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1 /*

2 * fs/cifs/misc.c

3 *

4 * Copyright (C) International Business Machines Corp., 2002,2008

5 * Author(s): Steve French (sfrench@us.ibm.com)

6 *

7 * This library is free software; you can redistribute it and/or modify

8 * it under the terms of the GNU Lesser General Public License as published

9 * by the Free Software Foundation; either version 2.1 of the License, or

10 * (at your option) any later version.

11 *

12 * This library is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See

15 * the GNU Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public License

18 * along with this library; if not, write to the Free Software

19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

20 */

21

22 #include <linux/slab.h>

23 #include <linux/ctype.h>

24 #include <linux/mempool.h>

25 #include "cifspdu.h"

26 #include "cifsglob.h"

27 #include "cifsproto.h"

28 #include "cifs_debug.h"

29 #include "smberr.h"

30 #include "nterr.h"

31 #include "cifs_unicode.h"

32

33 extern mempool_t *cifs_sm_req_poolp;

34 extern mempool_t *cifs_req_poolp;

35 extern struct task_struct *oplockThread;

36

37 /* The xid serves as a useful identifier for each incoming vfs request,

38 in a similar way to the mid which is useful to track each sent smb,

39 and CurrentXid can also provide a running counter (although it

40 will eventually wrap past zero) of the total vfs operations handled

41 since the cifs fs was mounted */

42

43 unsigned int

44 _GetXid(void)

45 {

46 unsigned int xid;

47

48 spin_lock(&GlobalMid_Lock);

49 GlobalTotalActiveXid++;

50

51 /* keep high water mark for number of simultaneous ops in filesystem */

52 if (GlobalTotalActiveXid > GlobalMaxActiveXid)

53 GlobalMaxActiveXid = GlobalTotalActiveXid;

54 if (GlobalTotalActiveXid > 65000)

55 cFYI(1, ("warning: more than 65000 requests active"));

56 xid = GlobalCurrentXid++;

57 spin_unlock(&GlobalMid_Lock);

58 return xid;

59 }

60

61 void

62 _FreeXid(unsigned int xid)

63 {

64 spin_lock(&GlobalMid_Lock);

65 /* if (GlobalTotalActiveXid == 0)

66 BUG(); */

67 GlobalTotalActiveXid--;

68 spin_unlock(&GlobalMid_Lock);

69 }

70

71 struct cifsSesInfo *

72 sesInfoAlloc(void)

73 {

74 struct cifsSesInfo *ret_buf;

75

76 ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL);

77 if (ret_buf) {

78 write_lock(&GlobalSMBSeslock);

79 atomic_inc(&sesInfoAllocCount);

80 ret_buf->status = CifsNew;

81 list_add(&ret_buf->cifsSessionList, &GlobalSMBSessionList);

82 init_MUTEX(&ret_buf->sesSem);

83 write_unlock(&GlobalSMBSeslock);

84 }

85 return ret_buf;

86 }

87

88 void

89 sesInfoFree(struct cifsSesInfo *buf_to_free)

90 {

91 if (buf_to_free == NULL) {

92 cFYI(1, ("Null buffer passed to sesInfoFree"));

93 return;

94 }

95

96 write_lock(&GlobalSMBSeslock);

97 atomic_dec(&sesInfoAllocCount);

98 list_del(&buf_to_free->cifsSessionList);

99 write_unlock(&GlobalSMBSeslock);

100 kfree(buf_to_free->serverOS);

101 kfree(buf_to_free->serverDomain);

102 kfree(buf_to_free->serverNOS);

103 kfree(buf_to_free->password);

104 kfree(buf_to_free->domainName);

105 kfree(buf_to_free);

106 }

107

108 struct cifsTconInfo *

109 tconInfoAlloc(void)

110 {

111 struct cifsTconInfo *ret_buf;

112 ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL);

113 if (ret_buf) {

114 write_lock(&GlobalSMBSeslock);

