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Revert "Eliminate sparse warning - bad constant expression"
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blobec0ea4a43bdb4efc0f3734f439b6af78af97a2f4
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
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 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <net/ipv6.h>
41 #include "cifspdu.h"
42 #include "cifsglob.h"
43 #include "cifsproto.h"
44 #include "cifs_unicode.h"
45 #include "cifs_debug.h"
46 #include "cifs_fs_sb.h"
47 #include "ntlmssp.h"
48 #include "nterr.h"
49 #include "rfc1002pdu.h"
50 #include "cn_cifs.h"
51 #include "fscache.h"
52
53 #define CIFS_PORT 445
54 #define RFC1001_PORT 139
55
56 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
57 unsigned char *p24);
58
59 extern mempool_t *cifs_req_poolp;
60
61 struct smb_vol {
62 char *username;
63 char *password;
64 char *domainname;
65 char *UNC;
66 char *UNCip;
67 char *iocharset; /* local code page for mapping to and from Unicode */
68 char source_rfc1001_name[16]; /* netbios name of client */
69 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
70 uid_t cred_uid;
71 uid_t linux_uid;
72 gid_t linux_gid;
73 mode_t file_mode;
74 mode_t dir_mode;
75 unsigned secFlg;
76 bool retry:1;
77 bool intr:1;
78 bool setuids:1;
79 bool override_uid:1;
80 bool override_gid:1;
81 bool dynperm:1;
82 bool noperm:1;
83 bool no_psx_acl:1; /* set if posix acl support should be disabled */
84 bool cifs_acl:1;
85 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
86 bool server_ino:1; /* use inode numbers from server ie UniqueId */
87 bool direct_io:1;
88 bool remap:1; /* set to remap seven reserved chars in filenames */
89 bool posix_paths:1; /* unset to not ask for posix pathnames. */
90 bool no_linux_ext:1;
91 bool sfu_emul:1;
92 bool nullauth:1; /* attempt to authenticate with null user */
93 bool nocase:1; /* request case insensitive filenames */
94 bool nobrl:1; /* disable sending byte range locks to srv */
95 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
96 bool seal:1; /* request transport encryption on share */
97 bool nodfs:1; /* Do not request DFS, even if available */
98 bool local_lease:1; /* check leases only on local system, not remote */
99 bool noblocksnd:1;
100 bool noautotune:1;
101 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
102 bool fsc:1; /* enable fscache */
103 unsigned int rsize;
104 unsigned int wsize;
105 bool sockopt_tcp_nodelay:1;
106 unsigned short int port;
107 char *prepath;
108 struct nls_table *local_nls;
109 };
110
111 static int ipv4_connect(struct TCP_Server_Info *server);
112 static int ipv6_connect(struct TCP_Server_Info *server);
113
114 /*
115 * cifs tcp session reconnection
116 *
117 * mark tcp session as reconnecting so temporarily locked
118 * mark all smb sessions as reconnecting for tcp session
119 * reconnect tcp session
120 * wake up waiters on reconnection? - (not needed currently)
121 */
122 static int
123 cifs_reconnect(struct TCP_Server_Info *server)
124 {
125 int rc = 0;
126 struct list_head *tmp, *tmp2;
127 struct cifsSesInfo *ses;
128 struct cifsTconInfo *tcon;
129 struct mid_q_entry *mid_entry;
130
131 spin_lock(&GlobalMid_Lock);
132 if (server->tcpStatus == CifsExiting) {
133 /* the demux thread will exit normally
134 next time through the loop */
135 spin_unlock(&GlobalMid_Lock);
136 return rc;
137 } else
138 server->tcpStatus = CifsNeedReconnect;
139 spin_unlock(&GlobalMid_Lock);
140 server->maxBuf = 0;
141
142 cFYI(1, "Reconnecting tcp session");
143
144 /* before reconnecting the tcp session, mark the smb session (uid)
145 and the tid bad so they are not used until reconnected */
146 read_lock(&cifs_tcp_ses_lock);
147 list_for_each(tmp, &server->smb_ses_list) {
148 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
149 ses->need_reconnect = true;
150 ses->ipc_tid = 0;
151 list_for_each(tmp2, &ses->tcon_list) {
152 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
153 tcon->need_reconnect = true;
154 }
155 }
156 read_unlock(&cifs_tcp_ses_lock);
157 /* do not want to be sending data on a socket we are freeing */
158 mutex_lock(&server->srv_mutex);
159 if (server->ssocket) {
160 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
161 server->ssocket->flags);
162 kernel_sock_shutdown(server->ssocket, SHUT_WR);
163 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
164 server->ssocket->state,
165 server->ssocket->flags);
166 sock_release(server->ssocket);
167 server->ssocket = NULL;
168 }
169
170 spin_lock(&GlobalMid_Lock);
171 list_for_each(tmp, &server->pending_mid_q) {
172 mid_entry = list_entry(tmp, struct
173 mid_q_entry,
174 qhead);
175 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
176 /* Mark other intransit requests as needing
177 retry so we do not immediately mark the
178 session bad again (ie after we reconnect
179 below) as they timeout too */
180 mid_entry->midState = MID_RETRY_NEEDED;
181 }
182 }
183 spin_unlock(&GlobalMid_Lock);
184 mutex_unlock(&server->srv_mutex);
185
186 while ((server->tcpStatus != CifsExiting) &&
187 (server->tcpStatus != CifsGood)) {
188 try_to_freeze();
189 if (server->addr.sockAddr6.sin6_family == AF_INET6)
190 rc = ipv6_connect(server);
191 else
192 rc = ipv4_connect(server);
193 if (rc) {
194 cFYI(1, "reconnect error %d", rc);
195 msleep(3000);
196 } else {
197 atomic_inc(&tcpSesReconnectCount);
198 spin_lock(&GlobalMid_Lock);
199 if (server->tcpStatus != CifsExiting)
200 server->tcpStatus = CifsGood;
201 server->sequence_number = 0;
202 spin_unlock(&GlobalMid_Lock);
203 /* atomic_set(&server->inFlight,0);*/
204 wake_up(&server->response_q);
205 }
206 }
207 return rc;
208 }
209
210 /*
211 return codes:
212 0 not a transact2, or all data present
213 >0 transact2 with that much data missing
214 -EINVAL = invalid transact2
215
216 */
217 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
218 {
219 struct smb_t2_rsp *pSMBt;
220 int total_data_size;
221 int data_in_this_rsp;
222 int remaining;
223
224 if (pSMB->Command != SMB_COM_TRANSACTION2)
225 return 0;
226
227 /* check for plausible wct, bcc and t2 data and parm sizes */
228 /* check for parm and data offset going beyond end of smb */
229 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
230 cFYI(1, "invalid transact2 word count");
231 return -EINVAL;
232 }
233
234 pSMBt = (struct smb_t2_rsp *)pSMB;
235
236 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
237 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
238
239 remaining = total_data_size - data_in_this_rsp;
240
241 if (remaining == 0)
242 return 0;
243 else if (remaining < 0) {
244 cFYI(1, "total data %d smaller than data in frame %d",
245 total_data_size, data_in_this_rsp);
246 return -EINVAL;
247 } else {
248 cFYI(1, "missing %d bytes from transact2, check next response",
249 remaining);
250 if (total_data_size > maxBufSize) {
251 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
252 total_data_size, maxBufSize);
253 return -EINVAL;
254 }
255 return remaining;
256 }
257 }
258
259 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
260 {
261 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
262 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
263 int total_data_size;
264 int total_in_buf;
265 int remaining;
266 int total_in_buf2;
267 char *data_area_of_target;
268 char *data_area_of_buf2;
269 __u16 byte_count;
270
271 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
272
273 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
274 cFYI(1, "total data size of primary and secondary t2 differ");
275 }
276
277 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
278
279 remaining = total_data_size - total_in_buf;
280
281 if (remaining < 0)
282 return -EINVAL;
283
284 if (remaining == 0) /* nothing to do, ignore */
285 return 0;
286
287 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
288 if (remaining < total_in_buf2) {
289 cFYI(1, "transact2 2nd response contains too much data");
290 }
291
292 /* find end of first SMB data area */
293 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
294 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
295 /* validate target area */
296
297 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
298 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
299
300 data_area_of_target += total_in_buf;
301
302 /* copy second buffer into end of first buffer */
303 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
304 total_in_buf += total_in_buf2;
305 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
306 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
307 byte_count += total_in_buf2;
308 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
309
310 byte_count = pTargetSMB->smb_buf_length;
311 byte_count += total_in_buf2;
312
313 /* BB also add check that we are not beyond maximum buffer size */
314
315 pTargetSMB->smb_buf_length = byte_count;
316
317 if (remaining == total_in_buf2) {
318 cFYI(1, "found the last secondary response");
319 return 0; /* we are done */
320 } else /* more responses to go */
321 return 1;
322
323 }
324
325 static int
326 cifs_demultiplex_thread(struct TCP_Server_Info *server)
327 {
328 int length;
329 unsigned int pdu_length, total_read;
330 struct smb_hdr *smb_buffer = NULL;
331 struct smb_hdr *bigbuf = NULL;
332 struct smb_hdr *smallbuf = NULL;
333 struct msghdr smb_msg;
334 struct kvec iov;
335 struct socket *csocket = server->ssocket;
336 struct list_head *tmp;
337 struct cifsSesInfo *ses;
338 struct task_struct *task_to_wake = NULL;
339 struct mid_q_entry *mid_entry;
340 char temp;
341 bool isLargeBuf = false;
342 bool isMultiRsp;
343 int reconnect;
344
345 current->flags |= PF_MEMALLOC;
346 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
347
348 length = atomic_inc_return(&tcpSesAllocCount);
349 if (length > 1)
350 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
351 GFP_KERNEL);
352
353 set_freezable();
354 while (server->tcpStatus != CifsExiting) {
355 if (try_to_freeze())
356 continue;
357 if (bigbuf == NULL) {
358 bigbuf = cifs_buf_get();
359 if (!bigbuf) {
360 cERROR(1, "No memory for large SMB response");
361 msleep(3000);
362 /* retry will check if exiting */
363 continue;
364 }
365 } else if (isLargeBuf) {
366 /* we are reusing a dirty large buf, clear its start */
367 memset(bigbuf, 0, sizeof(struct smb_hdr));
368 }
369
370 if (smallbuf == NULL) {
371 smallbuf = cifs_small_buf_get();
372 if (!smallbuf) {
373 cERROR(1, "No memory for SMB response");
374 msleep(1000);
375 /* retry will check if exiting */
376 continue;
377 }
378 /* beginning of smb buffer is cleared in our buf_get */
379 } else /* if existing small buf clear beginning */
380 memset(smallbuf, 0, sizeof(struct smb_hdr));
381
382 isLargeBuf = false;
383 isMultiRsp = false;
384 smb_buffer = smallbuf;
385 iov.iov_base = smb_buffer;
386 iov.iov_len = 4;
387 smb_msg.msg_control = NULL;
388 smb_msg.msg_controllen = 0;
389 pdu_length = 4; /* enough to get RFC1001 header */
390 incomplete_rcv:
391 length =
392 kernel_recvmsg(csocket, &smb_msg,
393 &iov, 1, pdu_length, 0 /* BB other flags? */);
394
395 if (server->tcpStatus == CifsExiting) {
396 break;
397 } else if (server->tcpStatus == CifsNeedReconnect) {
398 cFYI(1, "Reconnect after server stopped responding");
399 cifs_reconnect(server);
400 cFYI(1, "call to reconnect done");
401 csocket = server->ssocket;
402 continue;
403 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
404 msleep(1); /* minimum sleep to prevent looping
405 allowing socket to clear and app threads to set
406 tcpStatus CifsNeedReconnect if server hung */
407 if (pdu_length < 4) {
