |
1302 | case MID_RESPONSE_RECEIVED: | |
1303 | credits_received = le16_to_cpu(buf->CreditRequest); | |
1304 | /* result already set, check signature */ | |
3c1bf7e4 PS |
1305 | if (server->sec_mode & |
1306 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1307 | int rc; | |
1308 | ||
1309 | rc = smb2_verify_signature2(rdata->iov, rdata->nr_iov, | |
1310 | server); | |
1311 | if (rc) | |
1312 | cERROR(1, "SMB signature verification returned " | |
1313 | "error = %d", rc); | |
1314 | } | |
09a4707e PS |
1315 | /* FIXME: should this be counted toward the initiating task? */ |
1316 | task_io_account_read(rdata->bytes); | |
1317 | cifs_stats_bytes_read(tcon, rdata->bytes); | |
1318 | break; | |
1319 | case MID_REQUEST_SUBMITTED: | |
1320 | case MID_RETRY_NEEDED: | |
1321 | rdata->result = -EAGAIN; | |
1322 | break; | |
1323 | default: | |
1324 | if (rdata->result != -ENODATA) | |
1325 | rdata->result = -EIO; | |
1326 | } | |
1327 | ||
1328 | if (rdata->result) | |
1329 | cifs_stats_fail_inc(tcon, SMB2_READ_HE); | |
1330 | ||
1331 | queue_work(cifsiod_wq, &rdata->work); | |
1332 | DeleteMidQEntry(mid); | |
1333 | add_credits(server, credits_received, 0); | |
1334 | } | |
1335 | ||
1336 | /* smb2_async_readv - send an async write, and set up mid to handle result */ | |
1337 | int | |
1338 | smb2_async_readv(struct cifs_readdata *rdata) | |
1339 | { | |
1340 | int rc; | |
1341 | struct smb2_hdr *buf; | |
1342 | struct cifs_io_parms io_parms; | |
1343 | ||
1344 | cFYI(1, "%s: offset=%llu bytes=%u", __func__, | |
1345 | rdata->offset, rdata->bytes); | |
1346 | ||
1347 | io_parms.tcon = tlink_tcon(rdata->cfile->tlink); | |
1348 | io_parms.offset = rdata->offset; | |
1349 | io_parms.length = rdata->bytes; | |
1350 | io_parms.persistent_fid = rdata->cfile->fid.persistent_fid; | |
1351 | io_parms.volatile_fid = rdata->cfile->fid.volatile_fid; | |
1352 | io_parms.pid = rdata->pid; | |
1353 | rc = smb2_new_read_req(&rdata->iov[0], &io_parms, 0, 0); | |
1354 | if (rc) | |
1355 | return rc; | |
1356 | ||
1357 | buf = (struct smb2_hdr *)rdata->iov[0].iov_base; | |
1358 | /* 4 for rfc1002 length field */ | |
1359 | rdata->iov[0].iov_len = get_rfc1002_length(rdata->iov[0].iov_base) + 4; | |
1360 | ||
1361 | kref_get(&rdata->refcount); | |
1362 | rc = cifs_call_async(io_parms.tcon->ses->server, rdata->iov, 1, | |
1363 | cifs_readv_receive, smb2_readv_callback, | |
1364 | rdata, 0); | |
1365 | if (rc) | |
1366 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1367 | ||
1368 | cifs_small_buf_release(buf); | |
1369 | return rc; | |
1370 | } | |
33319141 | 1371 | |
d8e05039 PS |
1372 | int |
1373 | SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, | |
1374 | unsigned int *nbytes, char **buf, int *buf_type) | |
1375 | { | |
1376 | int resp_buftype, rc = -EACCES; | |
1377 | struct smb2_read_rsp *rsp = NULL; | |
1378 | struct kvec iov[1]; | |
1379 | ||
1380 | *nbytes = 0; | |
1381 | rc = smb2_new_read_req(iov, io_parms, 0, 0); | |
1382 | if (rc) | |
1383 | return rc; | |
1384 | ||
1385 | rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1, | |
1386 | &resp_buftype, CIFS_LOG_ERROR); | |
1387 | ||
1388 | rsp = (struct smb2_read_rsp *)iov[0].iov_base; | |
1389 | ||
1390 | if (rsp->hdr.Status == STATUS_END_OF_FILE) { | |
1391 | free_rsp_buf(resp_buftype, iov[0].iov_base); | |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | if (rc) { | |
1396 | cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); | |
1397 | cERROR(1, "Send error in read = %d", rc); | |
1398 | } else { | |
1399 | *nbytes = le32_to_cpu(rsp->DataLength); | |
1400 | if ((*nbytes > CIFS_MAX_MSGSIZE) || | |
1401 | (*nbytes > io_parms->length)) { | |
1402 | cFYI(1, "bad length %d for count %d", *nbytes, | |