115 atomic_inc(&tconInfoAllocCount);

116 list_add(&ret_buf->cifsConnectionList,

117 &GlobalTreeConnectionList);

118 ret_buf->tidStatus = CifsNew;

119 INIT_LIST_HEAD(&ret_buf->openFileList);

120 init_MUTEX(&ret_buf->tconSem);

121 #ifdef CONFIG_CIFS_STATS

122 spin_lock_init(&ret_buf->stat_lock);

123 #endif

124 write_unlock(&GlobalSMBSeslock);

125 }

126 return ret_buf;

127 }

128

129 void

130 tconInfoFree(struct cifsTconInfo *buf_to_free)

131 {

132 if (buf_to_free == NULL) {

133 cFYI(1, ("Null buffer passed to tconInfoFree"));

134 return;

135 }

136 write_lock(&GlobalSMBSeslock);

137 atomic_dec(&tconInfoAllocCount);

138 list_del(&buf_to_free->cifsConnectionList);

139 write_unlock(&GlobalSMBSeslock);

140 kfree(buf_to_free->nativeFileSystem);

141 kfree(buf_to_free);

142 }

143

144 struct smb_hdr *

145 cifs_buf_get(void)

146 {

147 struct smb_hdr *ret_buf = NULL;

148

149 /* We could use negotiated size instead of max_msgsize -

150 but it may be more efficient to always alloc same size

151 albeit slightly larger than necessary and maxbuffersize

152 defaults to this and can not be bigger */

153 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);

154

155 /* clear the first few header bytes */

156 /* for most paths, more is cleared in header_assemble */

157 if (ret_buf) {

158 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);

159 atomic_inc(&bufAllocCount);

160 #ifdef CONFIG_CIFS_STATS2

161 atomic_inc(&totBufAllocCount);

162 #endif /* CONFIG_CIFS_STATS2 */

163 }

164

165 return ret_buf;

166 }

167

168 void

169 cifs_buf_release(void *buf_to_free)

170 {

171 if (buf_to_free == NULL) {

172 /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/

173 return;

174 }

175 mempool_free(buf_to_free, cifs_req_poolp);

176

177 atomic_dec(&bufAllocCount);

178 return;

179 }

180

181 struct smb_hdr *

182 cifs_small_buf_get(void)

183 {

184 struct smb_hdr *ret_buf = NULL;

185

186 /* We could use negotiated size instead of max_msgsize -

187 but it may be more efficient to always alloc same size

188 albeit slightly larger than necessary and maxbuffersize

189 defaults to this and can not be bigger */

190 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);

191 if (ret_buf) {

192 /* No need to clear memory here, cleared in header assemble */

193 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/

194 atomic_inc(&smBufAllocCount);

195 #ifdef CONFIG_CIFS_STATS2

196 atomic_inc(&totSmBufAllocCount);

197 #endif /* CONFIG_CIFS_STATS2 */

198

199 }

200 return ret_buf;

201 }

202

203 void

204 cifs_small_buf_release(void *buf_to_free)

205 {

206

207 if (buf_to_free == NULL) {

208 cFYI(1, ("Null buffer passed to cifs_small_buf_release"));

209 return;

210 }

211 mempool_free(buf_to_free, cifs_sm_req_poolp);

212

213 atomic_dec(&smBufAllocCount);

214 return;

215 }

216

217 /*

218 Find a free multiplex id (SMB mid). Otherwise there could be

219 mid collisions which might cause problems, demultiplexing the

220 wrong response to this request. Multiplex ids could collide if

221 one of a series requests takes much longer than the others, or

222 if a very large number of long lived requests (byte range

223 locks or FindNotify requests) are pending. No more than

224 64K-1 requests can be outstanding at one time. If no

225 mids are available, return zero. A future optimization

226 could make the combination of mids and uid the key we use

227 to demultiplex on (rather than mid alone).