408 iov.iov_base = (4 - pdu_length) +
409 (char *)smb_buffer;
410 iov.iov_len = pdu_length;
411 smb_msg.msg_control = NULL;
412 smb_msg.msg_controllen = 0;
413 goto incomplete_rcv;
414 } else
415 continue;
416 } else if (length <= 0) {
417 if (server->tcpStatus == CifsNew) {
418 cFYI(1, "tcp session abend after SMBnegprot");
419 /* some servers kill the TCP session rather than
420 returning an SMB negprot error, in which
421 case reconnecting here is not going to help,
422 and so simply return error to mount */
423 break;
424 }
425 if (!try_to_freeze() && (length == -EINTR)) {
426 cFYI(1, "cifsd thread killed");
427 break;
428 }
429 cFYI(1, "Reconnect after unexpected peek error %d",
430 length);
431 cifs_reconnect(server);
432 csocket = server->ssocket;
433 wake_up(&server->response_q);
434 continue;
435 } else if (length < pdu_length) {
436 cFYI(1, "requested %d bytes but only got %d bytes",
437 pdu_length, length);
438 pdu_length -= length;
439 msleep(1);
440 goto incomplete_rcv;
441 }
442
443 /* The right amount was read from socket - 4 bytes */
444 /* so we can now interpret the length field */
445
446 /* the first byte big endian of the length field,
447 is actually not part of the length but the type
448 with the most common, zero, as regular data */
449 temp = *((char *) smb_buffer);
450
451 /* Note that FC 1001 length is big endian on the wire,
452 but we convert it here so it is always manipulated
453 as host byte order */
454 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
455 smb_buffer->smb_buf_length = pdu_length;
456
457 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
458
459 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
460 continue;
461 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
462 cFYI(1, "Good RFC 1002 session rsp");
463 continue;
464 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
465 /* we get this from Windows 98 instead of
466 an error on SMB negprot response */
467 cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
468 pdu_length);
469 if (server->tcpStatus == CifsNew) {
470 /* if nack on negprot (rather than
471 ret of smb negprot error) reconnecting
472 not going to help, ret error to mount */
473 break;
474 } else {
475 /* give server a second to
476 clean up before reconnect attempt */
477 msleep(1000);
478 /* always try 445 first on reconnect
479 since we get NACK on some if we ever
480 connected to port 139 (the NACK is
481 since we do not begin with RFC1001
482 session initialize frame) */
483 server->addr.sockAddr.sin_port =
484 htons(CIFS_PORT);
485 cifs_reconnect(server);
486 csocket = server->ssocket;
487 wake_up(&server->response_q);
488 continue;
489 }
490 } else if (temp != (char) 0) {
491 cERROR(1, "Unknown RFC 1002 frame");
492 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
493 length);
494 cifs_reconnect(server);
495 csocket = server->ssocket;
496 continue;
497 }
498
499 /* else we have an SMB response */
500 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
501 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
502 cERROR(1, "Invalid size SMB length %d pdu_length %d",
503 length, pdu_length+4);
504 cifs_reconnect(server);
505 csocket = server->ssocket;
506 wake_up(&server->response_q);
507 continue;
508 }
509
510 /* else length ok */
511 reconnect = 0;
512
513 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
514 isLargeBuf = true;
515 memcpy(bigbuf, smallbuf, 4);
516 smb_buffer = bigbuf;
517 }
518 length = 0;
519 iov.iov_base = 4 + (char *)smb_buffer;
520 iov.iov_len = pdu_length;
521 for (total_read = 0; total_read < pdu_length;
522 total_read += length) {
523 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
524 pdu_length - total_read, 0);
525 if ((server->tcpStatus == CifsExiting) ||
526 (length == -EINTR)) {
527 /* then will exit */
528 reconnect = 2;
529 break;
530 } else if (server->tcpStatus == CifsNeedReconnect) {
531 cifs_reconnect(server);
532 csocket = server->ssocket;
533 /* Reconnect wakes up rspns q */
534 /* Now we will reread sock */
535 reconnect = 1;
536 break;
537 } else if ((length == -ERESTARTSYS) ||
538 (length == -EAGAIN)) {
539 msleep(1); /* minimum sleep to prevent looping,
540 allowing socket to clear and app
541 threads to set tcpStatus
542 CifsNeedReconnect if server hung*/
543 length = 0;
544 continue;
545 } else if (length <= 0) {
546 cERROR(1, "Received no data, expecting %d",
547 pdu_length - total_read);
548 cifs_reconnect(server);
549 csocket = server->ssocket;
550 reconnect = 1;
551 break;
552 }
553 }
554 if (reconnect == 2)
555 break;
556 else if (reconnect == 1)
557 continue;
558
559 length += 4; /* account for rfc1002 hdr */
560
561
562 dump_smb(smb_buffer, length);
563 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
564 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
565 continue;
566 }
567
568
569 task_to_wake = NULL;
570 spin_lock(&GlobalMid_Lock);
571 list_for_each(tmp, &server->pending_mid_q) {
572 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
573
574 if ((mid_entry->mid == smb_buffer->Mid) &&
575 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
576 (mid_entry->command == smb_buffer->Command)) {
577 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
578 /* We have a multipart transact2 resp */
579 isMultiRsp = true;
580 if (mid_entry->resp_buf) {
581 /* merge response - fix up 1st*/
582 if (coalesce_t2(smb_buffer,
583 mid_entry->resp_buf)) {
584 mid_entry->multiRsp =
585 true;
586 break;
587 } else {
588 /* all parts received */
589 mid_entry->multiEnd =
590 true;
591 goto multi_t2_fnd;
592 }
593 } else {
594 if (!isLargeBuf) {
595 cERROR(1, "1st trans2 resp needs bigbuf");
596 /* BB maybe we can fix this up, switch
597 to already allocated large buffer? */
598 } else {
599 /* Have first buffer */
600 mid_entry->resp_buf =
601 smb_buffer;
602 mid_entry->largeBuf =
603 true;
604 bigbuf = NULL;
605 }
606 }
607 break;
608 }
609 mid_entry->resp_buf = smb_buffer;
610 mid_entry->largeBuf = isLargeBuf;
611 multi_t2_fnd:
612 task_to_wake = mid_entry->tsk;
613 mid_entry->midState = MID_RESPONSE_RECEIVED;
614 #ifdef CONFIG_CIFS_STATS2
615 mid_entry->when_received = jiffies;
616 #endif
617 /* so we do not time out requests to server
618 which is still responding (since server could
619 be busy but not dead) */
620 server->lstrp = jiffies;
621 break;
622 }
623 }
624 spin_unlock(&GlobalMid_Lock);
625 if (task_to_wake) {
626 /* Was previous buf put in mpx struct for multi-rsp? */
627 if (!isMultiRsp) {
628 /* smb buffer will be freed by user thread */
629 if (isLargeBuf)
630 bigbuf = NULL;
631 else
632 smallbuf = NULL;
633 }
634 wake_up_process(task_to_wake);
635 } else if (!is_valid_oplock_break(smb_buffer, server) &&
636 !isMultiRsp) {
637 cERROR(1, "No task to wake, unknown frame received! "
638 "NumMids %d", midCount.counter);
639 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
640 sizeof(struct smb_hdr));
641 #ifdef CONFIG_CIFS_DEBUG2
642 cifs_dump_detail(smb_buffer);
643 cifs_dump_mids(server);
644 #endif /* CIFS_DEBUG2 */
645
646 }
647 } /* end while !EXITING */
648
649 /* take it off the list, if it's not already */
650 write_lock(&cifs_tcp_ses_lock);
651 list_del_init(&server->tcp_ses_list);
652 write_unlock(&cifs_tcp_ses_lock);
653
654 spin_lock(&GlobalMid_Lock);
655 server->tcpStatus = CifsExiting;
656 spin_unlock(&GlobalMid_Lock);
657 wake_up_all(&server->response_q);
658
659 /* check if we have blocked requests that need to free */
660 /* Note that cifs_max_pending is normally 50, but
661 can be set at module install time to as little as two */
662 spin_lock(&GlobalMid_Lock);
663 if (atomic_read(&server->inFlight) >= cifs_max_pending)
664 atomic_set(&server->inFlight, cifs_max_pending - 1);
665 /* We do not want to set the max_pending too low or we
666 could end up with the counter going negative */
667 spin_unlock(&GlobalMid_Lock);
668 /* Although there should not be any requests blocked on
669 this queue it can not hurt to be paranoid and try to wake up requests
670 that may haven been blocked when more than 50 at time were on the wire
671 to the same server - they now will see the session is in exit state
672 and get out of SendReceive. */
673 wake_up_all(&server->request_q);
674 /* give those requests time to exit */
675 msleep(125);
676
677 if (server->ssocket) {
678 sock_release(csocket);
679 server->ssocket = NULL;
680 }
681 /* buffer usuallly freed in free_mid - need to free it here on exit */
682 cifs_buf_release(bigbuf);
683 if (smallbuf) /* no sense logging a debug message if NULL */
684 cifs_small_buf_release(smallbuf);
685
686 /*
687 * BB: we shouldn't have to do any of this. It shouldn't be
688 * possible to exit from the thread with active SMB sessions
689 */
690 read_lock(&cifs_tcp_ses_lock);
691 if (list_empty(&server->pending_mid_q)) {
692 /* loop through server session structures attached to this and
693 mark them dead */
694 list_for_each(tmp, &server->smb_ses_list) {
695 ses = list_entry(tmp, struct cifsSesInfo,
696 smb_ses_list);
697 ses->status = CifsExiting;
698 ses->server = NULL;
699 }
700 read_unlock(&cifs_tcp_ses_lock);
701 } else {
702 /* although we can not zero the server struct pointer yet,
703 since there are active requests which may depnd on them,
704 mark the corresponding SMB sessions as exiting too */
705 list_for_each(tmp, &server->smb_ses_list) {
706 ses = list_entry(tmp, struct cifsSesInfo,
707 smb_ses_list);
708 ses->status = CifsExiting;
709 }
710
711 spin_lock(&GlobalMid_Lock);
712 list_for_each(tmp, &server->pending_mid_q) {
713 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
714 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
715 cFYI(1, "Clearing Mid 0x%x - waking up ",
716 mid_entry->mid);
717 task_to_wake = mid_entry->tsk;
718 if (task_to_wake)
719 wake_up_process(task_to_wake);
720 }
721 }
722 spin_unlock(&GlobalMid_Lock);
723 read_unlock(&cifs_tcp_ses_lock);
724 /* 1/8th of sec is more than enough time for them to exit */
725 msleep(125);
726 }
727
728 if (!list_empty(&server->pending_mid_q)) {
729 /* mpx threads have not exited yet give them
730 at least the smb send timeout time for long ops */
731 /* due to delays on oplock break requests, we need
732 to wait at least 45 seconds before giving up
733 on a request getting a response and going ahead
734 and killing cifsd */
735 cFYI(1, "Wait for exit from demultiplex thread");
736 msleep(46000);
737 /* if threads still have not exited they are probably never
738 coming home not much else we can do but free the memory */
739 }
740
741 /* last chance to mark ses pointers invalid
742 if there are any pointing to this (e.g
743 if a crazy root user tried to kill cifsd
744 kernel thread explicitly this might happen) */
745 /* BB: This shouldn't be necessary, see above */
746 read_lock(&cifs_tcp_ses_lock);
747 list_for_each(tmp, &server->smb_ses_list) {
748 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
749 ses->server = NULL;
750 }
751 read_unlock(&cifs_tcp_ses_lock);
752
753 kfree(server->hostname);
754 task_to_wake = xchg(&server->tsk, NULL);
755 kfree(server);
756
757 length = atomic_dec_return(&tcpSesAllocCount);
758 if (length > 0)
759 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
760 GFP_KERNEL);
761
762 /* if server->tsk was NULL then wait for a signal before exiting */
763 if (!task_to_wake) {
764 set_current_state(TASK_INTERRUPTIBLE);
765 while (!signal_pending(current)) {
766 schedule();
767 set_current_state(TASK_INTERRUPTIBLE);
768 }
769 set_current_state(TASK_RUNNING);
770 }
771
772 module_put_and_exit(0);
773 }
774
775 /* extract the host portion of the UNC string */
776 static char *