1403 | io_parms->length); | |
1404 | rc = -EIO; | |
1405 | *nbytes = 0; | |
1406 | } | |
1407 | } | |
1408 | ||
1409 | if (*buf) { | |
1410 | memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset, | |
1411 | *nbytes); | |
1412 | free_rsp_buf(resp_buftype, iov[0].iov_base); | |
1413 | } else if (resp_buftype != CIFS_NO_BUFFER) { | |
1414 | *buf = iov[0].iov_base; | |
1415 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
1416 | *buf_type = CIFS_SMALL_BUFFER; | |
1417 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
1418 | *buf_type = CIFS_LARGE_BUFFER; | |
1419 | } | |
1420 | return rc; | |
1421 | } | |
1422 | ||
33319141 PS |
1423 | /* |
1424 | * Check the mid_state and signature on received buffer (if any), and queue the | |
1425 | * workqueue completion task. | |
1426 | */ | |
1427 | static void | |
1428 | smb2_writev_callback(struct mid_q_entry *mid) | |
1429 | { | |
1430 | struct cifs_writedata *wdata = mid->callback_data; | |
1431 | struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); | |
1432 | unsigned int written; | |
1433 | struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; | |
1434 | unsigned int credits_received = 1; | |
1435 | ||
1436 | switch (mid->mid_state) { | |
1437 | case MID_RESPONSE_RECEIVED: | |
1438 | credits_received = le16_to_cpu(rsp->hdr.CreditRequest); | |
1439 | wdata->result = smb2_check_receive(mid, tcon->ses->server, 0); | |
1440 | if (wdata->result != 0) | |
1441 | break; | |
1442 | ||
1443 | written = le32_to_cpu(rsp->DataLength); | |
1444 | /* | |
1445 | * Mask off high 16 bits when bytes written as returned | |
1446 | * by the server is greater than bytes requested by the | |
1447 | * client. OS/2 servers are known to set incorrect | |
1448 | * CountHigh values. | |
1449 | */ | |
1450 | if (written > wdata->bytes) | |
1451 | written &= 0xFFFF; | |
1452 | ||
1453 | if (written < wdata->bytes) | |
1454 | wdata->result = -ENOSPC; | |
1455 | else | |
1456 | wdata->bytes = written; | |
1457 | break; | |
1458 | case MID_REQUEST_SUBMITTED: | |
1459 | case MID_RETRY_NEEDED: | |
1460 | wdata->result = -EAGAIN; | |
1461 | break; | |
1462 | default: | |
1463 | wdata->result = -EIO; | |
1464 | break; | |
1465 | } | |
1466 | ||
1467 | if (wdata->result) | |
1468 | cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); | |
1469 | ||
1470 | queue_work(cifsiod_wq, &wdata->work); | |
1471 | DeleteMidQEntry(mid); | |
1472 | add_credits(tcon->ses->server, credits_received, 0); | |
1473 | } | |
1474 | ||
1475 | /* smb2_async_writev - send an async write, and set up mid to handle result */ | |
1476 | int | |
1477 | smb2_async_writev(struct cifs_writedata *wdata) | |
1478 | { | |
1479 | int i, rc = -EACCES; | |
1480 | struct smb2_write_req *req = NULL; | |
1481 | struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); | |
1482 | struct kvec *iov = NULL; | |
1483 | ||
1484 | rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req); | |
1485 | if (rc) | |
1486 | goto async_writev_out; | |
1487 | ||
1488 | /* 1 iov per page + 1 for header */ | |
1489 | iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS); | |
1490 | if (iov == NULL) { | |
1491 | rc = -ENOMEM; | |
1492 | goto async_writev_out; | |
1493 | } | |
1494 | ||
1495 | req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid); | |
1496 | ||
1497 | req->PersistentFileId = wdata->cfile->fid.persistent_fid; | |
1498 | req->VolatileFileId = wdata->cfile->fid.volatile_fid; | |
1499 | req->WriteChannelInfoOffset = 0; | |
1500 | req->WriteChannelInfoLength = 0; | |
1501 | req->Channel = 0; | |
1502 | req->Offset = cpu_to_le64(wdata->offset); | |
1503 | /* 4 for rfc1002 length field */ | |
1504 | req->DataOffset = cpu_to_le16( | |
1505 | offsetof(struct smb2_write_req, Buffer) - 4); | |
1506 | req->RemainingBytes = 0; | |
1507 | ||
1508 | /* 4 for rfc1002 length field and 1 for Buffer */ | |
1509 | iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; | |
1510 | iov[0].iov_base = (char *)req; | |
1511 | ||
1512 | /* | |
1513 | * This function should marshal up the page array into the kvec | |
1514 | * array, reserving [0] for the header. It should kmap the pages | |
1515 | * and set the iov_len properly for each one. It may also set | |
1516 | * wdata->bytes too. | |
1517 | */ | |
1518 | cifs_kmap_lock(); | |
1519 | wdata->marshal_iov(iov, wdata); | |
1520 | cifs_kmap_unlock(); | |
1521 | ||
1522 | cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes); | |
1523 | ||
1524 | req->Length = cpu_to_le32(wdata->bytes); | |
1525 | ||
1526 | inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */); | |
1527 | ||
1528 | kref_get(&wdata->refcount); | |
1529 | rc = cifs_call_async(tcon->ses->server, iov, wdata->nr_pages + 1, | |
1530 | NULL, smb2_writev_callback, wdata, 0); | |
1531 | ||
1532 | if (rc) | |
1533 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1534 | ||
1535 | /* send is done, unmap pages */ | |
1536 | for (i = 0; i < wdata->nr_pages; i++) | |
1537 | kunmap(wdata->pages[i]); | |
1538 | ||
1539 | async_writev_out: | |
1540 | cifs_small_buf_release(req); | |
1541 | kfree(iov); | |
1542 | return rc; | |
1543 | } | |
009d3443 PS |
1544 | |
1545 | /* | |
1546 | * SMB2_write function gets iov pointer to kvec array with n_vec as a length. | |
1547 | * The length field from io_parms must be at least 1 and indicates a number of | |
1548 | * elements with data to write that begins with position 1 in iov array. All | |
1549 | * data length is specified by count. | |
1550 | */ | |
1551 | int | |
1552 | SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, | |
1553 | unsigned int *nbytes, struct kvec *iov, int n_vec) | |
1554 | { | |
1555 | int rc = 0; | |
1556 | struct smb2_write_req *req = NULL; | |
1557 | struct smb2_write_rsp *rsp = NULL; | |
1558 | int resp_buftype; | |
1559 | *nbytes = 0; | |
1560 | ||
1561 | if (n_vec < 1) | |
1562 | return rc; | |
1563 | ||
1564 | rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req); | |
1565 | if (rc) | |
1566 | return rc; | |
1567 | ||
1568 | if (io_parms->tcon->ses->server == NULL) | |
1569 | return -ECONNABORTED; | |
1570 | ||
1571 | req->hdr.ProcessId = cpu_to_le32(io_parms->pid); | |
1572 | ||
1573 | req->PersistentFileId = io_parms->persistent_fid; | |
1574 | req->VolatileFileId = io_parms->volatile_fid; | |
1575 | req->WriteChannelInfoOffset = 0; | |
1576 | req->WriteChannelInfoLength = 0; | |
1577 | req->Channel = 0; | |
1578 | req->Length = cpu_to_le32(io_parms->length); | |
1579 | req->Offset = cpu_to_le64(io_parms->offset); | |
1580 | /* 4 for rfc1002 length field */ | |
1581 | req->DataOffset = cpu_to_le16( | |
1582 | offsetof(struct smb2_write_req, Buffer) - 4); | |
1583 | req->RemainingBytes = 0; | |
1584 | ||
1585 | iov[0].iov_base = (char *)req; | |
1586 | /* 4 for rfc1002 length field and 1 for Buffer */ | |
1587 | iov[0].iov_len = get_rfc1002_length(req) + 4 - 1; | |
1588 | ||
1589 | /* length of entire message including data to be written */ | |
1590 | inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */); | |
1591 | ||
1592 | rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1, | |
1593 | &resp_buftype, 0); | |
1594 | ||
1595 | if (rc) { | |
1596 | cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); | |
1597 | cERROR(1, "Send error in write = %d", rc); | |
1598 | } else { | |
1599 | rsp = (struct smb2_write_rsp *)iov[0].iov_base; | |
1600 | *nbytes = le32_to_cpu(rsp->DataLength); | |
1601 | free_rsp_buf(resp_buftype, rsp); | |
1602 | } | |
1603 | return rc; | |
1604 | } |