228 In addition to the above check, the cifs demultiplex

229 code already used the command code as a secondary

230 check of the frame and if signing is negotiated the

231 response would be discarded if the mid were the same

232 but the signature was wrong. Since the mid is not put in the

233 pending queue until later (when it is about to be dispatched)

234 we do have to limit the number of outstanding requests

235 to somewhat less than 64K-1 although it is hard to imagine

236 so many threads being in the vfs at one time.

237 */

238 __u16 GetNextMid(struct TCP_Server_Info *server)

239 {

240 __u16 mid = 0;

241 __u16 last_mid;

242 int collision;

243

244 if (server == NULL)

245 return mid;

246

247 spin_lock(&GlobalMid_Lock);

248 last_mid = server->CurrentMid; /* we do not want to loop forever */

249 server->CurrentMid++;

250 /* This nested loop looks more expensive than it is.

251 In practice the list of pending requests is short,

252 fewer than 50, and the mids are likely to be unique

253 on the first pass through the loop unless some request

254 takes longer than the 64 thousand requests before it

255 (and it would also have to have been a request that

256 did not time out) */

257 while (server->CurrentMid != last_mid) {

258 struct list_head *tmp;

259 struct mid_q_entry *mid_entry;

260

261 collision = 0;

262 if (server->CurrentMid == 0)

263 server->CurrentMid++;

264

265 list_for_each(tmp, &server->pending_mid_q) {

266 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);

267

268 if ((mid_entry->mid == server->CurrentMid) &&

269 (mid_entry->midState == MID_REQUEST_SUBMITTED)) {

270 /* This mid is in use, try a different one */

271 collision = 1;

272 break;

273 }

274 }

275 if (collision == 0) {

276 mid = server->CurrentMid;

277 break;

278 }

279 server->CurrentMid++;

280 }

281 spin_unlock(&GlobalMid_Lock);

282 return mid;

283 }

284

285 /* NB: MID can not be set if treeCon not passed in, in that

286 case it is responsbility of caller to set the mid */

287 void

288 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,

289 const struct cifsTconInfo *treeCon, int word_count

290 /* length of fixed section (word count) in two byte units */)

291 {

292 struct list_head *temp_item;

293 struct cifsSesInfo *ses;

294 char *temp = (char *) buffer;

295

296 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */

297

298 buffer->smb_buf_length =

299 (2 * word_count) + sizeof(struct smb_hdr) -

300 4 /* RFC 1001 length field does not count */ +

301 2 /* for bcc field itself */ ;

302 /* Note that this is the only network field that has to be converted

303 to big endian and it is done just before we send it */

304

305 buffer->Protocol[0] = 0xFF;

306 buffer->Protocol[1] = 'S';

307 buffer->Protocol[2] = 'M';

308 buffer->Protocol[3] = 'B';

309 buffer->Command = smb_command;

310 buffer->Flags = 0x00; /* case sensitive */

311 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;

312 buffer->Pid = cpu_to_le16((__u16)current->tgid);

313 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));

314 if (treeCon) {

315 buffer->Tid = treeCon->tid;

316 if (treeCon->ses) {

317 if (treeCon->ses->capabilities & CAP_UNICODE)

318 buffer->Flags2 |= SMBFLG2_UNICODE;

319 if (treeCon->ses->capabilities & CAP_STATUS32)

320 buffer->Flags2 |= SMBFLG2_ERR_STATUS;

321

322 /* Uid is not converted */

323 buffer->Uid = treeCon->ses->Suid;

324 buffer->Mid = GetNextMid(treeCon->ses->server);