777 extract_hostname(const char *unc)
778 {
779 const char *src;
780 char *dst, *delim;
781 unsigned int len;
782
783 /* skip double chars at beginning of string */
784 /* BB: check validity of these bytes? */
785 src = unc + 2;
786
787 /* delimiter between hostname and sharename is always '\\' now */
788 delim = strchr(src, '\\');
789 if (!delim)
790 return ERR_PTR(-EINVAL);
791
792 len = delim - src;
793 dst = kmalloc((len + 1), GFP_KERNEL);
794 if (dst == NULL)
795 return ERR_PTR(-ENOMEM);
796
797 memcpy(dst, src, len);
798 dst[len] = '\0';
799
800 return dst;
801 }
802
803 static int
804 cifs_parse_mount_options(char *options, const char *devname,
805 struct smb_vol *vol)
806 {
807 char *value;
808 char *data;
809 unsigned int temp_len, i, j;
810 char separator[2];
811 short int override_uid = -1;
812 short int override_gid = -1;
813 bool uid_specified = false;
814 bool gid_specified = false;
815
816 separator[0] = ',';
817 separator[1] = 0;
818
819 if (Local_System_Name[0] != 0)
820 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
821 else {
822 char *nodename = utsname()->nodename;
823 int n = strnlen(nodename, 15);
824 memset(vol->source_rfc1001_name, 0x20, 15);
825 for (i = 0; i < n; i++) {
826 /* does not have to be perfect mapping since field is
827 informational, only used for servers that do not support
828 port 445 and it can be overridden at mount time */
829 vol->source_rfc1001_name[i] = toupper(nodename[i]);
830 }
831 }
832 vol->source_rfc1001_name[15] = 0;
833 /* null target name indicates to use *SMBSERVR default called name
834 if we end up sending RFC1001 session initialize */
835 vol->target_rfc1001_name[0] = 0;
836 vol->cred_uid = current_uid();
837 vol->linux_uid = current_uid();
838 vol->linux_gid = current_gid();
839
840 /* default to only allowing write access to owner of the mount */
841 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
842
843 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
844 /* default is always to request posix paths. */
845 vol->posix_paths = 1;
846 /* default to using server inode numbers where available */
847 vol->server_ino = 1;
848
849 if (!options)
850 return 1;
851
852 if (strncmp(options, "sep=", 4) == 0) {
853 if (options[4] != 0) {
854 separator[0] = options[4];
855 options += 5;
856 } else {
857 cFYI(1, "Null separator not allowed");
858 }
859 }
860
861 while ((data = strsep(&options, separator)) != NULL) {
862 if (!*data)
863 continue;
864 if ((value = strchr(data, '=')) != NULL)
865 *value++ = '\0';
866
867 /* Have to parse this before we parse for "user" */
868 if (strnicmp(data, "user_xattr", 10) == 0) {
869 vol->no_xattr = 0;
870 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
871 vol->no_xattr = 1;
872 } else if (strnicmp(data, "user", 4) == 0) {
873 if (!value) {
874 printk(KERN_WARNING
875 "CIFS: invalid or missing username\n");
876 return 1; /* needs_arg; */
877 } else if (!*value) {
878 /* null user, ie anonymous, authentication */
879 vol->nullauth = 1;
880 }
881 if (strnlen(value, 200) < 200) {
882 vol->username = value;
883 } else {
884 printk(KERN_WARNING "CIFS: username too long\n");
885 return 1;
886 }
887 } else if (strnicmp(data, "pass", 4) == 0) {
888 if (!value) {
889 vol->password = NULL;
890 continue;
891 } else if (value[0] == 0) {
892 /* check if string begins with double comma
893 since that would mean the password really
894 does start with a comma, and would not
895 indicate an empty string */
896 if (value[1] != separator[0]) {
897 vol->password = NULL;
898 continue;
899 }
900 }
901 temp_len = strlen(value);
902 /* removed password length check, NTLM passwords
903 can be arbitrarily long */
904
905 /* if comma in password, the string will be
906 prematurely null terminated. Commas in password are
907 specified across the cifs mount interface by a double
908 comma ie ,, and a comma used as in other cases ie ','
909 as a parameter delimiter/separator is single and due
910 to the strsep above is temporarily zeroed. */
911
912 /* NB: password legally can have multiple commas and
913 the only illegal character in a password is null */
914
915 if ((value[temp_len] == 0) &&
916 (value[temp_len+1] == separator[0])) {
917 /* reinsert comma */
918 value[temp_len] = separator[0];
919 temp_len += 2; /* move after second comma */
920 while (value[temp_len] != 0) {
921 if (value[temp_len] == separator[0]) {
922 if (value[temp_len+1] ==
923 separator[0]) {
924 /* skip second comma */
925 temp_len++;
926 } else {
927 /* single comma indicating start
928 of next parm */
929 break;
930 }
931 }
932 temp_len++;
933 }
934 if (value[temp_len] == 0) {
935 options = NULL;
936 } else {
937 value[temp_len] = 0;
938 /* point option to start of next parm */
939 options = value + temp_len + 1;
940 }
941 /* go from value to value + temp_len condensing
942 double commas to singles. Note that this ends up
943 allocating a few bytes too many, which is ok */
944 vol->password = kzalloc(temp_len, GFP_KERNEL);
945 if (vol->password == NULL) {
946 printk(KERN_WARNING "CIFS: no memory "
947 "for password\n");
948 return 1;
949 }
950 for (i = 0, j = 0; i < temp_len; i++, j++) {
951 vol->password[j] = value[i];
952 if (value[i] == separator[0]
953 && value[i+1] == separator[0]) {
954 /* skip second comma */
955 i++;
956 }
957 }
958 vol->password[j] = 0;
959 } else {
960 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
961 if (vol->password == NULL) {
962 printk(KERN_WARNING "CIFS: no memory "
963 "for password\n");
964 return 1;
965 }
966 strcpy(vol->password, value);
967 }
968 } else if (!strnicmp(data, "ip", 2) ||
969 !strnicmp(data, "addr", 4)) {
970 if (!value || !*value) {
971 vol->UNCip = NULL;
972 } else if (strnlen(value, INET6_ADDRSTRLEN) <
973 INET6_ADDRSTRLEN) {
974 vol->UNCip = value;
975 } else {
976 printk(KERN_WARNING "CIFS: ip address "
977 "too long\n");
978 return 1;
979 }
980 } else if (strnicmp(data, "sec", 3) == 0) {
981 if (!value || !*value) {
982 cERROR(1, "no security value specified");
983 continue;
984 } else if (strnicmp(value, "krb5i", 5) == 0) {
985 vol->secFlg |= CIFSSEC_MAY_KRB5 |
986 CIFSSEC_MUST_SIGN;
987 } else if (strnicmp(value, "krb5p", 5) == 0) {
988 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
989 CIFSSEC_MAY_KRB5; */
990 cERROR(1, "Krb5 cifs privacy not supported");
991 return 1;
992 } else if (strnicmp(value, "krb5", 4) == 0) {
993 vol->secFlg |= CIFSSEC_MAY_KRB5;
994 #ifdef CONFIG_CIFS_EXPERIMENTAL
995 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
996 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
997 CIFSSEC_MUST_SIGN;
998 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
999 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1000 #endif
1001 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
1002 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1003 CIFSSEC_MUST_SIGN;
1004 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1005 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1006 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1007 vol->secFlg |= CIFSSEC_MAY_NTLM |
1008 CIFSSEC_MUST_SIGN;
1009 } else if (strnicmp(value, "ntlm", 4) == 0) {
1010 /* ntlm is default so can be turned off too */
1011 vol->secFlg |= CIFSSEC_MAY_NTLM;
1012 } else if (strnicmp(value, "nontlm", 6) == 0) {
1013 /* BB is there a better way to do this? */
1014 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1015 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1016 } else if (strnicmp(value, "lanman", 6) == 0) {
1017 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1018 #endif
1019 } else if (strnicmp(value, "none", 4) == 0) {
1020 vol->nullauth = 1;
1021 } else {
1022 cERROR(1, "bad security option: %s", value);
1023 return 1;
1024 }
1025 } else if ((strnicmp(data, "unc", 3) == 0)
1026 || (strnicmp(data, "target", 6) == 0)
1027 || (strnicmp(data, "path", 4) == 0)) {
1028 if (!value || !*value) {
1029 printk(KERN_WARNING "CIFS: invalid path to "
1030 "network resource\n");
1031 return 1; /* needs_arg; */
1032 }
1033 if ((temp_len = strnlen(value, 300)) < 300) {
1034 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1035 if (vol->UNC == NULL)
1036 return 1;
1037 strcpy(vol->UNC, value);
1038 if (strncmp(vol->UNC, "//", 2) == 0) {
1039 vol->UNC[0] = '\\';
1040 vol->UNC[1] = '\\';
1041 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1042 printk(KERN_WARNING
1043 "CIFS: UNC Path does not begin "
1044 "with // or \\\\ \n");
1045 return 1;
1046 }
1047 } else {
1048 printk(KERN_WARNING "CIFS: UNC name too long\n");
1049 return 1;
1050 }
1051 } else if ((strnicmp(data, "domain", 3) == 0)
1052 || (strnicmp(data, "workgroup", 5) == 0)) {
1053 if (!value || !*value) {
1054 printk(KERN_WARNING "CIFS: invalid domain name\n");
1055 return 1; /* needs_arg; */
1056 }
1057 /* BB are there cases in which a comma can be valid in
1058 a domain name and need special handling? */
1059 if (strnlen(value, 256) < 256) {
1060 vol->domainname = value;
1061 cFYI(1, "Domain name set");
1062 } else {
1063 printk(KERN_WARNING "CIFS: domain name too "
1064 "long\n");
1065 return 1;
1066 }
1067 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1068 if (!value || !*value) {
1069 printk(KERN_WARNING
1070 "CIFS: invalid path prefix\n");
1071 return 1; /* needs_argument */
1072 }
1073 if ((temp_len = strnlen(value, 1024)) < 1024) {
1074 if (value[0] != '/')
1075 temp_len++; /* missing leading slash */
1076 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1077 if (vol->prepath == NULL)
1078 return 1;
1079 if (value[0] != '/') {
1080 vol->prepath[0] = '/';
1081 strcpy(vol->prepath+1, value);
1082 } else
1083 strcpy(vol->prepath, value);
1084 cFYI(1, "prefix path %s", vol->prepath);
1085 } else {
1086 printk(KERN_WARNING "CIFS: prefix too long\n");
1087 return 1;
1088 }
1089 } else if (strnicmp(data, "iocharset", 9) == 0) {
1090 if (!value || !*value) {
1091 printk(KERN_WARNING "CIFS: invalid iocharset "
1092 "specified\n");
1093 return 1; /* needs_arg; */
1094 }
1095 if (strnlen(value, 65) < 65) {
1096 if (strnicmp(value, "default", 7))
1097 vol->iocharset = value;
1098 /* if iocharset not set then load_nls_default
1099 is used by caller */
1100 cFYI(1, "iocharset set to %s", value);
1101 } else {
1102 printk(KERN_WARNING "CIFS: iocharset name "
1103 "too long.\n");
1104 return 1;
1105 }
1106 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1107 vol->linux_uid = simple_strtoul(value, &value, 0);
1108 uid_specified = true;
1109 } else if (!strnicmp(data, "forceuid", 8)) {
1110 override_uid = 1;
1111 } else if (!strnicmp(data, "noforceuid", 10)) {
1112 override_uid = 0;
1113 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1114 vol->linux_gid = simple_strtoul(value, &value, 0);
1115 gid_specified = true;
1116 } else if (!strnicmp(data, "forcegid", 8)) {
1117 override_gid = 1;
1118 } else if (!strnicmp(data, "noforcegid", 10)) {
1119 override_gid = 0;
1120 } else if (strnicmp(data, "file_mode", 4) == 0) {
1121 if (value && *value) {
1122 vol->file_mode =
1123 simple_strtoul(value, &value, 0);
1124 }
1125 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1126 if (value && *value) {
1127 vol->dir_mode =
1128 simple_strtoul(value, &value, 0);
1129 }
1130 } else if (strnicmp(data, "dirmode", 4) == 0) {
1131 if (value && *value) {
1132 vol->dir_mode =
1133 simple_strtoul(value, &value, 0);
1134 }
1135 } else if (strnicmp(data, "port", 4) == 0) {
1136 if (value && *value) {
1137 vol->port =
1138 simple_strtoul(value, &value, 0);
1139 }
1140 } else if (strnicmp(data, "rsize", 5) == 0) {
1141 if (value && *value) {
1142 vol->rsize =
1143 simple_strtoul(value, &value, 0);
1144 }
1145 } else if (strnicmp(data, "wsize", 5) == 0) {
1146 if (value && *value) {
1147 vol->wsize =
1148 simple_strtoul(value, &value, 0);
1149 }
1150 } else if (strnicmp(data, "sockopt", 5) == 0) {
1151 if (!value || !*value) {
1152 cERROR(1, "no socket option specified");
1153 continue;
1154 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1155 vol->sockopt_tcp_nodelay = 1;
1156 }
1157 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1158 if (!value || !*value || (*value == ' ')) {
1159 cFYI(1, "invalid (empty) netbiosname");
1160 } else {
1161 memset(vol->source_rfc1001_name, 0x20, 15);
1162 for (i = 0; i < 15; i++) {
1163 /* BB are there cases in which a comma can be
1164 valid in this workstation netbios name (and need
1165 special handling)? */
1166
1167 /* We do not uppercase netbiosname for user */
1168 if (value[i] == 0)
1169 break;
1170 else
1171 vol->source_rfc1001_name[i] =
1172 value[i];
1173 }
1174 /* The string has 16th byte zero still from
1175 set at top of the function */
1176 if ((i == 15) && (value[i] != 0))
1177 printk(KERN_WARNING "CIFS: netbiosname"
1178 " longer than 15 truncated.\n");
1179 }
1180 } else if (strnicmp(data, "servern", 7) == 0) {
1181 /* servernetbiosname specified override *SMBSERVER */
1182 if (!value || !*value || (*value == ' ')) {
1183 cFYI(1, "empty server netbiosname specified");
1184 } else {
1185 /* last byte, type, is 0x20 for servr type */
1186 memset(vol->target_rfc1001_name, 0x20, 16);
1187
1188 for (i = 0; i < 15; i++) {
1189 /* BB are there cases in which a comma can be
1190 valid in this workstation netbios name
1191 (and need special handling)? */
1192
1193 /* user or mount helper must uppercase
1194 the netbiosname */
1195 if (value[i] == 0)
1196 break;
1197 else
1198 vol->target_rfc1001_name[i] =
1199 value[i];
1200 }
1201 /* The string has 16th byte zero still from
1202 set at top of the function */
1203 if ((i == 15) && (value[i] != 0))
1204 printk(KERN_WARNING "CIFS: server net"
1205 "biosname longer than 15 truncated.\n");
1206 }
1207 } else if (strnicmp(data, "credentials", 4) == 0) {
1208 /* ignore */
1209 } else if (strnicmp(data, "version", 3) == 0) {
1210 /* ignore */
1211 } else if (strnicmp(data, "guest", 5) == 0) {
1212 /* ignore */
1213 } else if (strnicmp(data, "rw", 2) == 0) {
1214 /* ignore */
1215 } else if (strnicmp(data, "ro", 2) == 0) {
1216 /* ignore */
1217 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1218 vol->noblocksnd = 1;
1219 } else if (strnicmp(data, "noautotune", 10) == 0) {
1220 vol->noautotune = 1;
1221 } else if ((strnicmp(data, "suid", 4) == 0) ||
1222 (strnicmp(data, "nosuid", 6) == 0) ||
1223 (strnicmp(data, "exec", 4) == 0) ||
1224 (strnicmp(data, "noexec", 6) == 0) ||
1225 (strnicmp(data, "nodev", 5) == 0) ||
1226 (strnicmp(data, "noauto", 6) == 0) ||
1227 (strnicmp(data, "dev", 3) == 0)) {
1228 /* The mount tool or mount.cifs helper (if present)
1229 uses these opts to set flags, and the flags are read
1230 by the kernel vfs layer before we get here (ie
1231 before read super) so there is no point trying to
1232 parse these options again and set anything and it
1233 is ok to just ignore them */
1234 continue;
1235 } else if (strnicmp(data, "hard", 4) == 0) {
1236 vol->retry = 1;
1237 } else if (strnicmp(data, "soft", 4) == 0) {
1238 vol->retry = 0;
1239 } else if (strnicmp(data, "perm", 4) == 0) {
1240 vol->noperm = 0;
1241 } else if (strnicmp(data, "noperm", 6) == 0) {
1242 vol->noperm = 1;
1243 } else if (strnicmp(data, "mapchars", 8) == 0) {
1244 vol->remap = 1;
1245 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1246 vol->remap = 0;
1247 } else if (strnicmp(data, "sfu", 3) == 0) {
1248 vol->sfu_emul = 1;
1249 } else if (strnicmp(data, "nosfu", 5) == 0) {
1250 vol->sfu_emul = 0;
1251 } else if (strnicmp(data, "nodfs", 5) == 0) {
1252 vol->nodfs = 1;
1253 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1254 vol->posix_paths = 1;
1255 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1256 vol->posix_paths = 0;
1257 } else if (strnicmp(data, "nounix", 6) == 0) {
1258 vol->no_linux_ext = 1;
1259 } else if (strnicmp(data, "nolinux", 7) == 0) {
1260 vol->no_linux_ext = 1;
1261 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1262 (strnicmp(data, "ignorecase", 10) == 0)) {
1263 vol->nocase = 1;
1264 } else if (strnicmp(data, "mand", 4) == 0) {
1265 /* ignore */
1266 } else if (strnicmp(data, "nomand", 6) == 0) {
1267 /* ignore */
1268 } else if (strnicmp(data, "_netdev", 7) == 0) {
1269 /* ignore */
1270 } else if (strnicmp(data, "brl", 3) == 0) {
1271 vol->nobrl = 0;
1272 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1273 (strnicmp(data, "nolock", 6) == 0)) {
1274 vol->nobrl = 1;
1275 /* turn off mandatory locking in mode
1276 if remote locking is turned off since the
1277 local vfs will do advisory */
1278 if (vol->file_mode ==
1279 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1280 vol->file_mode = S_IALLUGO;
1281 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1282 /* will take the shorter form "forcemand" as well */
1283 /* This mount option will force use of mandatory
1284 (DOS/Windows style) byte range locks, instead of
1285 using posix advisory byte range locks, even if the
1286 Unix extensions are available and posix locks would
1287 be supported otherwise. If Unix extensions are not
1288 negotiated this has no effect since mandatory locks
1289 would be used (mandatory locks is all that those
1290 those servers support) */
1291 vol->mand_lock = 1;
1292 } else if (strnicmp(data, "setuids", 7) == 0) {
1293 vol->setuids = 1;
1294 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1295 vol->setuids = 0;
1296 } else if (strnicmp(data, "dynperm", 7) == 0) {
1297 vol->dynperm = true;
1298 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1299 vol->dynperm = false;
1300 } else if (strnicmp(data, "nohard", 6) == 0) {
1301 vol->retry = 0;
1302 } else if (strnicmp(data, "nosoft", 6) == 0) {
1303 vol->retry = 1;
1304 } else if (strnicmp(data, "nointr", 6) == 0) {
1305 vol->intr = 0;
1306 } else if (strnicmp(data, "intr", 4) == 0) {
1307 vol->intr = 1;
1308 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1309 vol->nostrictsync = 1;
1310 } else if (strnicmp(data, "strictsync", 10) == 0) {
1311 vol->nostrictsync = 0;
1312 } else if (strnicmp(data, "serverino", 7) == 0) {
1313 vol->server_ino = 1;
1314 } else if (strnicmp(data, "noserverino", 9) == 0) {
1315 vol->server_ino = 0;
1316 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1317 vol->cifs_acl = 1;
1318 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1319 vol->cifs_acl = 0;
1320 } else if (strnicmp(data, "acl", 3) == 0) {
1321 vol->no_psx_acl = 0;
1322 } else if (strnicmp(data, "noacl", 5) == 0) {
1323 vol->no_psx_acl = 1;
1324 #ifdef CONFIG_CIFS_EXPERIMENTAL
1325 } else if (strnicmp(data, "locallease", 6) == 0) {
1326 vol->local_lease = 1;
1327 #endif
1328 } else if (strnicmp(data, "sign", 4) == 0) {
1329 vol->secFlg |= CIFSSEC_MUST_SIGN;
1330 } else if (strnicmp(data, "seal", 4) == 0) {
1331 /* we do not do the following in secFlags because seal
1332 is a per tree connection (mount) not a per socket
1333 or per-smb connection option in the protocol */
1334 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1335 vol->seal = 1;
1336 } else if (strnicmp(data, "direct", 6) == 0) {
1337 vol->direct_io = 1;
1338 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1339 vol->direct_io = 1;
1340 } else if (strnicmp(data, "noac", 4) == 0) {
1341 printk(KERN_WARNING "CIFS: Mount option noac not "
1342 "supported. Instead set "
1343 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1344 } else if (strnicmp(data, "fsc", 3) == 0) {
1345 vol->fsc = true;
1346 } else
1347 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1348 data);
1349 }
1350 if (vol->UNC == NULL) {
1351 if (devname == NULL) {
1352 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1353 "target\n");
1354 return 1;
1355 }
1356 if ((temp_len = strnlen(devname, 300)) < 300) {
1357 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1358 if (vol->UNC == NULL)
1359 return 1;
1360 strcpy(vol->UNC, devname);
1361 if (strncmp(vol->UNC, "//", 2) == 0) {
1362 vol->UNC[0] = '\\';
1363 vol->UNC[1] = '\\';
1364 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1365 printk(KERN_WARNING "CIFS: UNC Path does not "
1366 "begin with // or \\\\ \n");
1367 return 1;
1368 }
1369 value = strpbrk(vol->UNC+2, "/\\");
1370 if (value)
1371 *value = '\\';
1372 } else {
1373 printk(KERN_WARNING "CIFS: UNC name too long\n");
1374 return 1;
1375 }
1376 }
1377 if (vol->UNCip == NULL)
1378 vol->UNCip = &vol->UNC[2];
1379
1380 if (uid_specified)
1381 vol->override_uid = override_uid;
1382 else if (override_uid == 1)
1383 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1384 "specified with no uid= option.\n");
1385
1386 if (gid_specified)
1387 vol->override_gid = override_gid;
1388 else if (override_gid == 1)
1389 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1390 "specified with no gid= option.\n");
1391
1392 return 0;
1393 }
1394
1395 static bool
1396 match_address(struct TCP_Server_Info *server, struct sockaddr *addr)
1397 {
1398 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1399 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1400
1401 switch (addr->sa_family) {
1402 case AF_INET:
1403 if (addr4->sin_addr.s_addr !=
1404 server->addr.sockAddr.sin_addr.s_addr)
1405 return false;
1406 if (addr4->sin_port &&
1407 addr4->sin_port != server->addr.sockAddr.sin_port)
1408 return false;
1409 break;
1410 case AF_INET6:
1411 if (!ipv6_addr_equal(&addr6->sin6_addr,
1412 &server->addr.sockAddr6.sin6_addr))
1413 return false;
1414 if (addr6->sin6_scope_id !=
1415 server->addr.sockAddr6.sin6_scope_id)
1416 return false;
1417 if (addr6->sin6_port &&
1418 addr6->sin6_port != server->addr.sockAddr6.sin6_port)
1419 return false;
1420 break;
1421 }
1422
1423 return true;
1424 }
1425
1426 static bool
1427 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1428 {
1429 unsigned int secFlags;
1430
1431 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1432 secFlags = vol->secFlg;
1433 else
1434 secFlags = global_secflags | vol->secFlg;
1435
1436 switch (server->secType) {
1437 case LANMAN:
1438 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1439 return false;
1440 break;
1441 case NTLMv2:
1442 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1443 return false;
1444 break;
1445 case NTLM:
1446 if (!(secFlags & CIFSSEC_MAY_NTLM))
1447 return false;
1448 break;
1449 case Kerberos:
1450 if (!(secFlags & CIFSSEC_MAY_KRB5))
1451 return false;
1452 break;
1453 case RawNTLMSSP:
1454 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1455 return false;
1456 break;
1457 default:
1458 /* shouldn't happen */
1459 return false;
1460 }
1461
1462 /* now check if signing mode is acceptible */
1463 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1464 (server->secMode & SECMODE_SIGN_REQUIRED))
1465 return false;
1466 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1467 (server->secMode &
1468 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1469 return false;
1470
1471 return true;
1472 }
1473
1474 static struct TCP_Server_Info *
1475 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1476 {
1477 struct TCP_Server_Info *server;
1478
1479 write_lock(&cifs_tcp_ses_lock);
1480 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1481 /*
1482 * the demux thread can exit on its own while still in CifsNew
1483 * so don't accept any sockets in that state. Since the
1484 * tcpStatus never changes back to CifsNew it's safe to check
1485 * for this without a lock.