325 if (multiuser_mount != 0) {

326 /* For the multiuser case, there are few obvious technically */

327 /* possible mechanisms to match the local linux user (uid) */

328 /* to a valid remote smb user (smb_uid): */

329 /* 1) Query Winbind (or other local pam/nss daemon */

330 /* for userid/password/logon_domain or credential */

331 /* 2) Query Winbind for uid to sid to username mapping */

332 /* and see if we have a matching password for existing*/

333 /* session for that user perhas getting password by */

334 /* adding a new pam_cifs module that stores passwords */

335 /* so that the cifs vfs can get at that for all logged*/

336 /* on users */

337 /* 3) (Which is the mechanism we have chosen) */

338 /* Search through sessions to the same server for a */

339 /* a match on the uid that was passed in on mount */

340 /* with the current processes uid (or euid?) and use */

341 /* that smb uid. If no existing smb session for */

342 /* that uid found, use the default smb session ie */

343 /* the smb session for the volume mounted which is */

344 /* the same as would be used if the multiuser mount */

345 /* flag were disabled. */

346

347 /* BB Add support for establishing new tCon and SMB Session */

348 /* with userid/password pairs found on the smb session */

349 /* for other target tcp/ip addresses BB */

350 if (current_fsuid() != treeCon->ses->linux_uid) {

351 cFYI(1, ("Multiuser mode and UID "

352 "did not match tcon uid"));

353 read_lock(&GlobalSMBSeslock);

354 list_for_each(temp_item, &GlobalSMBSessionList) {

355 ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);

356 if (ses->linux_uid == current_fsuid()) {

357 if (ses->server == treeCon->ses->server) {

358 cFYI(1, ("found matching uid substitute right smb_uid"));

359 buffer->Uid = ses->Suid;

360 break;

361 } else {

362 /* BB eventually call cifs_setup_session here */

363 cFYI(1, ("local UID found but no smb sess with this server exists"));

364 }

365 }

366 }

367 read_unlock(&GlobalSMBSeslock);

368 }

369 }

370 }

371 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)

372 buffer->Flags2 |= SMBFLG2_DFS;

373 if (treeCon->nocase)

374 buffer->Flags |= SMBFLG_CASELESS;

375 if ((treeCon->ses) && (treeCon->ses->server))

376 if (treeCon->ses->server->secMode &

377 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))

378 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

379 }

380

381 /* endian conversion of flags is now done just before sending */

382 buffer->WordCount = (char) word_count;

383 return;

384 }

385

386 static int

387 checkSMBhdr(struct smb_hdr *smb, __u16 mid)

388 {

389 /* Make sure that this really is an SMB, that it is a response,

390 and that the message ids match */

391 if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&

392 (mid == smb->Mid)) {

393 if (smb->Flags & SMBFLG_RESPONSE)

394 return 0;

395 else {

396 /* only one valid case where server sends us request */

397 if (smb->Command == SMB_COM_LOCKING_ANDX)

398 return 0;

399 else

400 cERROR(1, ("Received Request not response"));

401 }

402 } else { /* bad signature or mid */

403 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))

404 cERROR(1,

405 ("Bad protocol string signature header %x",

406 *(unsigned int *) smb->Protocol));

407 if (mid != smb->Mid)

408 cERROR(1, ("Mids do not match"));

409 }

410 cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));

411 return 1;

412 }

413

414 int

415 checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)

416 {

417 __u32 len = smb->smb_buf_length;

418 __u32 clc_len; /* calculated length */

419 cFYI(0, ("checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len));

420

421 if (length < 2 + sizeof(struct smb_hdr)) {

422 if ((length >= sizeof(struct smb_hdr) - 1)

423 && (smb->Status.CifsError != 0)) {

424 smb->WordCount = 0;

425 /* some error cases do not return wct and bcc */

426 return 0;

427 } else if ((length == sizeof(struct smb_hdr) + 1) &&

428 (smb->WordCount == 0)) {

429 char *tmp = (char *)smb;

430 /* Need to work around a bug in two servers here */

431 /* First, check if the part of bcc they sent was zero */

432 if (tmp[sizeof(struct smb_hdr)] == 0) {

433 /* some servers return only half of bcc

434 * on simple responses (wct, bcc both zero)