1486 */
1487 if (server->tcpStatus == CifsNew)
1488 continue;
1489
1490 if (!match_address(server, addr))
1491 continue;
1492
1493 if (!match_security(server, vol))
1494 continue;
1495
1496 ++server->srv_count;
1497 write_unlock(&cifs_tcp_ses_lock);
1498 cFYI(1, "Existing tcp session with server found");
1499 return server;
1500 }
1501 write_unlock(&cifs_tcp_ses_lock);
1502 return NULL;
1503 }
1504
1505 static void
1506 cifs_put_tcp_session(struct TCP_Server_Info *server)
1507 {
1508 struct task_struct *task;
1509
1510 write_lock(&cifs_tcp_ses_lock);
1511 if (--server->srv_count > 0) {
1512 write_unlock(&cifs_tcp_ses_lock);
1513 return;
1514 }
1515
1516 list_del_init(&server->tcp_ses_list);
1517 write_unlock(&cifs_tcp_ses_lock);
1518
1519 spin_lock(&GlobalMid_Lock);
1520 server->tcpStatus = CifsExiting;
1521 spin_unlock(&GlobalMid_Lock);
1522
1523 cifs_fscache_release_client_cookie(server);
1524
1525 task = xchg(&server->tsk, NULL);
1526 if (task)
1527 force_sig(SIGKILL, task);
1528 }
1529
1530 static struct TCP_Server_Info *
1531 cifs_get_tcp_session(struct smb_vol *volume_info)
1532 {
1533 struct TCP_Server_Info *tcp_ses = NULL;
1534 struct sockaddr_storage addr;
1535 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1536 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1537 int rc;
1538
1539 memset(&addr, 0, sizeof(struct sockaddr_storage));
1540
1541 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1542
1543 if (volume_info->UNCip && volume_info->UNC) {
1544 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1545 volume_info->UNCip,
1546 strlen(volume_info->UNCip),
1547 volume_info->port);
1548 if (!rc) {
1549 /* we failed translating address */
1550 rc = -EINVAL;
1551 goto out_err;
1552 }
1553 } else if (volume_info->UNCip) {
1554 /* BB using ip addr as tcp_ses name to connect to the
1555 DFS root below */
1556 cERROR(1, "Connecting to DFS root not implemented yet");
1557 rc = -EINVAL;
1558 goto out_err;
1559 } else /* which tcp_sess DFS root would we conect to */ {
1560 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1561 "unc=//192.168.1.100/public) specified");
1562 rc = -EINVAL;
1563 goto out_err;
1564 }
1565
1566 /* see if we already have a matching tcp_ses */
1567 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1568 if (tcp_ses)
1569 return tcp_ses;
1570
1571 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1572 if (!tcp_ses) {
1573 rc = -ENOMEM;
1574 goto out_err;
1575 }
1576
1577 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1578 if (IS_ERR(tcp_ses->hostname)) {
1579 rc = PTR_ERR(tcp_ses->hostname);
1580 goto out_err;
1581 }
1582
1583 tcp_ses->noblocksnd = volume_info->noblocksnd;
1584 tcp_ses->noautotune = volume_info->noautotune;
1585 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1586 atomic_set(&tcp_ses->inFlight, 0);
1587 init_waitqueue_head(&tcp_ses->response_q);
1588 init_waitqueue_head(&tcp_ses->request_q);
1589 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1590 mutex_init(&tcp_ses->srv_mutex);
1591 memcpy(tcp_ses->workstation_RFC1001_name,
1592 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1593 memcpy(tcp_ses->server_RFC1001_name,
1594 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1595 tcp_ses->sequence_number = 0;
1596 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1597 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1598
1599 /*
1600 * at this point we are the only ones with the pointer
1601 * to the struct since the kernel thread not created yet
1602 * no need to spinlock this init of tcpStatus or srv_count
1603 */
1604 tcp_ses->tcpStatus = CifsNew;
1605 ++tcp_ses->srv_count;
1606
1607 if (addr.ss_family == AF_INET6) {
1608 cFYI(1, "attempting ipv6 connect");
1609 /* BB should we allow ipv6 on port 139? */
1610 /* other OS never observed in Wild doing 139 with v6 */
1611 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1612 sizeof(struct sockaddr_in6));
1613 rc = ipv6_connect(tcp_ses);
1614 } else {
1615 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1616 sizeof(struct sockaddr_in));
1617 rc = ipv4_connect(tcp_ses);
1618 }
1619 if (rc < 0) {
1620 cERROR(1, "Error connecting to socket. Aborting operation");
1621 goto out_err;
1622 }
1623
1624 /*
1625 * since we're in a cifs function already, we know that
1626 * this will succeed. No need for try_module_get().
1627 */
1628 __module_get(THIS_MODULE);
1629 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1630 tcp_ses, "cifsd");
1631 if (IS_ERR(tcp_ses->tsk)) {
1632 rc = PTR_ERR(tcp_ses->tsk);
1633 cERROR(1, "error %d create cifsd thread", rc);
1634 module_put(THIS_MODULE);
1635 goto out_err;
1636 }
1637
1638 /* thread spawned, put it on the list */
1639 write_lock(&cifs_tcp_ses_lock);
1640 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1641 write_unlock(&cifs_tcp_ses_lock);
1642
1643 cifs_fscache_get_client_cookie(tcp_ses);
1644
1645 return tcp_ses;
1646
1647 out_err:
1648 if (tcp_ses) {
1649 if (!IS_ERR(tcp_ses->hostname))
1650 kfree(tcp_ses->hostname);
1651 if (tcp_ses->ssocket)
1652 sock_release(tcp_ses->ssocket);
1653 kfree(tcp_ses);
1654 }
1655 return ERR_PTR(rc);
1656 }
1657
1658 static struct cifsSesInfo *
1659 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
1660 {
1661 struct cifsSesInfo *ses;
1662
1663 write_lock(&cifs_tcp_ses_lock);
1664 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1665 switch (server->secType) {
1666 case Kerberos:
1667 if (vol->cred_uid != ses->cred_uid)
1668 continue;
1669 break;
1670 default:
1671 /* anything else takes username/password */
1672 if (strncmp(ses->userName, vol->username,
1673 MAX_USERNAME_SIZE))
1674 continue;
1675 if (strlen(vol->username) != 0 &&
1676 ses->password != NULL &&
1677 strncmp(ses->password,
1678 vol->password ? vol->password : "",
1679 MAX_PASSWORD_SIZE))
1680 continue;
1681 }
1682 ++ses->ses_count;
1683 write_unlock(&cifs_tcp_ses_lock);
1684 return ses;
1685 }
1686 write_unlock(&cifs_tcp_ses_lock);
1687 return NULL;
1688 }
1689
1690 static void
1691 cifs_put_smb_ses(struct cifsSesInfo *ses)
1692 {
1693 int xid;
1694 struct TCP_Server_Info *server = ses->server;
1695
1696 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1697 write_lock(&cifs_tcp_ses_lock);
1698 if (--ses->ses_count > 0) {
1699 write_unlock(&cifs_tcp_ses_lock);
1700 return;
1701 }
1702
1703 list_del_init(&ses->smb_ses_list);
1704 write_unlock(&cifs_tcp_ses_lock);
1705
1706 if (ses->status == CifsGood) {
1707 xid = GetXid();
1708 CIFSSMBLogoff(xid, ses);
1709 _FreeXid(xid);
1710 }
1711 cifs_crypto_shash_release(server);
1712 sesInfoFree(ses);
1713 cifs_put_tcp_session(server);
1714 }
1715
1716 static struct cifsSesInfo *
1717 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1718 {
1719 int rc = -ENOMEM, xid;
1720 struct cifsSesInfo *ses;
1721
1722 xid = GetXid();
1723
1724 ses = cifs_find_smb_ses(server, volume_info);
1725 if (ses) {
1726 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1727
1728 /* existing SMB ses has a server reference already */
1729 cifs_put_tcp_session(server);
1730
1731 mutex_lock(&ses->session_mutex);
1732 rc = cifs_negotiate_protocol(xid, ses);
1733 if (rc) {
1734 mutex_unlock(&ses->session_mutex);
1735 /* problem -- put our ses reference */
1736 cifs_put_smb_ses(ses);
1737 FreeXid(xid);
1738 return ERR_PTR(rc);
1739 }
1740 if (ses->need_reconnect) {
1741 cFYI(1, "Session needs reconnect");
1742 rc = cifs_setup_session(xid, ses,
1743 volume_info->local_nls);
1744 if (rc) {
1745 mutex_unlock(&ses->session_mutex);
1746 /* problem -- put our reference */
1747 cifs_put_smb_ses(ses);
1748 FreeXid(xid);
1749 return ERR_PTR(rc);
1750 }
1751 }
1752 mutex_unlock(&ses->session_mutex);
1753 FreeXid(xid);
1754 return ses;
1755 }
1756
1757 cFYI(1, "Existing smb sess not found");
1758 ses = sesInfoAlloc();
1759 if (ses == NULL)
1760 goto get_ses_fail;
1761
1762 /* new SMB session uses our server ref */
1763 ses->server = server;
1764 if (server->addr.sockAddr6.sin6_family == AF_INET6)
1765 sprintf(ses->serverName, "%pI6",
1766 &server->addr.sockAddr6.sin6_addr);
1767 else
1768 sprintf(ses->serverName, "%pI4",
1769 &server->addr.sockAddr.sin_addr.s_addr);
1770
1771 if (volume_info->username)
1772 strncpy(ses->userName, volume_info->username,
1773 MAX_USERNAME_SIZE);
1774
1775 /* volume_info->password freed at unmount */
1776 if (volume_info->password) {
1777 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1778 if (!ses->password)
1779 goto get_ses_fail;
1780 }
1781 if (volume_info->domainname) {
1782 int len = strlen(volume_info->domainname);
1783 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1784 if (ses->domainName)
1785 strcpy(ses->domainName, volume_info->domainname);
1786 }
1787 ses->cred_uid = volume_info->cred_uid;
1788 ses->linux_uid = volume_info->linux_uid;
1789 ses->overrideSecFlg = volume_info->secFlg;
1790
1791 rc = cifs_crypto_shash_allocate(server);
1792 if (rc) {
1793 cERROR(1, "could not setup hash structures rc %d", rc);
1794 goto get_ses_fail;
1795 }
1796 server->tilen = 0;
1797 server->tiblob = NULL;
1798
1799 mutex_lock(&ses->session_mutex);
1800 rc = cifs_negotiate_protocol(xid, ses);
1801 if (!rc)
1802 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1803 mutex_unlock(&ses->session_mutex);
1804 if (rc) {
1805 cifs_crypto_shash_release(ses->server);
1806 goto get_ses_fail;
1807 }
1808
1809 /* success, put it on the list */
1810 write_lock(&cifs_tcp_ses_lock);
1811 list_add(&ses->smb_ses_list, &server->smb_ses_list);
1812 write_unlock(&cifs_tcp_ses_lock);
1813
1814 FreeXid(xid);
1815 return ses;
1816
1817 get_ses_fail:
1818 sesInfoFree(ses);
1819 FreeXid(xid);
1820 return ERR_PTR(rc);
1821 }
1822
1823 static struct cifsTconInfo *
1824 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1825 {
1826 struct list_head *tmp;
1827 struct cifsTconInfo *tcon;
1828
1829 write_lock(&cifs_tcp_ses_lock);
1830 list_for_each(tmp, &ses->tcon_list) {
1831 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1832 if (tcon->tidStatus == CifsExiting)
1833 continue;
1834 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1835 continue;
1836
1837 ++tcon->tc_count;
1838 write_unlock(&cifs_tcp_ses_lock);
1839 return tcon;
1840 }
1841 write_unlock(&cifs_tcp_ses_lock);
1842 return NULL;
1843 }
1844
1845 static void
1846 cifs_put_tcon(struct cifsTconInfo *tcon)
1847 {
1848 int xid;
1849 struct cifsSesInfo *ses = tcon->ses;
1850
1851 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
1852 write_lock(&cifs_tcp_ses_lock);
1853 if (--tcon->tc_count > 0) {
1854 write_unlock(&cifs_tcp_ses_lock);
1855 return;
1856 }
1857
1858 list_del_init(&tcon->tcon_list);
1859 write_unlock(&cifs_tcp_ses_lock);
1860
1861 xid = GetXid();
1862 CIFSSMBTDis(xid, tcon);
1863 _FreeXid(xid);
1864
1865 cifs_fscache_release_super_cookie(tcon);
1866 tconInfoFree(tcon);
1867 cifs_put_smb_ses(ses);
1868 }
1869
1870 static struct cifsTconInfo *
1871 cifs_get_tcon(struct cifsSesInfo *ses, struct smb_vol *volume_info)
1872 {
1873 int rc, xid;
1874 struct cifsTconInfo *tcon;
1875
1876 tcon = cifs_find_tcon(ses, volume_info->UNC);
1877 if (tcon) {
1878 cFYI(1, "Found match on UNC path");
1879 /* existing tcon already has a reference */
1880 cifs_put_smb_ses(ses);
1881 if (tcon->seal != volume_info->seal)
1882 cERROR(1, "transport encryption setting "
1883 "conflicts with existing tid");
1884 return tcon;
1885 }
1886
1887 tcon = tconInfoAlloc();
1888 if (tcon == NULL) {
1889 rc = -ENOMEM;
1890 goto out_fail;
1891 }
1892
1893 tcon->ses = ses;
1894 if (volume_info->password) {
1895 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
1896 if (!tcon->password) {
1897 rc = -ENOMEM;
1898 goto out_fail;
1899 }
1900 }
1901
1902 if (strchr(volume_info->UNC + 3, '\\') == NULL
1903 && strchr(volume_info->UNC + 3, '/') == NULL) {
1904 cERROR(1, "Missing share name");
1905 rc = -ENODEV;
1906 goto out_fail;
1907 }
1908
1909 /* BB Do we need to wrap session_mutex around
1910 * this TCon call and Unix SetFS as
1911 * we do on SessSetup and reconnect? */
1912 xid = GetXid();
1913 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
1914 FreeXid(xid);
1915 cFYI(1, "CIFS Tcon rc = %d", rc);
1916 if (rc)
1917 goto out_fail;
1918
1919 if (volume_info->nodfs) {
1920 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
1921 cFYI(1, "DFS disabled (%d)", tcon->Flags);
1922 }
1923 tcon->seal = volume_info->seal;
1924 /* we can have only one retry value for a connection
1925 to a share so for resources mounted more than once
1926 to the same server share the last value passed in
1927 for the retry flag is used */
1928 tcon->retry = volume_info->retry;
1929 tcon->nocase = volume_info->nocase;
1930 tcon->local_lease = volume_info->local_lease;
1931
1932 write_lock(&cifs_tcp_ses_lock);
1933 list_add(&tcon->tcon_list, &ses->tcon_list);
1934 write_unlock(&cifs_tcp_ses_lock);
1935
1936 cifs_fscache_get_super_cookie(tcon);
1937
1938 return tcon;
1939
1940 out_fail:
1941 tconInfoFree(tcon);
1942 return ERR_PTR(rc);
1943 }
1944
1945
1946 int
1947 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1948 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1949 struct dfs_info3_param **preferrals, int remap)
1950 {
1951 char *temp_unc;
1952 int rc = 0;
1953
1954 *pnum_referrals = 0;
1955 *preferrals = NULL;
1956
1957 if (pSesInfo->ipc_tid == 0) {
1958 temp_unc = kmalloc(2 /* for slashes */ +
1959 strnlen(pSesInfo->serverName,
1960 SERVER_NAME_LEN_WITH_NULL * 2)
1961 + 1 + 4 /* slash IPC$ */ + 2,
1962 GFP_KERNEL);
1963 if (temp_unc == NULL)
1964 return -ENOMEM;
1965 temp_unc[0] = '\\';
1966 temp_unc[1] = '\\';
1967 strcpy(temp_unc + 2, pSesInfo->serverName);
1968 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1969 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1970 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1971 kfree(temp_unc);
1972 }
1973 if (rc == 0)
1974 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1975 pnum_referrals, nls_codepage, remap);
1976 /* BB map targetUNCs to dfs_info3 structures, here or
1977 in CIFSGetDFSRefer BB */
1978
1979 return rc;
1980 }
1981
1982 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1983 static struct lock_class_key cifs_key[2];
1984 static struct lock_class_key cifs_slock_key[2];
1985
1986 static inline void
1987 cifs_reclassify_socket4(struct socket *sock)
1988 {
1989 struct sock *sk = sock->sk;
1990 BUG_ON(sock_owned_by_user(sk));
1991 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1992 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1993 }
1994
1995 static inline void
1996 cifs_reclassify_socket6(struct socket *sock)
1997 {
1998 struct sock *sk = sock->sk;
1999 BUG_ON(sock_owned_by_user(sk));
2000 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2001 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2002 }
2003 #else
2004 static inline void
2005 cifs_reclassify_socket4(struct socket *sock)
2006 {
2007 }
2008
2009 static inline void
2010 cifs_reclassify_socket6(struct socket *sock)
2011 {
2012 }
2013 #endif
2014
2015 /* See RFC1001 section 14 on representation of Netbios names */
2016 static void rfc1002mangle(char *target, char *source, unsigned int length)
2017 {
2018 unsigned int i, j;
2019
2020 for (i = 0, j = 0; i < (length); i++) {
2021 /* mask a nibble at a time and encode */
2022 target[j] = 'A' + (0x0F & (source[i] >> 4));
2023 target[j+1] = 'A' + (0x0F & source[i]);
2024 j += 2;
2025 }
2026
2027 }
2028
2029
2030 static int
2031 ipv4_connect(struct TCP_Server_Info *server)
2032 {
2033 int rc = 0;
2034 int val;
2035 bool connected = false;
2036 __be16 orig_port = 0;
2037 struct socket *socket = server->ssocket;
2038
2039 if (socket == NULL) {
2040 rc = sock_create_kern(PF_INET, SOCK_STREAM,
2041 IPPROTO_TCP, &socket);
2042 if (rc < 0) {
2043 cERROR(1, "Error %d creating socket", rc);
2044 return rc;
2045 }
2046
2047 /* BB other socket options to set KEEPALIVE, NODELAY? */
2048 cFYI(1, "Socket created");
2049 server->ssocket = socket;
2050 socket->sk->sk_allocation = GFP_NOFS;
2051 cifs_reclassify_socket4(socket);
2052 }
2053
2054 /* user overrode default port */
2055 if (server->addr.sockAddr.sin_port) {
2056 rc = socket->ops->connect(socket, (struct sockaddr *)
2057 &server->addr.sockAddr,
2058 sizeof(struct sockaddr_in), 0);
2059 if (rc >= 0)
2060 connected = true;
2061 }
2062
2063 if (!connected) {
2064 /* save original port so we can retry user specified port
2065 later if fall back ports fail this time */
2066 orig_port = server->addr.sockAddr.sin_port;
2067
2068 /* do not retry on the same port we just failed on */
2069 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
2070 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
2071 rc = socket->ops->connect(socket,
2072 (struct sockaddr *)
2073 &server->addr.sockAddr,
2074 sizeof(struct sockaddr_in), 0);
2075 if (rc >= 0)
2076 connected = true;
2077 }
2078 }
2079 if (!connected) {
2080 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
2081 rc = socket->ops->connect(socket, (struct sockaddr *)
2082 &server->addr.sockAddr,
2083 sizeof(struct sockaddr_in), 0);
2084 if (rc >= 0)
2085 connected = true;
2086 }
2087
2088 /* give up here - unless we want to retry on different
2089 protocol families some day */
2090 if (!connected) {
2091 if (orig_port)
2092 server->addr.sockAddr.sin_port = orig_port;
2093 cFYI(1, "Error %d connecting to server via ipv4", rc);
2094 sock_release(socket);
2095 server->ssocket = NULL;
2096 return rc;
2097 }
2098
2099
2100 /*
2101 * Eventually check for other socket options to change from
2102 * the default. sock_setsockopt not used because it expects
2103 * user space buffer
2104 */
2105 socket->sk->sk_rcvtimeo = 7 * HZ;
2106 socket->sk->sk_sndtimeo = 5 * HZ;
2107
2108 /* make the bufsizes depend on wsize/rsize and max requests */
2109 if (server->noautotune) {
2110 if (socket->sk->sk_sndbuf < (200 * 1024))
2111 socket->sk->sk_sndbuf = 200 * 1024;
2112 if (socket->sk->sk_rcvbuf < (140 * 1024))
2113 socket->sk->sk_rcvbuf = 140 * 1024;
2114 }
2115
2116 if (server->tcp_nodelay) {
2117 val = 1;
2118 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2119 (char *)&val, sizeof(val));
2120 if (rc)
2121 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2122 }
2123
2124 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2125 socket->sk->sk_sndbuf,
2126 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2127
2128 /* send RFC1001 sessinit */
2129 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
2130 /* some servers require RFC1001 sessinit before sending
2131 negprot - BB check reconnection in case where second
2132 sessinit is sent but no second negprot */
2133 struct rfc1002_session_packet *ses_init_buf;
2134 struct smb_hdr *smb_buf;
2135 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2136 GFP_KERNEL);
2137 if (ses_init_buf) {
2138 ses_init_buf->trailer.session_req.called_len = 32;
2139 if (server->server_RFC1001_name &&
2140 server->server_RFC1001_name[0] != 0)
2141 rfc1002mangle(ses_init_buf->trailer.
2142 session_req.called_name,
2143 server->server_RFC1001_name,
2144 RFC1001_NAME_LEN_WITH_NULL);
2145 else
2146 rfc1002mangle(ses_init_buf->trailer.
2147 session_req.called_name,
2148 DEFAULT_CIFS_CALLED_NAME,
2149 RFC1001_NAME_LEN_WITH_NULL);
2150
2151 ses_init_buf->trailer.session_req.calling_len = 32;
2152
2153 /* calling name ends in null (byte 16) from old smb
2154 convention. */
2155 if (server->workstation_RFC1001_name &&
2156 server->workstation_RFC1001_name[0] != 0)
2157 rfc1002mangle(ses_init_buf->trailer.
2158 session_req.calling_name,
2159 server->workstation_RFC1001_name,
2160 RFC1001_NAME_LEN_WITH_NULL);
2161 else
2162 rfc1002mangle(ses_init_buf->trailer.
2163 session_req.calling_name,
2164 "LINUX_CIFS_CLNT",
2165 RFC1001_NAME_LEN_WITH_NULL);
2166
2167 ses_init_buf->trailer.session_req.scope1 = 0;
2168 ses_init_buf->trailer.session_req.scope2 = 0;
2169 smb_buf = (struct smb_hdr *)ses_init_buf;
2170 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2171 smb_buf->smb_buf_length = 0x81000044;
2172 rc = smb_send(server, smb_buf, 0x44);
2173 kfree(ses_init_buf);
2174 msleep(1); /* RFC1001 layer in at least one server
2175 requires very short break before negprot
2176 presumably because not expecting negprot
2177 to follow so fast. This is a simple
2178 solution that works without
2179 complicating the code and causes no
2180 significant slowing down on mount
2181 for everyone else */
2182 }
2183 /* else the negprot may still work without this
2184 even though malloc failed */
2185
2186 }
2187
2188 return rc;
2189 }
2190
2191 static int
2192 ipv6_connect(struct TCP_Server_Info *server)
2193 {
2194 int rc = 0;
2195 int val;
2196 bool connected = false;
2197 __be16 orig_port = 0;
2198 struct socket *socket = server->ssocket;
2199
2200 if (socket == NULL) {
2201 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2202 IPPROTO_TCP, &socket);
2203 if (rc < 0) {
2204 cERROR(1, "Error %d creating ipv6 socket", rc);
2205 socket = NULL;
2206 return rc;
2207 }
2208
2209 /* BB other socket options to set KEEPALIVE, NODELAY? */
2210 cFYI(1, "ipv6 Socket created");
2211 server->ssocket = socket;
2212 socket->sk->sk_allocation = GFP_NOFS;
2213 cifs_reclassify_socket6(socket);
2214 }
2215
2216 /* user overrode default port */
2217 if (server->addr.sockAddr6.sin6_port) {
2218 rc = socket->ops->connect(socket,
2219 (struct sockaddr *) &server->addr.sockAddr6,
2220 sizeof(struct sockaddr_in6), 0);
2221 if (rc >= 0)
2222 connected = true;
2223 }
2224
2225 if (!connected) {
2226 /* save original port so we can retry user specified port
2227 later if fall back ports fail this time */
2228
2229 orig_port = server->addr.sockAddr6.sin6_port;
2230 /* do not retry on the same port we just failed on */
2231 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2232 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2233 rc = socket->ops->connect(socket, (struct sockaddr *)
2234 &server->addr.sockAddr6,
2235 sizeof(struct sockaddr_in6), 0);
2236 if (rc >= 0)
2237 connected = true;
2238 }
2239 }
2240 if (!connected) {
2241 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2242 rc = socket->ops->connect(socket, (struct sockaddr *)
2243 &server->addr.sockAddr6,
2244 sizeof(struct sockaddr_in6), 0);
2245 if (rc >= 0)
2246 connected = true;
2247 }
2248
2249 /* give up here - unless we want to retry on different
2250 protocol families some day */
2251 if (!connected) {
2252 if (orig_port)
2253 server->addr.sockAddr6.sin6_port = orig_port;
2254 cFYI(1, "Error %d connecting to server via ipv6", rc);
2255 sock_release(socket);
2256 server->ssocket = NULL;
2257 return rc;
2258 }
2259
2260 /*
2261 * Eventually check for other socket options to change from
2262 * the default. sock_setsockopt not used because it expects
2263 * user space buffer
2264 */
2265 socket->sk->sk_rcvtimeo = 7 * HZ;
2266 socket->sk->sk_sndtimeo = 5 * HZ;
2267
2268 if (server->tcp_nodelay) {
2269 val = 1;
2270 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2271 (char *)&val, sizeof(val));
2272 if (rc)
2273 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2274 }
2275
2276 server->ssocket = socket;
2277
2278 return rc;
2279 }
2280
2281 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2282 struct super_block *sb, struct smb_vol *vol_info)
2283 {
2284 /* if we are reconnecting then should we check to see if
2285 * any requested capabilities changed locally e.g. via
2286 * remount but we can not do much about it here
2287 * if they have (even if we could detect it by the following)
2288 * Perhaps we could add a backpointer to array of sb from tcon
2289 * or if we change to make all sb to same share the same
2290 * sb as NFS - then we only have one backpointer to sb.