435 * in particular have seen this on

436 * ulogoffX and FindClose. This leaves

437 * one byte of bcc potentially unitialized

438 */

439 /* zero rest of bcc */

440 tmp[sizeof(struct smb_hdr)+1] = 0;

441 return 0;

442 }

443 cERROR(1, ("rcvd invalid byte count (bcc)"));

444 } else {

445 cERROR(1, ("Length less than smb header size"));

446 }

447 return 1;

448 }

449 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {

450 cERROR(1, ("smb length greater than MaxBufSize, mid=%d",

451 smb->Mid));

452 return 1;

453 }

454

455 if (checkSMBhdr(smb, mid))

456 return 1;

457 clc_len = smbCalcSize_LE(smb);

458

459 if (4 + len != length) {

460 cERROR(1, ("Length read does not match RFC1001 length %d",

461 len));

462 return 1;

463 }

464

465 if (4 + len != clc_len) {

466 /* check if bcc wrapped around for large read responses */

467 if ((len > 64 * 1024) && (len > clc_len)) {

468 /* check if lengths match mod 64K */

469 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF))

470 return 0; /* bcc wrapped */

471 }

472 cFYI(1, ("Calculated size %d vs length %d mismatch for mid %d",

473 clc_len, 4 + len, smb->Mid));

474 /* Windows XP can return a few bytes too much, presumably

475 an illegal pad, at the end of byte range lock responses

476 so we allow for that three byte pad, as long as actual

477 received length is as long or longer than calculated length */

478 /* We have now had to extend this more, since there is a

479 case in which it needs to be bigger still to handle a

480 malformed response to transact2 findfirst from WinXP when

481 access denied is returned and thus bcc and wct are zero

482 but server says length is 0x21 bytes too long as if the server

483 forget to reset the smb rfc1001 length when it reset the

484 wct and bcc to minimum size and drop the t2 parms and data */

485 if ((4+len > clc_len) && (len <= clc_len + 512))

486 return 0;

487 else {

488 cERROR(1, ("RFC1001 size %d bigger than SMB for Mid=%d",

489 len, smb->Mid));

490 return 1;

491 }

492 }

493 return 0;

494 }

495

496 bool

497 is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)

498 {

499 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;

500 struct list_head *tmp;

501 struct list_head *tmp1;

502 struct cifsTconInfo *tcon;

503 struct cifsFileInfo *netfile;

504

505 cFYI(1, ("Checking for oplock break or dnotify response"));

506 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&

507 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {

508 struct smb_com_transaction_change_notify_rsp *pSMBr =

509 (struct smb_com_transaction_change_notify_rsp *)buf;

510 struct file_notify_information *pnotify;

511 __u32 data_offset = 0;

512 if (pSMBr->ByteCount > sizeof(struct file_notify_information)) {

513 data_offset = le32_to_cpu(pSMBr->DataOffset);

514

515 pnotify = (struct file_notify_information *)

516 ((char *)&pSMBr->hdr.Protocol + data_offset);

517 cFYI(1, ("dnotify on %s Action: 0x%x",

518 pnotify->FileName, pnotify->Action));

519 /* cifs_dump_mem("Rcvd notify Data: ",buf,

520 sizeof(struct smb_hdr)+60); */

521 return true;

522 }

523 if (pSMBr->hdr.Status.CifsError) {

524 cFYI(1, ("notify err 0x%d",

525 pSMBr->hdr.Status.CifsError));

526 return true;

527 }

528 return false;

529 }

530 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)

531 return false;

532 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {

533 /* no sense logging error on invalid handle on oplock

534 break - harmless race between close request and oplock

535 break response is expected from time to time writing out

536 large dirty files cached on the client */

537 if ((NT_STATUS_INVALID_HANDLE) ==

538 le32_to_cpu(pSMB->hdr.Status.CifsError)) {

539 cFYI(1, ("invalid handle on oplock break"));

540 return true;

541 } else if (ERRbadfid ==

542 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {

543 return true;

544 } else {

545 return false; /* on valid oplock brk we get "request" */

546 }

547 }

548 if (pSMB->hdr.WordCount != 8)

549 return false;

550

551 cFYI(1, ("oplock type 0x%d level 0x%d",

552 pSMB->LockType, pSMB->OplockLevel));

553 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))

554 return false;

555

556 /* look up tcon based on tid & uid */

557 read_lock(&GlobalSMBSeslock);

558 list_for_each(tmp, &GlobalTreeConnectionList) {

559 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);

560 if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) {

561 cifs_stats_inc(&tcon->num_oplock_brks);

562 list_for_each(tmp1, &tcon->openFileList) {

563 netfile = list_entry(tmp1, struct cifsFileInfo,

564 tlist);

565 if (pSMB->Fid == netfile->netfid) {

566 struct cifsInodeInfo *pCifsInode;

567 read_unlock(&GlobalSMBSeslock);

568 cFYI(1,

569 ("file id match, oplock break"));

570 pCifsInode =

571 CIFS_I(netfile->pInode);

572 pCifsInode->clientCanCacheAll = false;

573 if (pSMB->OplockLevel == 0)

574 pCifsInode->clientCanCacheRead

575 = false;

576 pCifsInode->oplockPending = true;

577 AllocOplockQEntry(netfile->pInode,

578 netfile->netfid,

579 tcon);

580 cFYI(1,

581 ("about to wake up oplock thread"));

582 if (oplockThread)

583 wake_up_process(oplockThread);

584 return true;

585 }

586 }

587 read_unlock(&GlobalSMBSeslock);

588 cFYI(1, ("No matching file for oplock break"));

589 return true;

590 }

591 }

592 read_unlock(&GlobalSMBSeslock);

593 cFYI(1, ("Can not process oplock break for non-existent connection"));

594 return true;

595 }

596

597 void

598 dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)

599 {

600 int i, j;

601 char debug_line[17];

602 unsigned char *buffer;

603

604 if (traceSMB == 0)

605 return;

606

607 buffer = (unsigned char *) smb_buf;

608 for (i = 0, j = 0; i < smb_buf_length; i++, j++) {

609 if (i % 8 == 0) {

610 /* have reached the beginning of line */

611 printk(KERN_DEBUG "| ");

612 j = 0;

613 }

614 printk("%0#4x ", buffer[i]);

615 debug_line[2 * j] = ' ';

616 if (isprint(buffer[i]))

617 debug_line[1 + (2 * j)] = buffer[i];

618 else

619 debug_line[1 + (2 * j)] = '_';

620

621 if (i % 8 == 7) {

622 /* reached end of line, time to print ascii */

623 debug_line[16] = 0;

624 printk(" | %s\n", debug_line);

625 }

626 }

627 for (; j < 8; j++) {

628 printk(" ");

629 debug_line[2 * j] = ' ';

630 debug_line[1 + (2 * j)] = ' ';

631 }

632 printk(" | %s\n", debug_line);

633 return;

634 }

635

636 /* Windows maps these to the user defined 16 bit Unicode range since they are

637 reserved symbols (along with \ and /), otherwise illegal to store

638 in filenames in NTFS */

639 #define UNI_ASTERIK (__u16) ('*' + 0xF000)

640 #define UNI_QUESTION (__u16) ('?' + 0xF000)

641 #define UNI_COLON (__u16) (':' + 0xF000)

642 #define UNI_GRTRTHAN (__u16) ('>' + 0xF000)

643 #define UNI_LESSTHAN (__u16) ('<' + 0xF000)

644 #define UNI_PIPE (__u16) ('|' + 0xF000)

645 #define UNI_SLASH (__u16) ('\\' + 0xF000)

646

647 /* Convert 16 bit Unicode pathname from wire format to string in current code

648 page. Conversion may involve remapping up the seven characters that are

649 only legal in POSIX-like OS (if they are present in the string). Path

650 names are little endian 16 bit Unicode on the wire */

651 int

652 cifs_convertUCSpath(char *target, const __le16 *source, int maxlen,

653 const struct nls_table *cp)

654 {

655 int i, j, len;

656 __u16 src_char;

657

658 for (i = 0, j = 0; i < maxlen; i++) {

659 src_char = le16_to_cpu(source[i]);

660 switch (src_char) {

661 case 0:

662 goto cUCS_out; /* BB check this BB */

663 case UNI_COLON:

664 target[j] = ':';

665 break;

666 case UNI_ASTERIK:

667 target[j] = '*';

668 break;

669 case UNI_QUESTION:

670 target[j] = '?';

671 break;

672 /* BB We can not handle remapping slash until

673 all the calls to build_path_from_dentry

674 are modified, as they use slash as separator BB */

675 /* case UNI_SLASH:

676 target[j] = '\\';

677 break;*/

678 case UNI_PIPE:

679 target[j] = '|';

680 break;

681 case UNI_GRTRTHAN:

682 target[j] = '>';

683 break;

684 case UNI_LESSTHAN:

685 target[j] = '<';

686 break;

687 default:

688 len = cp->uni2char(src_char, &target[j],

689 NLS_MAX_CHARSET_SIZE);

690 if (len > 0) {

691 j += len;

692 continue;

693 } else {

694 target[j] = '?';

695 }

696 }

697 j++;

698 /* make sure we do not overrun callers allocated temp buffer */

699 if (j >= (2 * NAME_MAX))

700 break;

701 }

702 cUCS_out:

703 target[j] = 0;

704 return j;

705 }

706

707 /* Convert 16 bit Unicode pathname to wire format from string in current code

708 page. Conversion may involve remapping up the seven characters that are

709 only legal in POSIX-like OS (if they are present in the string). Path

710 names are little endian 16 bit Unicode on the wire */

711 int

712 cifsConvertToUCS(__le16 *target, const char *source, int maxlen,

713 const struct nls_table *cp, int mapChars)

714 {

715 int i, j, charlen;

716 int len_remaining = maxlen;

717 char src_char;

718 __u16 temp;

719

720 if (!mapChars)

721 return cifs_strtoUCS(target, source, PATH_MAX, cp);

722

723 for (i = 0, j = 0; i < maxlen; j++) {

724 src_char = source[i];

725 switch (src_char) {

726 case 0:

727 target[j] = 0;

728 goto ctoUCS_out;

729 case ':':

730 target[j] = cpu_to_le16(UNI_COLON);

731 break;

732 case '*':

733 target[j] = cpu_to_le16(UNI_ASTERIK);

734 break;

735 case '?':

736 target[j] = cpu_to_le16(UNI_QUESTION);

737 break;

738 case '<':

739 target[j] = cpu_to_le16(UNI_LESSTHAN);

740 break;

741 case '>':

742 target[j] = cpu_to_le16(UNI_GRTRTHAN);

743 break;

744 case '|':

745 target[j] = cpu_to_le16(UNI_PIPE);

746 break;

747 /* BB We can not handle remapping slash until

748 all the calls to build_path_from_dentry

749 are modified, as they use slash as separator BB */

750 /* case '\\':

751 target[j] = cpu_to_le16(UNI_SLASH);

752 break;*/

753 default:

754 charlen = cp->char2uni(source+i,

755 len_remaining, &temp);

756 /* if no match, use question mark, which

757 at least in some cases servers as wild card */

758 if (charlen < 1) {

759 target[j] = cpu_to_le16(0x003f);

760 charlen = 1;

761 } else

762 target[j] = cpu_to_le16(temp);

763 len_remaining -= charlen;

764 /* character may take more than one byte in the

765 the source string, but will take exactly two

766 bytes in the target string */

767 i += charlen;

768 continue;

769 }

770 i++; /* move to next char in source string */

771 len_remaining--;

772 }

773

774 ctoUCS_out:

775 return i;

776 }