2291 * What if we wanted to mount the server share twice once with
2292 * and once without posixacls or posix paths? */
2293 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2294
2295 if (vol_info && vol_info->no_linux_ext) {
2296 tcon->fsUnixInfo.Capability = 0;
2297 tcon->unix_ext = 0; /* Unix Extensions disabled */
2298 cFYI(1, "Linux protocol extensions disabled");
2299 return;
2300 } else if (vol_info)
2301 tcon->unix_ext = 1; /* Unix Extensions supported */
2302
2303 if (tcon->unix_ext == 0) {
2304 cFYI(1, "Unix extensions disabled so not set on reconnect");
2305 return;
2306 }
2307
2308 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2309 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2310
2311 /* check for reconnect case in which we do not
2312 want to change the mount behavior if we can avoid it */
2313 if (vol_info == NULL) {
2314 /* turn off POSIX ACL and PATHNAMES if not set
2315 originally at mount time */
2316 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2317 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2318 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2319 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2320 cERROR(1, "POSIXPATH support change");
2321 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2322 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2323 cERROR(1, "possible reconnect error");
2324 cERROR(1, "server disabled POSIX path support");
2325 }
2326 }
2327
2328 cap &= CIFS_UNIX_CAP_MASK;
2329 if (vol_info && vol_info->no_psx_acl)
2330 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2331 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2332 cFYI(1, "negotiated posix acl support");
2333 if (sb)
2334 sb->s_flags |= MS_POSIXACL;
2335 }
2336
2337 if (vol_info && vol_info->posix_paths == 0)
2338 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2339 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2340 cFYI(1, "negotiate posix pathnames");
2341 if (sb)
2342 CIFS_SB(sb)->mnt_cifs_flags |=
2343 CIFS_MOUNT_POSIX_PATHS;
2344 }
2345
2346 /* We might be setting the path sep back to a different
2347 form if we are reconnecting and the server switched its
2348 posix path capability for this share */
2349 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2350 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2351
2352 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2353 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2354 CIFS_SB(sb)->rsize = 127 * 1024;
2355 cFYI(DBG2, "larger reads not supported by srv");
2356 }
2357 }
2358
2359
2360 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2361 #ifdef CONFIG_CIFS_DEBUG2
2362 if (cap & CIFS_UNIX_FCNTL_CAP)
2363 cFYI(1, "FCNTL cap");
2364 if (cap & CIFS_UNIX_EXTATTR_CAP)
2365 cFYI(1, "EXTATTR cap");
2366 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2367 cFYI(1, "POSIX path cap");
2368 if (cap & CIFS_UNIX_XATTR_CAP)
2369 cFYI(1, "XATTR cap");
2370 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2371 cFYI(1, "POSIX ACL cap");
2372 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2373 cFYI(1, "very large read cap");
2374 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2375 cFYI(1, "very large write cap");
2376 #endif /* CIFS_DEBUG2 */
2377 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2378 if (vol_info == NULL) {
2379 cFYI(1, "resetting capabilities failed");
2380 } else
2381 cERROR(1, "Negotiating Unix capabilities "
2382 "with the server failed. Consider "
2383 "mounting with the Unix Extensions\n"
2384 "disabled, if problems are found, "
2385 "by specifying the nounix mount "
2386 "option.");
2387
2388 }
2389 }
2390 }
2391
2392 static void
2393 convert_delimiter(char *path, char delim)
2394 {
2395 int i;
2396 char old_delim;
2397
2398 if (path == NULL)
2399 return;
2400
2401 if (delim == '/')
2402 old_delim = '\\';
2403 else
2404 old_delim = '/';
2405
2406 for (i = 0; path[i] != '\0'; i++) {
2407 if (path[i] == old_delim)
2408 path[i] = delim;
2409 }
2410 }
2411
2412 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2413 struct cifs_sb_info *cifs_sb)
2414 {
2415 if (pvolume_info->rsize > CIFSMaxBufSize) {
2416 cERROR(1, "rsize %d too large, using MaxBufSize",
2417 pvolume_info->rsize);
2418 cifs_sb->rsize = CIFSMaxBufSize;
2419 } else if ((pvolume_info->rsize) &&
2420 (pvolume_info->rsize <= CIFSMaxBufSize))
2421 cifs_sb->rsize = pvolume_info->rsize;
2422 else /* default */
2423 cifs_sb->rsize = CIFSMaxBufSize;
2424
2425 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2426 cERROR(1, "wsize %d too large, using 4096 instead",
2427 pvolume_info->wsize);
2428 cifs_sb->wsize = 4096;
2429 } else if (pvolume_info->wsize)
2430 cifs_sb->wsize = pvolume_info->wsize;
2431 else
2432 cifs_sb->wsize = min_t(const int,
2433 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2434 127*1024);
2435 /* old default of CIFSMaxBufSize was too small now
2436 that SMB Write2 can send multiple pages in kvec.
2437 RFC1001 does not describe what happens when frame
2438 bigger than 128K is sent so use that as max in
2439 conjunction with 52K kvec constraint on arch with 4K
2440 page size */
2441
2442 if (cifs_sb->rsize < 2048) {
2443 cifs_sb->rsize = 2048;
2444 /* Windows ME may prefer this */
2445 cFYI(1, "readsize set to minimum: 2048");
2446 }
2447 /* calculate prepath */
2448 cifs_sb->prepath = pvolume_info->prepath;
2449 if (cifs_sb->prepath) {
2450 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2451 /* we can not convert the / to \ in the path
2452 separators in the prefixpath yet because we do not
2453 know (until reset_cifs_unix_caps is called later)
2454 whether POSIX PATH CAP is available. We normalize
2455 the / to \ after reset_cifs_unix_caps is called */
2456 pvolume_info->prepath = NULL;
2457 } else
2458 cifs_sb->prepathlen = 0;
2459 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2460 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2461 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2462 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2463 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2464 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2465
2466 if (pvolume_info->noperm)
2467 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2468 if (pvolume_info->setuids)
2469 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2470 if (pvolume_info->server_ino)
2471 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2472 if (pvolume_info->remap)
2473 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2474 if (pvolume_info->no_xattr)
2475 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2476 if (pvolume_info->sfu_emul)
2477 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2478 if (pvolume_info->nobrl)
2479 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2480 if (pvolume_info->nostrictsync)
2481 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2482 if (pvolume_info->mand_lock)
2483 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2484 if (pvolume_info->cifs_acl)
2485 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2486 if (pvolume_info->override_uid)
2487 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2488 if (pvolume_info->override_gid)
2489 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2490 if (pvolume_info->dynperm)
2491 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2492 if (pvolume_info->fsc)
2493 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2494 if (pvolume_info->direct_io) {
2495 cFYI(1, "mounting share using direct i/o");
2496 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2497 }
2498
2499 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2500 cERROR(1, "mount option dynperm ignored if cifsacl "
2501 "mount option supported");
2502 }
2503
2504 static int
2505 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2506 struct cifs_sb_info *cifs_sb, const char *full_path)
2507 {
2508 int rc;
2509 FILE_ALL_INFO *pfile_info;
2510
2511 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2512 if (pfile_info == NULL)
2513 return -ENOMEM;
2514
2515 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2516 0 /* not legacy */, cifs_sb->local_nls,
2517 cifs_sb->mnt_cifs_flags &
2518 CIFS_MOUNT_MAP_SPECIAL_CHR);
2519 kfree(pfile_info);
2520 return rc;
2521 }
2522
2523 static void
2524 cleanup_volume_info(struct smb_vol **pvolume_info)
2525 {
2526 struct smb_vol *volume_info;
2527
2528 if (!pvolume_info || !*pvolume_info)
2529 return;
2530
2531 volume_info = *pvolume_info;
2532 kzfree(volume_info->password);
2533 kfree(volume_info->UNC);
2534 kfree(volume_info->prepath);
2535 kfree(volume_info);
2536 *pvolume_info = NULL;
2537 return;
2538 }
2539
2540 #ifdef CONFIG_CIFS_DFS_UPCALL
2541 /* build_path_to_root returns full path to root when
2542 * we do not have an exiting connection (tcon) */
2543 static char *
2544 build_unc_path_to_root(const struct smb_vol *volume_info,
2545 const struct cifs_sb_info *cifs_sb)
2546 {
2547 char *full_path;
2548
2549 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2550 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2551 if (full_path == NULL)
2552 return ERR_PTR(-ENOMEM);
2553
2554 strncpy(full_path, volume_info->UNC, unc_len);
2555 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2556 int i;
2557 for (i = 0; i < unc_len; i++) {
2558 if (full_path[i] == '\\')
2559 full_path[i] = '/';
2560 }
2561 }
2562
2563 if (cifs_sb->prepathlen)
2564 strncpy(full_path + unc_len, cifs_sb->prepath,
2565 cifs_sb->prepathlen);
2566
2567 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2568 return full_path;
2569 }
2570 #endif
2571
2572 int
2573 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2574 char *mount_data_global, const char *devname)
2575 {
2576 int rc;
2577 int xid;
2578 struct smb_vol *volume_info;
2579 struct cifsSesInfo *pSesInfo;
2580 struct cifsTconInfo *tcon;
2581 struct TCP_Server_Info *srvTcp;
2582 char *full_path;
2583 char *mount_data = mount_data_global;
2584 #ifdef CONFIG_CIFS_DFS_UPCALL
2585 struct dfs_info3_param *referrals = NULL;
2586 unsigned int num_referrals = 0;
2587 int referral_walks_count = 0;
2588 try_mount_again:
2589 #endif
2590 rc = 0;
2591 tcon = NULL;
2592 pSesInfo = NULL;
2593 srvTcp = NULL;
2594 full_path = NULL;
2595
2596 xid = GetXid();
2597
2598 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2599 if (!volume_info) {
2600 rc = -ENOMEM;
2601 goto out;
2602 }
2603
2604 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2605 rc = -EINVAL;
2606 goto out;
2607 }
2608
2609 if (volume_info->nullauth) {
2610 cFYI(1, "null user");
2611 volume_info->username = "";
2612 } else if (volume_info->username) {
2613 /* BB fixme parse for domain name here */
2614 cFYI(1, "Username: %s", volume_info->username);
2615 } else {
2616 cifserror("No username specified");
2617 /* In userspace mount helper we can get user name from alternate
2618 locations such as env variables and files on disk */
2619 rc = -EINVAL;
2620 goto out;
2621 }
2622
2623 /* this is needed for ASCII cp to Unicode converts */
2624 if (volume_info->iocharset == NULL) {
2625 /* load_nls_default cannot return null */
2626 volume_info->local_nls = load_nls_default();
2627 } else {
2628 volume_info->local_nls = load_nls(volume_info->iocharset);
2629 if (volume_info->local_nls == NULL) {
2630 cERROR(1, "CIFS mount error: iocharset %s not found",
2631 volume_info->iocharset);
2632 rc = -ELIBACC;
2633 goto out;
2634 }
2635 }
2636 cifs_sb->local_nls = volume_info->local_nls;
2637
2638 /* get a reference to a tcp session */
2639 srvTcp = cifs_get_tcp_session(volume_info);
2640 if (IS_ERR(srvTcp)) {
2641 rc = PTR_ERR(srvTcp);
2642 goto out;
2643 }
2644
2645 /* get a reference to a SMB session */
2646 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2647 if (IS_ERR(pSesInfo)) {
2648 rc = PTR_ERR(pSesInfo);
2649 pSesInfo = NULL;
2650 goto mount_fail_check;
2651 }
2652
2653 setup_cifs_sb(volume_info, cifs_sb);
2654 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2655 sb->s_maxbytes = MAX_LFS_FILESIZE;
2656 else
2657 sb->s_maxbytes = MAX_NON_LFS;
2658
2659 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2660 sb->s_time_gran = 100;
2661
2662 /* search for existing tcon to this server share */
2663 tcon = cifs_get_tcon(pSesInfo, volume_info);
2664 if (IS_ERR(tcon)) {
2665 rc = PTR_ERR(tcon);
2666 tcon = NULL;
2667 goto remote_path_check;
2668 }
2669
2670 cifs_sb->tcon = tcon;
2671
2672 /* do not care if following two calls succeed - informational */
2673 if (!tcon->ipc) {
2674 CIFSSMBQFSDeviceInfo(xid, tcon);
2675 CIFSSMBQFSAttributeInfo(xid, tcon);
2676 }
2677
2678 /* tell server which Unix caps we support */
2679 if (tcon->ses->capabilities & CAP_UNIX)
2680 /* reset of caps checks mount to see if unix extensions
2681 disabled for just this mount */
2682 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2683 else
2684 tcon->unix_ext = 0; /* server does not support them */
2685
2686 /* convert forward to back slashes in prepath here if needed */
2687 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2688 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2689
2690 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2691 cifs_sb->rsize = 1024 * 127;
2692 cFYI(DBG2, "no very large read support, rsize now 127K");
2693 }
2694 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2695 cifs_sb->wsize = min(cifs_sb->wsize,
2696 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2697 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2698 cifs_sb->rsize = min(cifs_sb->rsize,
2699 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2700
2701 remote_path_check:
2702 /* check if a whole path (including prepath) is not remote */
2703 if (!rc && cifs_sb->prepathlen && tcon) {
2704 /* build_path_to_root works only when we have a valid tcon */
2705 full_path = cifs_build_path_to_root(cifs_sb);
2706 if (full_path == NULL) {
2707 rc = -ENOMEM;
2708 goto mount_fail_check;
2709 }
2710 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2711 if (rc != -EREMOTE) {
2712 kfree(full_path);
2713 goto mount_fail_check;
2714 }
2715 kfree(full_path);
2716 }
2717
2718 /* get referral if needed */
2719 if (rc == -EREMOTE) {
2720 #ifdef CONFIG_CIFS_DFS_UPCALL
2721 if (referral_walks_count > MAX_NESTED_LINKS) {
2722 /*
2723 * BB: when we implement proper loop detection,
2724 * we will remove this check. But now we need it
2725 * to prevent an indefinite loop if 'DFS tree' is
2726 * misconfigured (i.e. has loops).
2727 */
2728 rc = -ELOOP;
2729 goto mount_fail_check;
2730 }
2731 /* convert forward to back slashes in prepath here if needed */
2732 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2733 convert_delimiter(cifs_sb->prepath,
2734 CIFS_DIR_SEP(cifs_sb));
2735 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2736 if (IS_ERR(full_path)) {
2737 rc = PTR_ERR(full_path);
2738 goto mount_fail_check;
2739 }
2740
2741 cFYI(1, "Getting referral for: %s", full_path);
2742 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2743 cifs_sb->local_nls, &num_referrals, &referrals,
2744 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2745 if (!rc && num_referrals > 0) {
2746 char *fake_devname = NULL;
2747
2748 if (mount_data != mount_data_global)
2749 kfree(mount_data);
2750
2751 mount_data = cifs_compose_mount_options(
2752 cifs_sb->mountdata, full_path + 1,
2753 referrals, &fake_devname);
2754
2755 free_dfs_info_array(referrals, num_referrals);
2756 kfree(fake_devname);
2757 kfree(full_path);
2758
2759 if (IS_ERR(mount_data)) {
2760 rc = PTR_ERR(mount_data);
2761 mount_data = NULL;
2762 goto mount_fail_check;
2763 }
2764
2765 if (tcon)
2766 cifs_put_tcon(tcon);
2767 else if (pSesInfo)
2768 cifs_put_smb_ses(pSesInfo);
2769
2770 cleanup_volume_info(&volume_info);
2771 referral_walks_count++;
2772 FreeXid(xid);
2773 goto try_mount_again;
2774 }
2775 #else /* No DFS support, return error on mount */
2776 rc = -EOPNOTSUPP;
2777 #endif
2778 }
2779
2780 mount_fail_check:
2781 /* on error free sesinfo and tcon struct if needed */
2782 if (rc) {
2783 if (mount_data != mount_data_global)
2784 kfree(mount_data);
2785 /* If find_unc succeeded then rc == 0 so we can not end */
2786 /* up accidently freeing someone elses tcon struct */
2787 if (tcon)
2788 cifs_put_tcon(tcon);
2789 else if (pSesInfo)
2790 cifs_put_smb_ses(pSesInfo);
2791 else
2792 cifs_put_tcp_session(srvTcp);
2793 goto out;
2794 }
2795
2796 /* volume_info->password is freed above when existing session found
2797 (in which case it is not needed anymore) but when new sesion is created
2798 the password ptr is put in the new session structure (in which case the
2799 password will be freed at unmount time) */
2800 out:
2801 /* zero out password before freeing */
2802 cleanup_volume_info(&volume_info);
2803 FreeXid(xid);
2804 return rc;
2805 }
2806
2807 int
2808 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2809 const char *tree, struct cifsTconInfo *tcon,
2810 const struct nls_table *nls_codepage)
2811 {
2812 struct smb_hdr *smb_buffer;
2813 struct smb_hdr *smb_buffer_response;
2814 TCONX_REQ *pSMB;
2815 TCONX_RSP *pSMBr;
2816 unsigned char *bcc_ptr;
2817 int rc = 0;
2818 int length, bytes_left;
2819 __u16 count;
2820
2821 if (ses == NULL)
2822 return -EIO;
2823
2824 smb_buffer = cifs_buf_get();
2825 if (smb_buffer == NULL)
2826 return -ENOMEM;
2827
2828 smb_buffer_response = smb_buffer;
2829
2830 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2831 NULL /*no tid */ , 4 /*wct */ );
2832
2833 smb_buffer->Mid = GetNextMid(ses->server);
2834 smb_buffer->Uid = ses->Suid;
2835 pSMB = (TCONX_REQ *) smb_buffer;
2836 pSMBr = (TCONX_RSP *) smb_buffer_response;
2837
2838 pSMB->AndXCommand = 0xFF;
2839 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2840 bcc_ptr = &pSMB->Password[0];
2841 if ((ses->server->secMode) & SECMODE_USER) {
2842 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2843 *bcc_ptr = 0; /* password is null byte */
2844 bcc_ptr++; /* skip password */
2845 /* already aligned so no need to do it below */
2846 } else {
2847 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2848 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2849 specified as required (when that support is added to
2850 the vfs in the future) as only NTLM or the much
2851 weaker LANMAN (which we do not send by default) is accepted
2852 by Samba (not sure whether other servers allow
2853 NTLMv2 password here) */
2854 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2855 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
2856 (ses->server->secType == LANMAN))
2857 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2858 ses->server->secMode &
2859 SECMODE_PW_ENCRYPT ? true : false,
2860 bcc_ptr);
2861 else
2862 #endif /* CIFS_WEAK_PW_HASH */
2863 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2864 bcc_ptr);
2865
2866 bcc_ptr += CIFS_SESS_KEY_SIZE;
2867 if (ses->capabilities & CAP_UNICODE) {
2868 /* must align unicode strings */
2869 *bcc_ptr = 0; /* null byte password */
2870 bcc_ptr++;
2871 }
2872 }
2873
2874 if (ses->server->secMode &
2875 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2876 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2877
2878 if (ses->capabilities & CAP_STATUS32) {
2879 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2880 }
2881 if (ses->capabilities & CAP_DFS) {
2882 smb_buffer->Flags2 |= SMBFLG2_DFS;
2883 }
2884 if (ses->capabilities & CAP_UNICODE) {
2885 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2886 length =
2887 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2888 6 /* max utf8 char length in bytes */ *
2889 (/* server len*/ + 256 /* share len */), nls_codepage);
2890 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2891 bcc_ptr += 2; /* skip trailing null */
2892 } else { /* ASCII */
2893 strcpy(bcc_ptr, tree);
2894 bcc_ptr += strlen(tree) + 1;
2895 }
2896 strcpy(bcc_ptr, "?????");
2897 bcc_ptr += strlen("?????");
2898 bcc_ptr += 1;
2899 count = bcc_ptr - &pSMB->Password[0];
2900 pSMB->hdr.smb_buf_length += count;
2901 pSMB->ByteCount = cpu_to_le16(count);
2902
2903 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2904 CIFS_STD_OP);
2905
2906 /* above now done in SendReceive */
2907 if ((rc == 0) && (tcon != NULL)) {
2908 bool is_unicode;
2909
2910 tcon->tidStatus = CifsGood;
2911 tcon->need_reconnect = false;
2912 tcon->tid = smb_buffer_response->Tid;
2913 bcc_ptr = pByteArea(smb_buffer_response);
2914 bytes_left = BCC(smb_buffer_response);
2915 length = strnlen(bcc_ptr, bytes_left - 2);
2916 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2917 is_unicode = true;
2918 else
2919 is_unicode = false;
2920
2921
2922 /* skip service field (NB: this field is always ASCII) */
2923 if (length == 3) {
2924 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2925 (bcc_ptr[2] == 'C')) {
2926 cFYI(1, "IPC connection");
2927 tcon->ipc = 1;
2928 }
2929 } else if (length == 2) {
2930 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2931 /* the most common case */
2932 cFYI(1, "disk share connection");
2933 }
2934 }
2935 bcc_ptr += length + 1;
2936 bytes_left -= (length + 1);
2937 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2938
2939 /* mostly informational -- no need to fail on error here */
2940 kfree(tcon->nativeFileSystem);
2941 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2942 bytes_left, is_unicode,
2943 nls_codepage);
2944
2945 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2946
2947 if ((smb_buffer_response->WordCount == 3) ||
2948 (smb_buffer_response->WordCount == 7))
2949 /* field is in same location */
2950 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2951 else
2952 tcon->Flags = 0;
2953 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2954 } else if ((rc == 0) && tcon == NULL) {
2955 /* all we need to save for IPC$ connection */
2956 ses->ipc_tid = smb_buffer_response->Tid;
2957 }
2958
2959 cifs_buf_release(smb_buffer);
2960 return rc;
2961 }
2962
2963 int
2964 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2965 {
2966 int rc = 0;
2967 char *tmp;
2968
2969 if (cifs_sb->tcon)
2970 cifs_put_tcon(cifs_sb->tcon);
2971
2972 cifs_sb->tcon = NULL;
2973 tmp = cifs_sb->prepath;
2974 cifs_sb->prepathlen = 0;
2975 cifs_sb->prepath = NULL;
2976 kfree(tmp);
2977
2978 return rc;
2979 }
2980
2981 int cifs_negotiate_protocol(unsigned int xid, struct cifsSesInfo *ses)
2982 {
2983 int rc = 0;
2984 struct TCP_Server_Info *server = ses->server;
2985
2986 /* only send once per connect */
2987 if (server->maxBuf != 0)
2988 return 0;
2989
2990 rc = CIFSSMBNegotiate(xid, ses);
2991 if (rc == -EAGAIN) {
2992 /* retry only once on 1st time connection */
2993 rc = CIFSSMBNegotiate(xid, ses);
2994 if (rc == -EAGAIN)
2995 rc = -EHOSTDOWN;
2996 }
2997 if (rc == 0) {
2998 spin_lock(&GlobalMid_Lock);
2999 if (server->tcpStatus != CifsExiting)
3000 server->tcpStatus = CifsGood;
3001 else
3002 rc = -EHOSTDOWN;
3003 spin_unlock(&GlobalMid_Lock);
3004
3005 }
3006
3007 return rc;
3008 }
3009
3010
3011 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
3012 struct nls_table *nls_info)
3013 {
3014 int rc = 0;
3015 struct TCP_Server_Info *server = ses->server;
3016
3017 ses->flags = 0;
3018 ses->capabilities = server->capabilities;
3019 if (linuxExtEnabled == 0)
3020 ses->capabilities &= (~CAP_UNIX);
3021
3022 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3023 server->secMode, server->capabilities, server->timeAdj);
3024
3025 rc = CIFS_SessSetup(xid, ses, nls_info);
3026 if (rc) {
3027 cERROR(1, "Send error in SessSetup = %d", rc);
3028 } else {
3029 cFYI(1, "CIFS Session Established successfully");
3030 spin_lock(&GlobalMid_Lock);
3031 ses->status = CifsGood;
3032 ses->need_reconnect = false;
3033 spin_unlock(&GlobalMid_Lock);
3034 }
3035
3036 return rc;
3037 }
3038
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree