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Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6/linux-2.6-openrd.git] / fs / cifs / connect.c
blob3bbcaa716b3c7afb18ee5826261ed11e5cb32aed
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/pagemap.h>
27 #include <linux/ctype.h>
28 #include <linux/utsname.h>
29 #include <linux/mempool.h>
30 #include <linux/delay.h>
31 #include <linux/completion.h>
32 #include <linux/kthread.h>
33 #include <linux/pagevec.h>
34 #include <linux/freezer.h>
35 #include <linux/namei.h>
36 #include <asm/uaccess.h>
37 #include <asm/processor.h>
38 #include <linux/inet.h>
39 #include <net/ipv6.h>
40 #include "cifspdu.h"
41 #include "cifsglob.h"
42 #include "cifsproto.h"
43 #include "cifs_unicode.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include "ntlmssp.h"
47 #include "nterr.h"
48 #include "rfc1002pdu.h"
49 #include "cn_cifs.h"
50
51 #define CIFS_PORT 445
52 #define RFC1001_PORT 139
53
54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
55 unsigned char *p24);
56
57 extern mempool_t *cifs_req_poolp;
58
59 struct smb_vol {
60 char *username;
61 char *password;
62 char *domainname;
63 char *UNC;
64 char *UNCip;
65 char *iocharset; /* local code page for mapping to and from Unicode */
66 char source_rfc1001_name[16]; /* netbios name of client */
67 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
68 uid_t linux_uid;
69 gid_t linux_gid;
70 mode_t file_mode;
71 mode_t dir_mode;
72 unsigned secFlg;
73 bool retry:1;
74 bool intr:1;
75 bool setuids:1;
76 bool override_uid:1;
77 bool override_gid:1;
78 bool dynperm:1;
79 bool noperm:1;
80 bool no_psx_acl:1; /* set if posix acl support should be disabled */
81 bool cifs_acl:1;
82 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
83 bool server_ino:1; /* use inode numbers from server ie UniqueId */
84 bool direct_io:1;
85 bool remap:1; /* set to remap seven reserved chars in filenames */
86 bool posix_paths:1; /* unset to not ask for posix pathnames. */
87 bool no_linux_ext:1;
88 bool sfu_emul:1;
89 bool nullauth:1; /* attempt to authenticate with null user */
90 bool nocase:1; /* request case insensitive filenames */
91 bool nobrl:1; /* disable sending byte range locks to srv */
92 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
93 bool seal:1; /* request transport encryption on share */
94 bool nodfs:1; /* Do not request DFS, even if available */
95 bool local_lease:1; /* check leases only on local system, not remote */
96 bool noblocksnd:1;
97 bool noautotune:1;
98 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
99 unsigned int rsize;
100 unsigned int wsize;
101 unsigned int sockopt;
102 unsigned short int port;
103 char *prepath;
104 };
105
106 static int ipv4_connect(struct TCP_Server_Info *server);
107 static int ipv6_connect(struct TCP_Server_Info *server);
108
109 /*
110 * cifs tcp session reconnection
111 *
112 * mark tcp session as reconnecting so temporarily locked
113 * mark all smb sessions as reconnecting for tcp session
114 * reconnect tcp session
115 * wake up waiters on reconnection? - (not needed currently)
116 */
117 static int
118 cifs_reconnect(struct TCP_Server_Info *server)
119 {
120 int rc = 0;
121 struct list_head *tmp, *tmp2;
122 struct cifsSesInfo *ses;
123 struct cifsTconInfo *tcon;
124 struct mid_q_entry *mid_entry;
125
126 spin_lock(&GlobalMid_Lock);
127 if (server->tcpStatus == CifsExiting) {
128 /* the demux thread will exit normally
129 next time through the loop */
130 spin_unlock(&GlobalMid_Lock);
131 return rc;
132 } else
133 server->tcpStatus = CifsNeedReconnect;
134 spin_unlock(&GlobalMid_Lock);
135 server->maxBuf = 0;
136
137 cFYI(1, ("Reconnecting tcp session"));
138
139 /* before reconnecting the tcp session, mark the smb session (uid)
140 and the tid bad so they are not used until reconnected */
141 read_lock(&cifs_tcp_ses_lock);
142 list_for_each(tmp, &server->smb_ses_list) {
143 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
144 ses->need_reconnect = true;
145 ses->ipc_tid = 0;
146 list_for_each(tmp2, &ses->tcon_list) {
147 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
148 tcon->need_reconnect = true;
149 }
150 }
151 read_unlock(&cifs_tcp_ses_lock);
152 /* do not want to be sending data on a socket we are freeing */
153 mutex_lock(&server->srv_mutex);
154 if (server->ssocket) {
155 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
156 server->ssocket->flags));
157 kernel_sock_shutdown(server->ssocket, SHUT_WR);
158 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
159 server->ssocket->state,
160 server->ssocket->flags));
161 sock_release(server->ssocket);
162 server->ssocket = NULL;
163 }
164
165 spin_lock(&GlobalMid_Lock);
166 list_for_each(tmp, &server->pending_mid_q) {
167 mid_entry = list_entry(tmp, struct
168 mid_q_entry,
169 qhead);
170 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
171 /* Mark other intransit requests as needing
172 retry so we do not immediately mark the
173 session bad again (ie after we reconnect
174 below) as they timeout too */
175 mid_entry->midState = MID_RETRY_NEEDED;
176 }
177 }
178 spin_unlock(&GlobalMid_Lock);
179 mutex_unlock(&server->srv_mutex);
180
181 while ((server->tcpStatus != CifsExiting) &&
182 (server->tcpStatus != CifsGood)) {
183 try_to_freeze();
184 if (server->addr.sockAddr6.sin6_family == AF_INET6)
185 rc = ipv6_connect(server);
186 else
187 rc = ipv4_connect(server);
188 if (rc) {
189 cFYI(1, ("reconnect error %d", rc));
190 msleep(3000);
191 } else {
192 atomic_inc(&tcpSesReconnectCount);
193 spin_lock(&GlobalMid_Lock);
194 if (server->tcpStatus != CifsExiting)
195 server->tcpStatus = CifsGood;
196 server->sequence_number = 0;
197 spin_unlock(&GlobalMid_Lock);
198 /* atomic_set(&server->inFlight,0);*/
199 wake_up(&server->response_q);
200 }
201 }
202 return rc;
203 }
204
205 /*
206 return codes:
207 0 not a transact2, or all data present
208 >0 transact2 with that much data missing
209 -EINVAL = invalid transact2
210
211 */
212 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
213 {
214 struct smb_t2_rsp *pSMBt;
215 int total_data_size;
216 int data_in_this_rsp;
217 int remaining;
218
219 if (pSMB->Command != SMB_COM_TRANSACTION2)
220 return 0;
221
222 /* check for plausible wct, bcc and t2 data and parm sizes */
223 /* check for parm and data offset going beyond end of smb */
224 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
225 cFYI(1, ("invalid transact2 word count"));
226 return -EINVAL;
227 }
228
229 pSMBt = (struct smb_t2_rsp *)pSMB;
230
231 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
232 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
233
234 remaining = total_data_size - data_in_this_rsp;
235
236 if (remaining == 0)
237 return 0;
238 else if (remaining < 0) {
239 cFYI(1, ("total data %d smaller than data in frame %d",
240 total_data_size, data_in_this_rsp));
241 return -EINVAL;
242 } else {
243 cFYI(1, ("missing %d bytes from transact2, check next response",
244 remaining));
245 if (total_data_size > maxBufSize) {
246 cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
247 total_data_size, maxBufSize));
248 return -EINVAL;
249 }
250 return remaining;
251 }
252 }
253
254 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
255 {
256 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
257 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
258 int total_data_size;
259 int total_in_buf;
260 int remaining;
261 int total_in_buf2;
262 char *data_area_of_target;
263 char *data_area_of_buf2;
264 __u16 byte_count;
265
266 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
267
268 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
269 cFYI(1, ("total data size of primary and secondary t2 differ"));
270 }
271
272 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
273
274 remaining = total_data_size - total_in_buf;
275
276 if (remaining < 0)
277 return -EINVAL;
278
279 if (remaining == 0) /* nothing to do, ignore */
280 return 0;
281
282 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
283 if (remaining < total_in_buf2) {
284 cFYI(1, ("transact2 2nd response contains too much data"));
285 }
286
287 /* find end of first SMB data area */
288 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
289 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
290 /* validate target area */
291
292 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
293 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
294
295 data_area_of_target += total_in_buf;
296
297 /* copy second buffer into end of first buffer */
298 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
299 total_in_buf += total_in_buf2;
300 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
301 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
302 byte_count += total_in_buf2;
303 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
304
305 byte_count = pTargetSMB->smb_buf_length;
306 byte_count += total_in_buf2;
307
308 /* BB also add check that we are not beyond maximum buffer size */
309
310 pTargetSMB->smb_buf_length = byte_count;
311
312 if (remaining == total_in_buf2) {
313 cFYI(1, ("found the last secondary response"));
314 return 0; /* we are done */
315 } else /* more responses to go */
316 return 1;
317
318 }
319
320 static int
321 cifs_demultiplex_thread(struct TCP_Server_Info *server)
322 {
323 int length;
324 unsigned int pdu_length, total_read;
325 struct smb_hdr *smb_buffer = NULL;
326 struct smb_hdr *bigbuf = NULL;
327 struct smb_hdr *smallbuf = NULL;
328 struct msghdr smb_msg;
329 struct kvec iov;
330 struct socket *csocket = server->ssocket;
331 struct list_head *tmp;
332 struct cifsSesInfo *ses;
333 struct task_struct *task_to_wake = NULL;
334 struct mid_q_entry *mid_entry;
335 char temp;
336 bool isLargeBuf = false;
337 bool isMultiRsp;
338 int reconnect;
339
340 current->flags |= PF_MEMALLOC;
341 cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
342
343 length = atomic_inc_return(&tcpSesAllocCount);
344 if (length > 1)
345 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
346 GFP_KERNEL);
347
348 set_freezable();
349 while (server->tcpStatus != CifsExiting) {
350 if (try_to_freeze())
351 continue;
352 if (bigbuf == NULL) {
353 bigbuf = cifs_buf_get();
354 if (!bigbuf) {
355 cERROR(1, ("No memory for large SMB response"));
356 msleep(3000);
357 /* retry will check if exiting */
358 continue;
359 }
360 } else if (isLargeBuf) {
361 /* we are reusing a dirty large buf, clear its start */
362 memset(bigbuf, 0, sizeof(struct smb_hdr));
363 }
364
365 if (smallbuf == NULL) {
366 smallbuf = cifs_small_buf_get();
367 if (!smallbuf) {
368 cERROR(1, ("No memory for SMB response"));
369 msleep(1000);
370 /* retry will check if exiting */
371 continue;
372 }
373 /* beginning of smb buffer is cleared in our buf_get */
374 } else /* if existing small buf clear beginning */
375 memset(smallbuf, 0, sizeof(struct smb_hdr));
376
377 isLargeBuf = false;
378 isMultiRsp = false;
379 smb_buffer = smallbuf;
380 iov.iov_base = smb_buffer;
381 iov.iov_len = 4;
382 smb_msg.msg_control = NULL;
383 smb_msg.msg_controllen = 0;
384 pdu_length = 4; /* enough to get RFC1001 header */
385 incomplete_rcv:
386 length =
387 kernel_recvmsg(csocket, &smb_msg,
388 &iov, 1, pdu_length, 0 /* BB other flags? */);
389
390 if (server->tcpStatus == CifsExiting) {
391 break;
392 } else if (server->tcpStatus == CifsNeedReconnect) {
393 cFYI(1, ("Reconnect after server stopped responding"));
394 cifs_reconnect(server);
395 cFYI(1, ("call to reconnect done"));
396 csocket = server->ssocket;
397 continue;
398 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
399 msleep(1); /* minimum sleep to prevent looping
400 allowing socket to clear and app threads to set
401 tcpStatus CifsNeedReconnect if server hung */
402 if (pdu_length < 4) {
403 iov.iov_base = (4 - pdu_length) +
404 (char *)smb_buffer;
405 iov.iov_len = pdu_length;
406 smb_msg.msg_control = NULL;
407 smb_msg.msg_controllen = 0;
408 goto incomplete_rcv;
409 } else
410 continue;
411 } else if (length <= 0) {
412 if (server->tcpStatus == CifsNew) {
413 cFYI(1, ("tcp session abend after SMBnegprot"));
414 /* some servers kill the TCP session rather than
415 returning an SMB negprot error, in which
416 case reconnecting here is not going to help,
417 and so simply return error to mount */
418 break;
419 }
420 if (!try_to_freeze() && (length == -EINTR)) {
421 cFYI(1, ("cifsd thread killed"));
422 break;
423 }
424 cFYI(1, ("Reconnect after unexpected peek error %d",
425 length));
426 cifs_reconnect(server);
427 csocket = server->ssocket;
428 wake_up(&server->response_q);
429 continue;
430 } else if (length < pdu_length) {
431 cFYI(1, ("requested %d bytes but only got %d bytes",
432 pdu_length, length));
433 pdu_length -= length;
434 msleep(1);
435 goto incomplete_rcv;
436 }
437
438 /* The right amount was read from socket - 4 bytes */
439 /* so we can now interpret the length field */
440
441 /* the first byte big endian of the length field,
442 is actually not part of the length but the type
443 with the most common, zero, as regular data */
444 temp = *((char *) smb_buffer);
445
446 /* Note that FC 1001 length is big endian on the wire,
447 but we convert it here so it is always manipulated
448 as host byte order */
449 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
450 smb_buffer->smb_buf_length = pdu_length;
451
452 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
453
454 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
455 continue;
456 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
457 cFYI(1, ("Good RFC 1002 session rsp"));
458 continue;
459 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
460 /* we get this from Windows 98 instead of
461 an error on SMB negprot response */
462 cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
463 pdu_length));
464 if (server->tcpStatus == CifsNew) {
465 /* if nack on negprot (rather than
466 ret of smb negprot error) reconnecting
467 not going to help, ret error to mount */
468 break;
469 } else {
470 /* give server a second to
471 clean up before reconnect attempt */
472 msleep(1000);
473 /* always try 445 first on reconnect
474 since we get NACK on some if we ever
475 connected to port 139 (the NACK is
476 since we do not begin with RFC1001
477 session initialize frame) */
478 server->addr.sockAddr.sin_port =
479 htons(CIFS_PORT);
480 cifs_reconnect(server);
481 csocket = server->ssocket;
482 wake_up(&server->response_q);
483 continue;
484 }
485 } else if (temp != (char) 0) {
486 cERROR(1, ("Unknown RFC 1002 frame"));
487 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
488 length);
489 cifs_reconnect(server);
490 csocket = server->ssocket;
491 continue;
492 }
493
494 /* else we have an SMB response */
495 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
496 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
497 cERROR(1, ("Invalid size SMB length %d pdu_length %d",
498 length, pdu_length+4));
499 cifs_reconnect(server);
500 csocket = server->ssocket;
501 wake_up(&server->response_q);
502 continue;
503 }
504
505 /* else length ok */
506 reconnect = 0;
507
508 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
509 isLargeBuf = true;
510 memcpy(bigbuf, smallbuf, 4);
511 smb_buffer = bigbuf;
512 }
513 length = 0;
514 iov.iov_base = 4 + (char *)smb_buffer;
515 iov.iov_len = pdu_length;
516 for (total_read = 0; total_read < pdu_length;
517 total_read += length) {
518 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
519 pdu_length - total_read, 0);
520 if ((server->tcpStatus == CifsExiting) ||
521 (length == -EINTR)) {
522 /* then will exit */
523 reconnect = 2;
524 break;
525 } else if (server->tcpStatus == CifsNeedReconnect) {
526 cifs_reconnect(server);
527 csocket = server->ssocket;
528 /* Reconnect wakes up rspns q */
529 /* Now we will reread sock */
530 reconnect = 1;
531 break;
532 } else if ((length == -ERESTARTSYS) ||
533 (length == -EAGAIN)) {
534 msleep(1); /* minimum sleep to prevent looping,
535 allowing socket to clear and app
536 threads to set tcpStatus
537 CifsNeedReconnect if server hung*/
538 length = 0;
539 continue;
540 } else if (length <= 0) {
541 cERROR(1, ("Received no data, expecting %d",
542 pdu_length - total_read));
543 cifs_reconnect(server);
544 csocket = server->ssocket;
545 reconnect = 1;
546 break;
547 }
548 }
549 if (reconnect == 2)
550 break;
551 else if (reconnect == 1)
552 continue;
553
554 length += 4; /* account for rfc1002 hdr */
555
556
557 dump_smb(smb_buffer, length);
558 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
559 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
560 continue;
561 }
562
563
564 task_to_wake = NULL;
565 spin_lock(&GlobalMid_Lock);
566 list_for_each(tmp, &server->pending_mid_q) {
567 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
568
569 if ((mid_entry->mid == smb_buffer->Mid) &&
570 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
571 (mid_entry->command == smb_buffer->Command)) {
572 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
573 /* We have a multipart transact2 resp */
574 isMultiRsp = true;
575 if (mid_entry->resp_buf) {
576 /* merge response - fix up 1st*/
577 if (coalesce_t2(smb_buffer,
578 mid_entry->resp_buf)) {
579 mid_entry->multiRsp =
580 true;
581 break;
582 } else {
583 /* all parts received */
584 mid_entry->multiEnd =
585 true;
586 goto multi_t2_fnd;
587 }
588 } else {
589 if (!isLargeBuf) {
590 cERROR(1,("1st trans2 resp needs bigbuf"));
591 /* BB maybe we can fix this up, switch
592 to already allocated large buffer? */
593 } else {
594 /* Have first buffer */
595 mid_entry->resp_buf =
596 smb_buffer;
597 mid_entry->largeBuf =
598 true;
599 bigbuf = NULL;
600 }
601 }
602 break;
603 }
604 mid_entry->resp_buf = smb_buffer;
605 mid_entry->largeBuf = isLargeBuf;
606 multi_t2_fnd:
607 task_to_wake = mid_entry->tsk;
608 mid_entry->midState = MID_RESPONSE_RECEIVED;
609 #ifdef CONFIG_CIFS_STATS2
610 mid_entry->when_received = jiffies;
611 #endif
612 /* so we do not time out requests to server
613 which is still responding (since server could
614 be busy but not dead) */
615 server->lstrp = jiffies;
616 break;
617 }
618 }
619 spin_unlock(&GlobalMid_Lock);
620 if (task_to_wake) {
621 /* Was previous buf put in mpx struct for multi-rsp? */
622 if (!isMultiRsp) {
623 /* smb buffer will be freed by user thread */
624 if (isLargeBuf)
625 bigbuf = NULL;
626 else
627 smallbuf = NULL;
628 }
629 wake_up_process(task_to_wake);
630 } else if (!is_valid_oplock_break(smb_buffer, server) &&
631 !isMultiRsp) {
632 cERROR(1, ("No task to wake, unknown frame received! "
633 "NumMids %d", midCount.counter));
634 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
635 sizeof(struct smb_hdr));
636 #ifdef CONFIG_CIFS_DEBUG2
637 cifs_dump_detail(smb_buffer);
638 cifs_dump_mids(server);
639 #endif /* CIFS_DEBUG2 */
640
641 }
642 } /* end while !EXITING */
643
644 /* take it off the list, if it's not already */
645 write_lock(&cifs_tcp_ses_lock);
646 list_del_init(&server->tcp_ses_list);
647 write_unlock(&cifs_tcp_ses_lock);
648
649 spin_lock(&GlobalMid_Lock);
650 server->tcpStatus = CifsExiting;
651 spin_unlock(&GlobalMid_Lock);
652 wake_up_all(&server->response_q);
653
654 /* check if we have blocked requests that need to free */
655 /* Note that cifs_max_pending is normally 50, but
656 can be set at module install time to as little as two */
657 spin_lock(&GlobalMid_Lock);
658 if (atomic_read(&server->inFlight) >= cifs_max_pending)
659 atomic_set(&server->inFlight, cifs_max_pending - 1);
660 /* We do not want to set the max_pending too low or we
661 could end up with the counter going negative */
662 spin_unlock(&GlobalMid_Lock);
663 /* Although there should not be any requests blocked on
664 this queue it can not hurt to be paranoid and try to wake up requests
665 that may haven been blocked when more than 50 at time were on the wire
666 to the same server - they now will see the session is in exit state
667 and get out of SendReceive. */
668 wake_up_all(&server->request_q);
669 /* give those requests time to exit */
670 msleep(125);
671
672 if (server->ssocket) {
673 sock_release(csocket);
674 server->ssocket = NULL;
675 }
676 /* buffer usuallly freed in free_mid - need to free it here on exit */
677 cifs_buf_release(bigbuf);
678 if (smallbuf) /* no sense logging a debug message if NULL */
679 cifs_small_buf_release(smallbuf);
680
681 /*
682 * BB: we shouldn't have to do any of this. It shouldn't be
683 * possible to exit from the thread with active SMB sessions
684 */
685 read_lock(&cifs_tcp_ses_lock);
686 if (list_empty(&server->pending_mid_q)) {
687 /* loop through server session structures attached to this and
688 mark them dead */
689 list_for_each(tmp, &server->smb_ses_list) {
690 ses = list_entry(tmp, struct cifsSesInfo,
691 smb_ses_list);
692 ses->status = CifsExiting;
693 ses->server = NULL;
694 }
695 read_unlock(&cifs_tcp_ses_lock);
696 } else {
697 /* although we can not zero the server struct pointer yet,
698 since there are active requests which may depnd on them,
699 mark the corresponding SMB sessions as exiting too */
700 list_for_each(tmp, &server->smb_ses_list) {
701 ses = list_entry(tmp, struct cifsSesInfo,
702 smb_ses_list);
703 ses->status = CifsExiting;
704 }
705
706 spin_lock(&GlobalMid_Lock);
707 list_for_each(tmp, &server->pending_mid_q) {
708 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
709 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
710 cFYI(1, ("Clearing Mid 0x%x - waking up ",
711 mid_entry->mid));
712 task_to_wake = mid_entry->tsk;
713 if (task_to_wake)
714 wake_up_process(task_to_wake);
715 }
716 }
717 spin_unlock(&GlobalMid_Lock);
718 read_unlock(&cifs_tcp_ses_lock);
719 /* 1/8th of sec is more than enough time for them to exit */
720 msleep(125);
721 }
722
723 if (!list_empty(&server->pending_mid_q)) {
724 /* mpx threads have not exited yet give them
725 at least the smb send timeout time for long ops */
726 /* due to delays on oplock break requests, we need
727 to wait at least 45 seconds before giving up
728 on a request getting a response and going ahead
729 and killing cifsd */
730 cFYI(1, ("Wait for exit from demultiplex thread"));
731 msleep(46000);
732 /* if threads still have not exited they are probably never
733 coming home not much else we can do but free the memory */
734 }
735
736 /* last chance to mark ses pointers invalid
737 if there are any pointing to this (e.g
738 if a crazy root user tried to kill cifsd
739 kernel thread explicitly this might happen) */
740 /* BB: This shouldn't be necessary, see above */
741 read_lock(&cifs_tcp_ses_lock);
742 list_for_each(tmp, &server->smb_ses_list) {
743 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
744 ses->server = NULL;
745 }
746 read_unlock(&cifs_tcp_ses_lock);
747
748 kfree(server->hostname);
749 task_to_wake = xchg(&server->tsk, NULL);
750 kfree(server);
751
752 length = atomic_dec_return(&tcpSesAllocCount);
753 if (length > 0)
754 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
755 GFP_KERNEL);
756
757 /* if server->tsk was NULL then wait for a signal before exiting */
758 if (!task_to_wake) {
759 set_current_state(TASK_INTERRUPTIBLE);
760 while (!signal_pending(current)) {
761 schedule();
762 set_current_state(TASK_INTERRUPTIBLE);
763 }
764 set_current_state(TASK_RUNNING);
765 }
766
767 module_put_and_exit(0);
768 }
769
770 /* extract the host portion of the UNC string */
771 static char *
772 extract_hostname(const char *unc)
773 {
774 const char *src;
775 char *dst, *delim;
776 unsigned int len;
777
778 /* skip double chars at beginning of string */
779 /* BB: check validity of these bytes? */
780 src = unc + 2;
781
782 /* delimiter between hostname and sharename is always '\\' now */
783 delim = strchr(src, '\\');
784 if (!delim)
785 return ERR_PTR(-EINVAL);
786
787 len = delim - src;
788 dst = kmalloc((len + 1), GFP_KERNEL);
789 if (dst == NULL)
790 return ERR_PTR(-ENOMEM);
791
792 memcpy(dst, src, len);
793 dst[len] = '\0';
794
795 return dst;
796 }
797
798 static int
799 cifs_parse_mount_options(char *options, const char *devname,
800 struct smb_vol *vol)
801 {
802 char *value;
803 char *data;
804 unsigned int temp_len, i, j;
805 char separator[2];
806 short int override_uid = -1;
807 short int override_gid = -1;
808 bool uid_specified = false;
809 bool gid_specified = false;
810
811 separator[0] = ',';
812 separator[1] = 0;
813
814 if (Local_System_Name[0] != 0)
815 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
816 else {
817 char *nodename = utsname()->nodename;
818 int n = strnlen(nodename, 15);
819 memset(vol->source_rfc1001_name, 0x20, 15);
820 for (i = 0; i < n; i++) {
821 /* does not have to be perfect mapping since field is
822 informational, only used for servers that do not support
823 port 445 and it can be overridden at mount time */
824 vol->source_rfc1001_name[i] = toupper(nodename[i]);
825 }
826 }
827 vol->source_rfc1001_name[15] = 0;
828 /* null target name indicates to use *SMBSERVR default called name
829 if we end up sending RFC1001 session initialize */
830 vol->target_rfc1001_name[0] = 0;
831 vol->linux_uid = current_uid(); /* use current_euid() instead? */
832 vol->linux_gid = current_gid();
833
834 /* default to only allowing write access to owner of the mount */
835 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
836
837 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
838 /* default is always to request posix paths. */
839 vol->posix_paths = 1;
840 /* default to using server inode numbers where available */
841 vol->server_ino = 1;
842
843 if (!options)
844 return 1;
845
846 if (strncmp(options, "sep=", 4) == 0) {
847 if (options[4] != 0) {
848 separator[0] = options[4];
849 options += 5;
850 } else {
851 cFYI(1, ("Null separator not allowed"));
852 }
853 }
854
855 while ((data = strsep(&options, separator)) != NULL) {
856 if (!*data)
857 continue;
858 if ((value = strchr(data, '=')) != NULL)
859 *value++ = '\0';
860
861 /* Have to parse this before we parse for "user" */
862 if (strnicmp(data, "user_xattr", 10) == 0) {
863 vol->no_xattr = 0;
864 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
865 vol->no_xattr = 1;
866 } else if (strnicmp(data, "user", 4) == 0) {
867 if (!value) {
868 printk(KERN_WARNING
869 "CIFS: invalid or missing username\n");
870 return 1; /* needs_arg; */
871 } else if (!*value) {
872 /* null user, ie anonymous, authentication */
873 vol->nullauth = 1;
874 }
875 if (strnlen(value, 200) < 200) {
876 vol->username = value;
877 } else {
878 printk(KERN_WARNING "CIFS: username too long\n");
879 return 1;
880 }
881 } else if (strnicmp(data, "pass", 4) == 0) {
882 if (!value) {
883 vol->password = NULL;
884 continue;
885 } else if (value[0] == 0) {
886 /* check if string begins with double comma
887 since that would mean the password really
888 does start with a comma, and would not
889 indicate an empty string */
890 if (value[1] != separator[0]) {
891 vol->password = NULL;
892 continue;
893 }
894 }
895 temp_len = strlen(value);
896 /* removed password length check, NTLM passwords
897 can be arbitrarily long */
898
899 /* if comma in password, the string will be
900 prematurely null terminated. Commas in password are
901 specified across the cifs mount interface by a double
902 comma ie ,, and a comma used as in other cases ie ','
903 as a parameter delimiter/separator is single and due
904 to the strsep above is temporarily zeroed. */
905
906 /* NB: password legally can have multiple commas and
907 the only illegal character in a password is null */
908
909 if ((value[temp_len] == 0) &&
910 (value[temp_len+1] == separator[0])) {
911 /* reinsert comma */
912 value[temp_len] = separator[0];
913 temp_len += 2; /* move after second comma */
914 while (value[temp_len] != 0) {
915 if (value[temp_len] == separator[0]) {
916 if (value[temp_len+1] ==
917 separator[0]) {
918 /* skip second comma */
919 temp_len++;
920 } else {
921 /* single comma indicating start
922 of next parm */
923 break;
924 }
925 }
926 temp_len++;
927 }
928 if (value[temp_len] == 0) {
929 options = NULL;
930 } else {
931 value[temp_len] = 0;
932 /* point option to start of next parm */
933 options = value + temp_len + 1;
934 }
935 /* go from value to value + temp_len condensing
936 double commas to singles. Note that this ends up
937 allocating a few bytes too many, which is ok */
938 vol->password = kzalloc(temp_len, GFP_KERNEL);
939 if (vol->password == NULL) {
940 printk(KERN_WARNING "CIFS: no memory "
941 "for password\n");
942 return 1;
943 }
944 for (i = 0, j = 0; i < temp_len; i++, j++) {
945 vol->password[j] = value[i];
946 if (value[i] == separator[0]
947 && value[i+1] == separator[0]) {
948 /* skip second comma */
949 i++;
950 }
951 }
952 vol->password[j] = 0;
953 } else {
954 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
955 if (vol->password == NULL) {
956 printk(KERN_WARNING "CIFS: no memory "
957 "for password\n");
958 return 1;
959 }
960 strcpy(vol->password, value);
961 }
962 } else if (!strnicmp(data, "ip", 2) ||
963 !strnicmp(data, "addr", 4)) {
964 if (!value || !*value) {
965 vol->UNCip = NULL;
966 } else if (strnlen(value, INET6_ADDRSTRLEN) <
967 INET6_ADDRSTRLEN) {
968 vol->UNCip = value;
969 } else {
970 printk(KERN_WARNING "CIFS: ip address "
971 "too long\n");
972 return 1;
973 }
974 } else if (strnicmp(data, "sec", 3) == 0) {
975 if (!value || !*value) {
976 cERROR(1, ("no security value specified"));
977 continue;
978 } else if (strnicmp(value, "krb5i", 5) == 0) {
979 vol->secFlg |= CIFSSEC_MAY_KRB5 |
980 CIFSSEC_MUST_SIGN;
981 } else if (strnicmp(value, "krb5p", 5) == 0) {
982 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
983 CIFSSEC_MAY_KRB5; */
984 cERROR(1, ("Krb5 cifs privacy not supported"));
985 return 1;
986 } else if (strnicmp(value, "krb5", 4) == 0) {
987 vol->secFlg |= CIFSSEC_MAY_KRB5;
988 #ifdef CONFIG_CIFS_EXPERIMENTAL
989 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
990 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
991 CIFSSEC_MUST_SIGN;
992 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
993 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
994 #endif
995 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
996 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
997 CIFSSEC_MUST_SIGN;
998 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
999 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1000 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1001 vol->secFlg |= CIFSSEC_MAY_NTLM |
1002 CIFSSEC_MUST_SIGN;
1003 } else if (strnicmp(value, "ntlm", 4) == 0) {
1004 /* ntlm is default so can be turned off too */
1005 vol->secFlg |= CIFSSEC_MAY_NTLM;
1006 } else if (strnicmp(value, "nontlm", 6) == 0) {
1007 /* BB is there a better way to do this? */
1008 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1009 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1010 } else if (strnicmp(value, "lanman", 6) == 0) {
1011 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1012 #endif
1013 } else if (strnicmp(value, "none", 4) == 0) {
1014 vol->nullauth = 1;
1015 } else {
1016 cERROR(1, ("bad security option: %s", value));
1017 return 1;
1018 }
1019 } else if ((strnicmp(data, "unc", 3) == 0)
1020 || (strnicmp(data, "target", 6) == 0)
1021 || (strnicmp(data, "path", 4) == 0)) {
1022 if (!value || !*value) {
1023 printk(KERN_WARNING "CIFS: invalid path to "
1024 "network resource\n");
1025 return 1; /* needs_arg; */
1026 }
1027 if ((temp_len = strnlen(value, 300)) < 300) {
1028 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1029 if (vol->UNC == NULL)
1030 return 1;
1031 strcpy(vol->UNC, value);
1032 if (strncmp(vol->UNC, "//", 2) == 0) {
1033 vol->UNC[0] = '\\';
1034 vol->UNC[1] = '\\';
1035 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1036 printk(KERN_WARNING
1037 "CIFS: UNC Path does not begin "
1038 "with // or \\\\ \n");
1039 return 1;
1040 }
1041 } else {
1042 printk(KERN_WARNING "CIFS: UNC name too long\n");
1043 return 1;
1044 }
1045 } else if ((strnicmp(data, "domain", 3) == 0)
1046 || (strnicmp(data, "workgroup", 5) == 0)) {
1047 if (!value || !*value) {
1048 printk(KERN_WARNING "CIFS: invalid domain name\n");
1049 return 1; /* needs_arg; */
1050 }
1051 /* BB are there cases in which a comma can be valid in
1052 a domain name and need special handling? */
1053 if (strnlen(value, 256) < 256) {
1054 vol->domainname = value;
1055 cFYI(1, ("Domain name set"));
1056 } else {
1057 printk(KERN_WARNING "CIFS: domain name too "
1058 "long\n");
1059 return 1;
1060 }
1061 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1062 if (!value || !*value) {
1063 printk(KERN_WARNING
1064 "CIFS: invalid path prefix\n");
1065 return 1; /* needs_argument */
1066 }
1067 if ((temp_len = strnlen(value, 1024)) < 1024) {
1068 if (value[0] != '/')
1069 temp_len++; /* missing leading slash */
1070 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1071 if (vol->prepath == NULL)
1072 return 1;
1073 if (value[0] != '/') {
1074 vol->prepath[0] = '/';
1075 strcpy(vol->prepath+1, value);
1076 } else
1077 strcpy(vol->prepath, value);
1078 cFYI(1, ("prefix path %s", vol->prepath));
1079 } else {
1080 printk(KERN_WARNING "CIFS: prefix too long\n");
1081 return 1;
1082 }
1083 } else if (strnicmp(data, "iocharset", 9) == 0) {
1084 if (!value || !*value) {
1085 printk(KERN_WARNING "CIFS: invalid iocharset "
1086 "specified\n");
1087 return 1; /* needs_arg; */
1088 }
1089 if (strnlen(value, 65) < 65) {
1090 if (strnicmp(value, "default", 7))
1091 vol->iocharset = value;
1092 /* if iocharset not set then load_nls_default
1093 is used by caller */
1094 cFYI(1, ("iocharset set to %s", value));
1095 } else {
1096 printk(KERN_WARNING "CIFS: iocharset name "
1097 "too long.\n");
1098 return 1;
1099 }
1100 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1101 vol->linux_uid = simple_strtoul(value, &value, 0);
1102 uid_specified = true;
1103 } else if (!strnicmp(data, "forceuid", 8)) {
1104 override_uid = 1;
1105 } else if (!strnicmp(data, "noforceuid", 10)) {
1106 override_uid = 0;
1107 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1108 vol->linux_gid = simple_strtoul(value, &value, 0);
1109 gid_specified = true;
1110 } else if (!strnicmp(data, "forcegid", 8)) {
1111 override_gid = 1;
1112 } else if (!strnicmp(data, "noforcegid", 10)) {
1113 override_gid = 0;
1114 } else if (strnicmp(data, "file_mode", 4) == 0) {
1115 if (value && *value) {
1116 vol->file_mode =
1117 simple_strtoul(value, &value, 0);
1118 }
1119 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1120 if (value && *value) {
1121 vol->dir_mode =
1122 simple_strtoul(value, &value, 0);
1123 }
1124 } else if (strnicmp(data, "dirmode", 4) == 0) {
1125 if (value && *value) {
1126 vol->dir_mode =
1127 simple_strtoul(value, &value, 0);
1128 }
1129 } else if (strnicmp(data, "port", 4) == 0) {
1130 if (value && *value) {
1131 vol->port =
1132 simple_strtoul(value, &value, 0);
1133 }
1134 } else if (strnicmp(data, "rsize", 5) == 0) {
1135 if (value && *value) {
1136 vol->rsize =
1137 simple_strtoul(value, &value, 0);
1138 }
1139 } else if (strnicmp(data, "wsize", 5) == 0) {
1140 if (value && *value) {
1141 vol->wsize =
1142 simple_strtoul(value, &value, 0);
1143 }
1144 } else if (strnicmp(data, "sockopt", 5) == 0) {
1145 if (value && *value) {
1146 vol->sockopt =
1147 simple_strtoul(value, &value, 0);
1148 }
1149 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1150 if (!value || !*value || (*value == ' ')) {
1151 cFYI(1, ("invalid (empty) netbiosname"));
1152 } else {
1153 memset(vol->source_rfc1001_name, 0x20, 15);
1154 for (i = 0; i < 15; i++) {
1155 /* BB are there cases in which a comma can be
1156 valid in this workstation netbios name (and need
1157 special handling)? */
1158
1159 /* We do not uppercase netbiosname for user */
1160 if (value[i] == 0)
1161 break;
1162 else
1163 vol->source_rfc1001_name[i] =
1164 value[i];
1165 }
1166 /* The string has 16th byte zero still from
1167 set at top of the function */
1168 if ((i == 15) && (value[i] != 0))
1169 printk(KERN_WARNING "CIFS: netbiosname"
1170 " longer than 15 truncated.\n");
1171 }
1172 } else if (strnicmp(data, "servern", 7) == 0) {
1173 /* servernetbiosname specified override *SMBSERVER */
1174 if (!value || !*value || (*value == ' ')) {
1175 cFYI(1, ("empty server netbiosname specified"));
1176 } else {
1177 /* last byte, type, is 0x20 for servr type */
1178 memset(vol->target_rfc1001_name, 0x20, 16);
1179
1180 for (i = 0; i < 15; i++) {
1181 /* BB are there cases in which a comma can be
1182 valid in this workstation netbios name
1183 (and need special handling)? */
1184
1185 /* user or mount helper must uppercase
1186 the netbiosname */
1187 if (value[i] == 0)
1188 break;
1189 else
1190 vol->target_rfc1001_name[i] =
1191 value[i];
1192 }
1193 /* The string has 16th byte zero still from
1194 set at top of the function */
1195 if ((i == 15) && (value[i] != 0))
1196 printk(KERN_WARNING "CIFS: server net"
1197 "biosname longer than 15 truncated.\n");
1198 }
1199 } else if (strnicmp(data, "credentials", 4) == 0) {
1200 /* ignore */
1201 } else if (strnicmp(data, "version", 3) == 0) {
1202 /* ignore */
1203 } else if (strnicmp(data, "guest", 5) == 0) {
1204 /* ignore */
1205 } else if (strnicmp(data, "rw", 2) == 0) {
1206 /* ignore */
1207 } else if (strnicmp(data, "ro", 2) == 0) {
1208 /* ignore */
1209 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1210 vol->noblocksnd = 1;
1211 } else if (strnicmp(data, "noautotune", 10) == 0) {
1212 vol->noautotune = 1;
1213 } else if ((strnicmp(data, "suid", 4) == 0) ||
1214 (strnicmp(data, "nosuid", 6) == 0) ||
1215 (strnicmp(data, "exec", 4) == 0) ||
1216 (strnicmp(data, "noexec", 6) == 0) ||
1217 (strnicmp(data, "nodev", 5) == 0) ||
1218 (strnicmp(data, "noauto", 6) == 0) ||
1219 (strnicmp(data, "dev", 3) == 0)) {
1220 /* The mount tool or mount.cifs helper (if present)
1221 uses these opts to set flags, and the flags are read
1222 by the kernel vfs layer before we get here (ie
1223 before read super) so there is no point trying to
1224 parse these options again and set anything and it
1225 is ok to just ignore them */
1226 continue;
1227 } else if (strnicmp(data, "hard", 4) == 0) {
1228 vol->retry = 1;
1229 } else if (strnicmp(data, "soft", 4) == 0) {
1230 vol->retry = 0;
1231 } else if (strnicmp(data, "perm", 4) == 0) {
1232 vol->noperm = 0;
1233 } else if (strnicmp(data, "noperm", 6) == 0) {
1234 vol->noperm = 1;
1235 } else if (strnicmp(data, "mapchars", 8) == 0) {
1236 vol->remap = 1;
1237 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1238 vol->remap = 0;
1239 } else if (strnicmp(data, "sfu", 3) == 0) {
1240 vol->sfu_emul = 1;
1241 } else if (strnicmp(data, "nosfu", 5) == 0) {
1242 vol->sfu_emul = 0;
1243 } else if (strnicmp(data, "nodfs", 5) == 0) {
1244 vol->nodfs = 1;
1245 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1246 vol->posix_paths = 1;
1247 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1248 vol->posix_paths = 0;
1249 } else if (strnicmp(data, "nounix", 6) == 0) {
1250 vol->no_linux_ext = 1;
1251 } else if (strnicmp(data, "nolinux", 7) == 0) {
1252 vol->no_linux_ext = 1;
1253 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1254 (strnicmp(data, "ignorecase", 10) == 0)) {
1255 vol->nocase = 1;
1256 } else if (strnicmp(data, "brl", 3) == 0) {
1257 vol->nobrl = 0;
1258 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1259 (strnicmp(data, "nolock", 6) == 0)) {
1260 vol->nobrl = 1;
1261 /* turn off mandatory locking in mode
1262 if remote locking is turned off since the
1263 local vfs will do advisory */
1264 if (vol->file_mode ==
1265 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1266 vol->file_mode = S_IALLUGO;
1267 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1268 /* will take the shorter form "forcemand" as well */
1269 /* This mount option will force use of mandatory
1270 (DOS/Windows style) byte range locks, instead of
1271 using posix advisory byte range locks, even if the
1272 Unix extensions are available and posix locks would
1273 be supported otherwise. If Unix extensions are not
1274 negotiated this has no effect since mandatory locks
1275 would be used (mandatory locks is all that those
1276 those servers support) */
1277 vol->mand_lock = 1;
1278 } else if (strnicmp(data, "setuids", 7) == 0) {
1279 vol->setuids = 1;
1280 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1281 vol->setuids = 0;
1282 } else if (strnicmp(data, "dynperm", 7) == 0) {
1283 vol->dynperm = true;
1284 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1285 vol->dynperm = false;
1286 } else if (strnicmp(data, "nohard", 6) == 0) {
1287 vol->retry = 0;
1288 } else if (strnicmp(data, "nosoft", 6) == 0) {
1289 vol->retry = 1;
1290 } else if (strnicmp(data, "nointr", 6) == 0) {
1291 vol->intr = 0;
1292 } else if (strnicmp(data, "intr", 4) == 0) {
1293 vol->intr = 1;
1294 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1295 vol->nostrictsync = 1;
1296 } else if (strnicmp(data, "strictsync", 10) == 0) {
1297 vol->nostrictsync = 0;
1298 } else if (strnicmp(data, "serverino", 7) == 0) {
1299 vol->server_ino = 1;
1300 } else if (strnicmp(data, "noserverino", 9) == 0) {
1301 vol->server_ino = 0;
1302 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1303 vol->cifs_acl = 1;
1304 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1305 vol->cifs_acl = 0;
1306 } else if (strnicmp(data, "acl", 3) == 0) {
1307 vol->no_psx_acl = 0;
1308 } else if (strnicmp(data, "noacl", 5) == 0) {
1309 vol->no_psx_acl = 1;
1310 #ifdef CONFIG_CIFS_EXPERIMENTAL
1311 } else if (strnicmp(data, "locallease", 6) == 0) {
1312 vol->local_lease = 1;
1313 #endif
1314 } else if (strnicmp(data, "sign", 4) == 0) {
1315 vol->secFlg |= CIFSSEC_MUST_SIGN;
1316 } else if (strnicmp(data, "seal", 4) == 0) {
1317 /* we do not do the following in secFlags because seal
1318 is a per tree connection (mount) not a per socket
1319 or per-smb connection option in the protocol */
1320 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1321 vol->seal = 1;
1322 } else if (strnicmp(data, "direct", 6) == 0) {
1323 vol->direct_io = 1;
1324 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1325 vol->direct_io = 1;
1326 } else if (strnicmp(data, "noac", 4) == 0) {
1327 printk(KERN_WARNING "CIFS: Mount option noac not "
1328 "supported. Instead set "
1329 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1330 } else
1331 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1332 data);
1333 }
1334 if (vol->UNC == NULL) {
1335 if (devname == NULL) {
1336 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1337 "target\n");
1338 return 1;
1339 }
1340 if ((temp_len = strnlen(devname, 300)) < 300) {
1341 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1342 if (vol->UNC == NULL)
1343 return 1;
1344 strcpy(vol->UNC, devname);
1345 if (strncmp(vol->UNC, "//", 2) == 0) {
1346 vol->UNC[0] = '\\';
1347 vol->UNC[1] = '\\';
1348 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1349 printk(KERN_WARNING "CIFS: UNC Path does not "
1350 "begin with // or \\\\ \n");
1351 return 1;
1352 }
1353 value = strpbrk(vol->UNC+2, "/\\");
1354 if (value)
1355 *value = '\\';
1356 } else {
1357 printk(KERN_WARNING "CIFS: UNC name too long\n");
1358 return 1;
1359 }
1360 }
1361 if (vol->UNCip == NULL)
1362 vol->UNCip = &vol->UNC[2];
1363
1364 if (uid_specified)
1365 vol->override_uid = override_uid;
1366 else if (override_uid == 1)
1367 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1368 "specified with no uid= option.\n");
1369
1370 if (gid_specified)
1371 vol->override_gid = override_gid;
1372 else if (override_gid == 1)
1373 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1374 "specified with no gid= option.\n");
1375
1376 return 0;
1377 }
1378
1379 static struct TCP_Server_Info *
1380 cifs_find_tcp_session(struct sockaddr_storage *addr, unsigned short int port)
1381 {
1382 struct list_head *tmp;
1383 struct TCP_Server_Info *server;
1384 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1385 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1386
1387 write_lock(&cifs_tcp_ses_lock);
1388 list_for_each(tmp, &cifs_tcp_ses_list) {
1389 server = list_entry(tmp, struct TCP_Server_Info,
1390 tcp_ses_list);
1391 /*
1392 * the demux thread can exit on its own while still in CifsNew
1393 * so don't accept any sockets in that state. Since the
1394 * tcpStatus never changes back to CifsNew it's safe to check
1395 * for this without a lock.
1396 */
1397 if (server->tcpStatus == CifsNew)
1398 continue;
1399
1400 switch (addr->ss_family) {
1401 case AF_INET:
1402 if (addr4->sin_addr.s_addr ==
1403 server->addr.sockAddr.sin_addr.s_addr) {
1404 addr4->sin_port = htons(port);
1405 /* user overrode default port? */
1406 if (addr4->sin_port) {
1407 if (addr4->sin_port !=
1408 server->addr.sockAddr.sin_port)
1409 continue;
1410 }
1411 break;
1412 } else
1413 continue;
1414
1415 case AF_INET6:
1416 if (ipv6_addr_equal(&addr6->sin6_addr,
1417 &server->addr.sockAddr6.sin6_addr) &&
1418 (addr6->sin6_scope_id ==
1419 server->addr.sockAddr6.sin6_scope_id)) {
1420 addr6->sin6_port = htons(port);
1421 /* user overrode default port? */
1422 if (addr6->sin6_port) {
1423 if (addr6->sin6_port !=
1424 server->addr.sockAddr6.sin6_port)
1425 continue;
1426 }
1427 break;
1428 } else
1429 continue;
1430 }
1431
1432 ++server->srv_count;
1433 write_unlock(&cifs_tcp_ses_lock);
1434 cFYI(1, ("Existing tcp session with server found"));
1435 return server;
1436 }
1437 write_unlock(&cifs_tcp_ses_lock);
1438 return NULL;
1439 }
1440
1441 static void
1442 cifs_put_tcp_session(struct TCP_Server_Info *server)
1443 {
1444 struct task_struct *task;
1445
1446 write_lock(&cifs_tcp_ses_lock);
1447 if (--server->srv_count > 0) {
1448 write_unlock(&cifs_tcp_ses_lock);
1449 return;
1450 }
1451
1452 list_del_init(&server->tcp_ses_list);
1453 write_unlock(&cifs_tcp_ses_lock);
1454
1455 spin_lock(&GlobalMid_Lock);
1456 server->tcpStatus = CifsExiting;
1457 spin_unlock(&GlobalMid_Lock);
1458
1459 task = xchg(&server->tsk, NULL);
1460 if (task)
1461 force_sig(SIGKILL, task);
1462 }
1463
1464 static struct TCP_Server_Info *
1465 cifs_get_tcp_session(struct smb_vol *volume_info)
1466 {
1467 struct TCP_Server_Info *tcp_ses = NULL;
1468 struct sockaddr_storage addr;
1469 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1470 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1471 int rc;
1472
1473 memset(&addr, 0, sizeof(struct sockaddr_storage));
1474
1475 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
1476
1477 if (volume_info->UNCip && volume_info->UNC) {
1478 rc = cifs_convert_address(volume_info->UNCip, &addr);
1479 if (!rc) {
1480 /* we failed translating address */
1481 rc = -EINVAL;
1482 goto out_err;
1483 }
1484 } else if (volume_info->UNCip) {
1485 /* BB using ip addr as tcp_ses name to connect to the
1486 DFS root below */
1487 cERROR(1, ("Connecting to DFS root not implemented yet"));
1488 rc = -EINVAL;
1489 goto out_err;
1490 } else /* which tcp_sess DFS root would we conect to */ {
1491 cERROR(1,
1492 ("CIFS mount error: No UNC path (e.g. -o "
1493 "unc=//192.168.1.100/public) specified"));
1494 rc = -EINVAL;
1495 goto out_err;
1496 }
1497
1498 /* see if we already have a matching tcp_ses */
1499 tcp_ses = cifs_find_tcp_session(&addr, volume_info->port);
1500 if (tcp_ses)
1501 return tcp_ses;
1502
1503 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1504 if (!tcp_ses) {
1505 rc = -ENOMEM;
1506 goto out_err;
1507 }
1508
1509 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1510 if (IS_ERR(tcp_ses->hostname)) {
1511 rc = PTR_ERR(tcp_ses->hostname);
1512 goto out_err;
1513 }
1514
1515 tcp_ses->noblocksnd = volume_info->noblocksnd;
1516 tcp_ses->noautotune = volume_info->noautotune;
1517 atomic_set(&tcp_ses->inFlight, 0);
1518 init_waitqueue_head(&tcp_ses->response_q);
1519 init_waitqueue_head(&tcp_ses->request_q);
1520 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1521 mutex_init(&tcp_ses->srv_mutex);
1522 memcpy(tcp_ses->workstation_RFC1001_name,
1523 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1524 memcpy(tcp_ses->server_RFC1001_name,
1525 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1526 tcp_ses->sequence_number = 0;
1527 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1528 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1529
1530 /*
1531 * at this point we are the only ones with the pointer
1532 * to the struct since the kernel thread not created yet
1533 * no need to spinlock this init of tcpStatus or srv_count
1534 */
1535 tcp_ses->tcpStatus = CifsNew;
1536 ++tcp_ses->srv_count;
1537
1538 if (addr.ss_family == AF_INET6) {
1539 cFYI(1, ("attempting ipv6 connect"));
1540 /* BB should we allow ipv6 on port 139? */
1541 /* other OS never observed in Wild doing 139 with v6 */
1542 sin_server6->sin6_port = htons(volume_info->port);
1543 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1544 sizeof(struct sockaddr_in6));
1545 rc = ipv6_connect(tcp_ses);
1546 } else {
1547 sin_server->sin_port = htons(volume_info->port);
1548 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1549 sizeof(struct sockaddr_in));
1550 rc = ipv4_connect(tcp_ses);
1551 }
1552 if (rc < 0) {
1553 cERROR(1, ("Error connecting to socket. Aborting operation"));
1554 goto out_err;
1555 }
1556
1557 /*
1558 * since we're in a cifs function already, we know that
1559 * this will succeed. No need for try_module_get().
1560 */
1561 __module_get(THIS_MODULE);
1562 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1563 tcp_ses, "cifsd");
1564 if (IS_ERR(tcp_ses->tsk)) {
1565 rc = PTR_ERR(tcp_ses->tsk);
1566 cERROR(1, ("error %d create cifsd thread", rc));
1567 module_put(THIS_MODULE);
1568 goto out_err;
1569 }
1570
1571 /* thread spawned, put it on the list */
1572 write_lock(&cifs_tcp_ses_lock);
1573 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1574 write_unlock(&cifs_tcp_ses_lock);
1575
1576 return tcp_ses;
1577
1578 out_err:
1579 if (tcp_ses) {
1580 if (!IS_ERR(tcp_ses->hostname))
1581 kfree(tcp_ses->hostname);
1582 if (tcp_ses->ssocket)
1583 sock_release(tcp_ses->ssocket);
1584 kfree(tcp_ses);
1585 }
1586 return ERR_PTR(rc);
1587 }
1588
1589 static struct cifsSesInfo *
1590 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1591 {
1592 struct list_head *tmp;
1593 struct cifsSesInfo *ses;
1594
1595 write_lock(&cifs_tcp_ses_lock);
1596 list_for_each(tmp, &server->smb_ses_list) {
1597 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1598 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1599 continue;
1600
1601 ++ses->ses_count;
1602 write_unlock(&cifs_tcp_ses_lock);
1603 return ses;
1604 }
1605 write_unlock(&cifs_tcp_ses_lock);
1606 return NULL;
1607 }
1608
1609 static void
1610 cifs_put_smb_ses(struct cifsSesInfo *ses)
1611 {
1612 int xid;
1613 struct TCP_Server_Info *server = ses->server;
1614
1615 write_lock(&cifs_tcp_ses_lock);
1616 if (--ses->ses_count > 0) {
1617 write_unlock(&cifs_tcp_ses_lock);
1618 return;
1619 }
1620
1621 list_del_init(&ses->smb_ses_list);
1622 write_unlock(&cifs_tcp_ses_lock);
1623
1624 if (ses->status == CifsGood) {
1625 xid = GetXid();
1626 CIFSSMBLogoff(xid, ses);
1627 _FreeXid(xid);
1628 }
1629 sesInfoFree(ses);
1630 cifs_put_tcp_session(server);
1631 }
1632
1633 static struct cifsTconInfo *
1634 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1635 {
1636 struct list_head *tmp;
1637 struct cifsTconInfo *tcon;
1638
1639 write_lock(&cifs_tcp_ses_lock);
1640 list_for_each(tmp, &ses->tcon_list) {
1641 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1642 if (tcon->tidStatus == CifsExiting)
1643 continue;
1644 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1645 continue;
1646
1647 ++tcon->tc_count;
1648 write_unlock(&cifs_tcp_ses_lock);
1649 return tcon;
1650 }
1651 write_unlock(&cifs_tcp_ses_lock);
1652 return NULL;
1653 }
1654
1655 static void
1656 cifs_put_tcon(struct cifsTconInfo *tcon)
1657 {
1658 int xid;
1659 struct cifsSesInfo *ses = tcon->ses;
1660
1661 write_lock(&cifs_tcp_ses_lock);
1662 if (--tcon->tc_count > 0) {
1663 write_unlock(&cifs_tcp_ses_lock);
1664 return;
1665 }
1666
1667 list_del_init(&tcon->tcon_list);
1668 write_unlock(&cifs_tcp_ses_lock);
1669
1670 xid = GetXid();
1671 CIFSSMBTDis(xid, tcon);
1672 _FreeXid(xid);
1673
1674 tconInfoFree(tcon);
1675 cifs_put_smb_ses(ses);
1676 }
1677
1678 int
1679 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1680 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1681 struct dfs_info3_param **preferrals, int remap)
1682 {
1683 char *temp_unc;
1684 int rc = 0;
1685
1686 *pnum_referrals = 0;
1687 *preferrals = NULL;
1688
1689 if (pSesInfo->ipc_tid == 0) {
1690 temp_unc = kmalloc(2 /* for slashes */ +
1691 strnlen(pSesInfo->serverName,
1692 SERVER_NAME_LEN_WITH_NULL * 2)
1693 + 1 + 4 /* slash IPC$ */ + 2,
1694 GFP_KERNEL);
1695 if (temp_unc == NULL)
1696 return -ENOMEM;
1697 temp_unc[0] = '\\';
1698 temp_unc[1] = '\\';
1699 strcpy(temp_unc + 2, pSesInfo->serverName);
1700 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1701 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1702 cFYI(1,
1703 ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1704 kfree(temp_unc);
1705 }
1706 if (rc == 0)
1707 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1708 pnum_referrals, nls_codepage, remap);
1709 /* BB map targetUNCs to dfs_info3 structures, here or
1710 in CIFSGetDFSRefer BB */
1711
1712 return rc;
1713 }
1714
1715 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1716 static struct lock_class_key cifs_key[2];
1717 static struct lock_class_key cifs_slock_key[2];
1718
1719 static inline void
1720 cifs_reclassify_socket4(struct socket *sock)
1721 {
1722 struct sock *sk = sock->sk;
1723 BUG_ON(sock_owned_by_user(sk));
1724 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1725 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1726 }
1727
1728 static inline void
1729 cifs_reclassify_socket6(struct socket *sock)
1730 {
1731 struct sock *sk = sock->sk;
1732 BUG_ON(sock_owned_by_user(sk));
1733 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1734 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1735 }
1736 #else
1737 static inline void
1738 cifs_reclassify_socket4(struct socket *sock)
1739 {
1740 }
1741
1742 static inline void
1743 cifs_reclassify_socket6(struct socket *sock)
1744 {
1745 }
1746 #endif
1747
1748 /* See RFC1001 section 14 on representation of Netbios names */
1749 static void rfc1002mangle(char *target, char *source, unsigned int length)
1750 {
1751 unsigned int i, j;
1752
1753 for (i = 0, j = 0; i < (length); i++) {
1754 /* mask a nibble at a time and encode */
1755 target[j] = 'A' + (0x0F & (source[i] >> 4));
1756 target[j+1] = 'A' + (0x0F & source[i]);
1757 j += 2;
1758 }
1759
1760 }
1761
1762
1763 static int
1764 ipv4_connect(struct TCP_Server_Info *server)
1765 {
1766 int rc = 0;
1767 bool connected = false;
1768 __be16 orig_port = 0;
1769 struct socket *socket = server->ssocket;
1770
1771 if (socket == NULL) {
1772 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1773 IPPROTO_TCP, &socket);
1774 if (rc < 0) {
1775 cERROR(1, ("Error %d creating socket", rc));
1776 return rc;
1777 }
1778
1779 /* BB other socket options to set KEEPALIVE, NODELAY? */
1780 cFYI(1, ("Socket created"));
1781 server->ssocket = socket;
1782 socket->sk->sk_allocation = GFP_NOFS;
1783 cifs_reclassify_socket4(socket);
1784 }
1785
1786 /* user overrode default port */
1787 if (server->addr.sockAddr.sin_port) {
1788 rc = socket->ops->connect(socket, (struct sockaddr *)
1789 &server->addr.sockAddr,
1790 sizeof(struct sockaddr_in), 0);
1791 if (rc >= 0)
1792 connected = true;
1793 }
1794
1795 if (!connected) {
1796 /* save original port so we can retry user specified port
1797 later if fall back ports fail this time */
1798 orig_port = server->addr.sockAddr.sin_port;
1799
1800 /* do not retry on the same port we just failed on */
1801 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1802 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1803 rc = socket->ops->connect(socket,
1804 (struct sockaddr *)
1805 &server->addr.sockAddr,
1806 sizeof(struct sockaddr_in), 0);
1807 if (rc >= 0)
1808 connected = true;
1809 }
1810 }
1811 if (!connected) {
1812 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1813 rc = socket->ops->connect(socket, (struct sockaddr *)
1814 &server->addr.sockAddr,
1815 sizeof(struct sockaddr_in), 0);
1816 if (rc >= 0)
1817 connected = true;
1818 }
1819
1820 /* give up here - unless we want to retry on different
1821 protocol families some day */
1822 if (!connected) {
1823 if (orig_port)
1824 server->addr.sockAddr.sin_port = orig_port;
1825 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1826 sock_release(socket);
1827 server->ssocket = NULL;
1828 return rc;
1829 }
1830
1831
1832 /*
1833 * Eventually check for other socket options to change from
1834 * the default. sock_setsockopt not used because it expects
1835 * user space buffer
1836 */
1837 socket->sk->sk_rcvtimeo = 7 * HZ;
1838 socket->sk->sk_sndtimeo = 5 * HZ;
1839
1840 /* make the bufsizes depend on wsize/rsize and max requests */
1841 if (server->noautotune) {
1842 if (socket->sk->sk_sndbuf < (200 * 1024))
1843 socket->sk->sk_sndbuf = 200 * 1024;
1844 if (socket->sk->sk_rcvbuf < (140 * 1024))
1845 socket->sk->sk_rcvbuf = 140 * 1024;
1846 }
1847
1848 cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1849 socket->sk->sk_sndbuf,
1850 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1851
1852 /* send RFC1001 sessinit */
1853 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1854 /* some servers require RFC1001 sessinit before sending
1855 negprot - BB check reconnection in case where second
1856 sessinit is sent but no second negprot */
1857 struct rfc1002_session_packet *ses_init_buf;
1858 struct smb_hdr *smb_buf;
1859 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1860 GFP_KERNEL);
1861 if (ses_init_buf) {
1862 ses_init_buf->trailer.session_req.called_len = 32;
1863 if (server->server_RFC1001_name &&
1864 server->server_RFC1001_name[0] != 0)
1865 rfc1002mangle(ses_init_buf->trailer.
1866 session_req.called_name,
1867 server->server_RFC1001_name,
1868 RFC1001_NAME_LEN_WITH_NULL);
1869 else
1870 rfc1002mangle(ses_init_buf->trailer.
1871 session_req.called_name,
1872 DEFAULT_CIFS_CALLED_NAME,
1873 RFC1001_NAME_LEN_WITH_NULL);
1874
1875 ses_init_buf->trailer.session_req.calling_len = 32;
1876
1877 /* calling name ends in null (byte 16) from old smb
1878 convention. */
1879 if (server->workstation_RFC1001_name &&
1880 server->workstation_RFC1001_name[0] != 0)
1881 rfc1002mangle(ses_init_buf->trailer.
1882 session_req.calling_name,
1883 server->workstation_RFC1001_name,
1884 RFC1001_NAME_LEN_WITH_NULL);
1885 else
1886 rfc1002mangle(ses_init_buf->trailer.
1887 session_req.calling_name,
1888 "LINUX_CIFS_CLNT",
1889 RFC1001_NAME_LEN_WITH_NULL);
1890
1891 ses_init_buf->trailer.session_req.scope1 = 0;
1892 ses_init_buf->trailer.session_req.scope2 = 0;
1893 smb_buf = (struct smb_hdr *)ses_init_buf;
1894 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1895 smb_buf->smb_buf_length = 0x81000044;
1896 rc = smb_send(server, smb_buf, 0x44);
1897 kfree(ses_init_buf);
1898 msleep(1); /* RFC1001 layer in at least one server
1899 requires very short break before negprot
1900 presumably because not expecting negprot
1901 to follow so fast. This is a simple
1902 solution that works without
1903 complicating the code and causes no
1904 significant slowing down on mount
1905 for everyone else */
1906 }
1907 /* else the negprot may still work without this
1908 even though malloc failed */
1909
1910 }
1911
1912 return rc;
1913 }
1914
1915 static int
1916 ipv6_connect(struct TCP_Server_Info *server)
1917 {
1918 int rc = 0;
1919 bool connected = false;
1920 __be16 orig_port = 0;
1921 struct socket *socket = server->ssocket;
1922
1923 if (socket == NULL) {
1924 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1925 IPPROTO_TCP, &socket);
1926 if (rc < 0) {
1927 cERROR(1, ("Error %d creating ipv6 socket", rc));
1928 socket = NULL;
1929 return rc;
1930 }
1931
1932 /* BB other socket options to set KEEPALIVE, NODELAY? */
1933 cFYI(1, ("ipv6 Socket created"));
1934 server->ssocket = socket;
1935 socket->sk->sk_allocation = GFP_NOFS;
1936 cifs_reclassify_socket6(socket);
1937 }
1938
1939 /* user overrode default port */
1940 if (server->addr.sockAddr6.sin6_port) {
1941 rc = socket->ops->connect(socket,
1942 (struct sockaddr *) &server->addr.sockAddr6,
1943 sizeof(struct sockaddr_in6), 0);
1944 if (rc >= 0)
1945 connected = true;
1946 }
1947
1948 if (!connected) {
1949 /* save original port so we can retry user specified port
1950 later if fall back ports fail this time */
1951
1952 orig_port = server->addr.sockAddr6.sin6_port;
1953 /* do not retry on the same port we just failed on */
1954 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1955 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1956 rc = socket->ops->connect(socket, (struct sockaddr *)
1957 &server->addr.sockAddr6,
1958 sizeof(struct sockaddr_in6), 0);
1959 if (rc >= 0)
1960 connected = true;
1961 }
1962 }
1963 if (!connected) {
1964 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1965 rc = socket->ops->connect(socket, (struct sockaddr *)
1966 &server->addr.sockAddr6,
1967 sizeof(struct sockaddr_in6), 0);
1968 if (rc >= 0)
1969 connected = true;
1970 }
1971
1972 /* give up here - unless we want to retry on different
1973 protocol families some day */
1974 if (!connected) {
1975 if (orig_port)
1976 server->addr.sockAddr6.sin6_port = orig_port;
1977 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1978 sock_release(socket);
1979 server->ssocket = NULL;
1980 return rc;
1981 }
1982
1983 /*
1984 * Eventually check for other socket options to change from
1985 * the default. sock_setsockopt not used because it expects
1986 * user space buffer
1987 */
1988 socket->sk->sk_rcvtimeo = 7 * HZ;
1989 socket->sk->sk_sndtimeo = 5 * HZ;
1990 server->ssocket = socket;
1991
1992 return rc;
1993 }
1994
1995 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1996 struct super_block *sb, struct smb_vol *vol_info)
1997 {
1998 /* if we are reconnecting then should we check to see if
1999 * any requested capabilities changed locally e.g. via
2000 * remount but we can not do much about it here
2001 * if they have (even if we could detect it by the following)
2002 * Perhaps we could add a backpointer to array of sb from tcon
2003 * or if we change to make all sb to same share the same
2004 * sb as NFS - then we only have one backpointer to sb.
2005 * What if we wanted to mount the server share twice once with
2006 * and once without posixacls or posix paths? */
2007 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2008
2009 if (vol_info && vol_info->no_linux_ext) {
2010 tcon->fsUnixInfo.Capability = 0;
2011 tcon->unix_ext = 0; /* Unix Extensions disabled */
2012 cFYI(1, ("Linux protocol extensions disabled"));
2013 return;
2014 } else if (vol_info)
2015 tcon->unix_ext = 1; /* Unix Extensions supported */
2016
2017 if (tcon->unix_ext == 0) {
2018 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
2019 return;
2020 }
2021
2022 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2023 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2024
2025 /* check for reconnect case in which we do not
2026 want to change the mount behavior if we can avoid it */
2027 if (vol_info == NULL) {
2028 /* turn off POSIX ACL and PATHNAMES if not set
2029 originally at mount time */
2030 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2031 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2032 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2033 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2034 cERROR(1, ("POSIXPATH support change"));
2035 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2036 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2037 cERROR(1, ("possible reconnect error"));
2038 cERROR(1,
2039 ("server disabled POSIX path support"));
2040 }
2041 }
2042
2043 cap &= CIFS_UNIX_CAP_MASK;
2044 if (vol_info && vol_info->no_psx_acl)
2045 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2046 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2047 cFYI(1, ("negotiated posix acl support"));
2048 if (sb)
2049 sb->s_flags |= MS_POSIXACL;
2050 }
2051
2052 if (vol_info && vol_info->posix_paths == 0)
2053 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2054 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2055 cFYI(1, ("negotiate posix pathnames"));
2056 if (sb)
2057 CIFS_SB(sb)->mnt_cifs_flags |=
2058 CIFS_MOUNT_POSIX_PATHS;
2059 }
2060
2061 /* We might be setting the path sep back to a different
2062 form if we are reconnecting and the server switched its
2063 posix path capability for this share */
2064 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2065 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2066
2067 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2068 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2069 CIFS_SB(sb)->rsize = 127 * 1024;
2070 cFYI(DBG2,
2071 ("larger reads not supported by srv"));
2072 }
2073 }
2074
2075
2076 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2077 #ifdef CONFIG_CIFS_DEBUG2
2078 if (cap & CIFS_UNIX_FCNTL_CAP)
2079 cFYI(1, ("FCNTL cap"));
2080 if (cap & CIFS_UNIX_EXTATTR_CAP)
2081 cFYI(1, ("EXTATTR cap"));
2082 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2083 cFYI(1, ("POSIX path cap"));
2084 if (cap & CIFS_UNIX_XATTR_CAP)
2085 cFYI(1, ("XATTR cap"));
2086 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2087 cFYI(1, ("POSIX ACL cap"));
2088 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2089 cFYI(1, ("very large read cap"));
2090 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2091 cFYI(1, ("very large write cap"));
2092 #endif /* CIFS_DEBUG2 */
2093 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2094 if (vol_info == NULL) {
2095 cFYI(1, ("resetting capabilities failed"));
2096 } else
2097 cERROR(1, ("Negotiating Unix capabilities "
2098 "with the server failed. Consider "
2099 "mounting with the Unix Extensions\n"
2100 "disabled, if problems are found, "
2101 "by specifying the nounix mount "
2102 "option."));
2103
2104 }
2105 }
2106 }
2107
2108 static void
2109 convert_delimiter(char *path, char delim)
2110 {
2111 int i;
2112 char old_delim;
2113
2114 if (path == NULL)
2115 return;
2116
2117 if (delim == '/')
2118 old_delim = '\\';
2119 else
2120 old_delim = '/';
2121
2122 for (i = 0; path[i] != '\0'; i++) {
2123 if (path[i] == old_delim)
2124 path[i] = delim;
2125 }
2126 }
2127
2128 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2129 struct cifs_sb_info *cifs_sb)
2130 {
2131 if (pvolume_info->rsize > CIFSMaxBufSize) {
2132 cERROR(1, ("rsize %d too large, using MaxBufSize",
2133 pvolume_info->rsize));
2134 cifs_sb->rsize = CIFSMaxBufSize;
2135 } else if ((pvolume_info->rsize) &&
2136 (pvolume_info->rsize <= CIFSMaxBufSize))
2137 cifs_sb->rsize = pvolume_info->rsize;
2138 else /* default */
2139 cifs_sb->rsize = CIFSMaxBufSize;
2140
2141 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2142 cERROR(1, ("wsize %d too large, using 4096 instead",
2143 pvolume_info->wsize));
2144 cifs_sb->wsize = 4096;
2145 } else if (pvolume_info->wsize)
2146 cifs_sb->wsize = pvolume_info->wsize;
2147 else
2148 cifs_sb->wsize = min_t(const int,
2149 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2150 127*1024);
2151 /* old default of CIFSMaxBufSize was too small now
2152 that SMB Write2 can send multiple pages in kvec.
2153 RFC1001 does not describe what happens when frame
2154 bigger than 128K is sent so use that as max in
2155 conjunction with 52K kvec constraint on arch with 4K
2156 page size */
2157
2158 if (cifs_sb->rsize < 2048) {
2159 cifs_sb->rsize = 2048;
2160 /* Windows ME may prefer this */
2161 cFYI(1, ("readsize set to minimum: 2048"));
2162 }
2163 /* calculate prepath */
2164 cifs_sb->prepath = pvolume_info->prepath;
2165 if (cifs_sb->prepath) {
2166 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2167 /* we can not convert the / to \ in the path
2168 separators in the prefixpath yet because we do not
2169 know (until reset_cifs_unix_caps is called later)
2170 whether POSIX PATH CAP is available. We normalize
2171 the / to \ after reset_cifs_unix_caps is called */
2172 pvolume_info->prepath = NULL;
2173 } else
2174 cifs_sb->prepathlen = 0;
2175 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2176 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2177 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2178 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2179 cFYI(1, ("file mode: 0x%x dir mode: 0x%x",
2180 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2181
2182 if (pvolume_info->noperm)
2183 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2184 if (pvolume_info->setuids)
2185 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2186 if (pvolume_info->server_ino)
2187 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2188 if (pvolume_info->remap)
2189 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2190 if (pvolume_info->no_xattr)
2191 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2192 if (pvolume_info->sfu_emul)
2193 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2194 if (pvolume_info->nobrl)
2195 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2196 if (pvolume_info->nostrictsync)
2197 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2198 if (pvolume_info->mand_lock)
2199 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2200 if (pvolume_info->cifs_acl)
2201 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2202 if (pvolume_info->override_uid)
2203 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2204 if (pvolume_info->override_gid)
2205 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2206 if (pvolume_info->dynperm)
2207 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2208 if (pvolume_info->direct_io) {
2209 cFYI(1, ("mounting share using direct i/o"));
2210 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2211 }
2212
2213 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2214 cERROR(1, ("mount option dynperm ignored if cifsacl "
2215 "mount option supported"));
2216 }
2217
2218 static int
2219 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2220 struct cifs_sb_info *cifs_sb, const char *full_path)
2221 {
2222 int rc;
2223 FILE_ALL_INFO *pfile_info;
2224
2225 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2226 if (pfile_info == NULL)
2227 return -ENOMEM;
2228
2229 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2230 0 /* not legacy */, cifs_sb->local_nls,
2231 cifs_sb->mnt_cifs_flags &
2232 CIFS_MOUNT_MAP_SPECIAL_CHR);
2233 kfree(pfile_info);
2234 return rc;
2235 }
2236
2237 static void
2238 cleanup_volume_info(struct smb_vol **pvolume_info)
2239 {
2240 struct smb_vol *volume_info;
2241
2242 if (!pvolume_info && !*pvolume_info)
2243 return;
2244
2245 volume_info = *pvolume_info;
2246 kzfree(volume_info->password);
2247 kfree(volume_info->UNC);
2248 kfree(volume_info->prepath);
2249 kfree(volume_info);
2250 *pvolume_info = NULL;
2251 return;
2252 }
2253
2254 #ifdef CONFIG_CIFS_DFS_UPCALL
2255 /* build_path_to_root returns full path to root when
2256 * we do not have an exiting connection (tcon) */
2257 static char *
2258 build_unc_path_to_root(const struct smb_vol *volume_info,
2259 const struct cifs_sb_info *cifs_sb)
2260 {
2261 char *full_path;
2262
2263 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2264 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2265 if (full_path == NULL)
2266 return ERR_PTR(-ENOMEM);
2267
2268 strncpy(full_path, volume_info->UNC, unc_len);
2269 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2270 int i;
2271 for (i = 0; i < unc_len; i++) {
2272 if (full_path[i] == '\\')
2273 full_path[i] = '/';
2274 }
2275 }
2276
2277 if (cifs_sb->prepathlen)
2278 strncpy(full_path + unc_len, cifs_sb->prepath,
2279 cifs_sb->prepathlen);
2280
2281 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2282 return full_path;
2283 }
2284 #endif
2285
2286 int
2287 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2288 char *mount_data_global, const char *devname)
2289 {
2290 int rc;
2291 int xid;
2292 struct smb_vol *volume_info;
2293 struct cifsSesInfo *pSesInfo;
2294 struct cifsTconInfo *tcon;
2295 struct TCP_Server_Info *srvTcp;
2296 char *full_path;
2297 char *mount_data = mount_data_global;
2298 #ifdef CONFIG_CIFS_DFS_UPCALL
2299 struct dfs_info3_param *referrals = NULL;
2300 unsigned int num_referrals = 0;
2301 int referral_walks_count = 0;
2302 try_mount_again:
2303 #endif
2304 rc = 0;
2305 tcon = NULL;
2306 pSesInfo = NULL;
2307 srvTcp = NULL;
2308 full_path = NULL;
2309
2310 xid = GetXid();
2311
2312 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2313 if (!volume_info) {
2314 rc = -ENOMEM;
2315 goto out;
2316 }
2317
2318 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2319 rc = -EINVAL;
2320 goto out;
2321 }
2322
2323 if (volume_info->nullauth) {
2324 cFYI(1, ("null user"));
2325 volume_info->username = "";
2326 } else if (volume_info->username) {
2327 /* BB fixme parse for domain name here */
2328 cFYI(1, ("Username: %s", volume_info->username));
2329 } else {
2330 cifserror("No username specified");
2331 /* In userspace mount helper we can get user name from alternate
2332 locations such as env variables and files on disk */
2333 rc = -EINVAL;
2334 goto out;
2335 }
2336
2337
2338 /* this is needed for ASCII cp to Unicode converts */
2339 if (volume_info->iocharset == NULL) {
2340 cifs_sb->local_nls = load_nls_default();
2341 /* load_nls_default can not return null */
2342 } else {
2343 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2344 if (cifs_sb->local_nls == NULL) {
2345 cERROR(1, ("CIFS mount error: iocharset %s not found",
2346 volume_info->iocharset));
2347 rc = -ELIBACC;
2348 goto out;
2349 }
2350 }
2351
2352 /* get a reference to a tcp session */
2353 srvTcp = cifs_get_tcp_session(volume_info);
2354 if (IS_ERR(srvTcp)) {
2355 rc = PTR_ERR(srvTcp);
2356 goto out;
2357 }
2358
2359 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2360 if (pSesInfo) {
2361 cFYI(1, ("Existing smb sess found (status=%d)",
2362 pSesInfo->status));
2363 /*
2364 * The existing SMB session already has a reference to srvTcp,
2365 * so we can put back the extra one we got before
2366 */
2367 cifs_put_tcp_session(srvTcp);
2368
2369 down(&pSesInfo->sesSem);
2370 if (pSesInfo->need_reconnect) {
2371 cFYI(1, ("Session needs reconnect"));
2372 rc = cifs_setup_session(xid, pSesInfo,
2373 cifs_sb->local_nls);
2374 }
2375 up(&pSesInfo->sesSem);
2376 } else if (!rc) {
2377 cFYI(1, ("Existing smb sess not found"));
2378 pSesInfo = sesInfoAlloc();
2379 if (pSesInfo == NULL) {
2380 rc = -ENOMEM;
2381 goto mount_fail_check;
2382 }
2383
2384 /* new SMB session uses our srvTcp ref */
2385 pSesInfo->server = srvTcp;
2386 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2387 sprintf(pSesInfo->serverName, "%pI6",
2388 &srvTcp->addr.sockAddr6.sin6_addr);
2389 else
2390 sprintf(pSesInfo->serverName, "%pI4",
2391 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2392
2393 write_lock(&cifs_tcp_ses_lock);
2394 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2395 write_unlock(&cifs_tcp_ses_lock);
2396
2397 /* volume_info->password freed at unmount */
2398 if (volume_info->password) {
2399 pSesInfo->password = kstrdup(volume_info->password,
2400 GFP_KERNEL);
2401 if (!pSesInfo->password) {
2402 rc = -ENOMEM;
2403 goto mount_fail_check;
2404 }
2405 }
2406 if (volume_info->username)
2407 strncpy(pSesInfo->userName, volume_info->username,
2408 MAX_USERNAME_SIZE);
2409 if (volume_info->domainname) {
2410 int len = strlen(volume_info->domainname);
2411 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2412 if (pSesInfo->domainName)
2413 strcpy(pSesInfo->domainName,
2414 volume_info->domainname);
2415 }
2416 pSesInfo->linux_uid = volume_info->linux_uid;
2417 pSesInfo->overrideSecFlg = volume_info->secFlg;
2418 down(&pSesInfo->sesSem);
2419
2420 /* BB FIXME need to pass vol->secFlgs BB */
2421 rc = cifs_setup_session(xid, pSesInfo,
2422 cifs_sb->local_nls);
2423 up(&pSesInfo->sesSem);
2424 }
2425
2426 /* search for existing tcon to this server share */
2427 if (!rc) {
2428 setup_cifs_sb(volume_info, cifs_sb);
2429
2430 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2431 if (tcon) {
2432 cFYI(1, ("Found match on UNC path"));
2433 /* existing tcon already has a reference */
2434 cifs_put_smb_ses(pSesInfo);
2435 if (tcon->seal != volume_info->seal)
2436 cERROR(1, ("transport encryption setting "
2437 "conflicts with existing tid"));
2438 } else {
2439 tcon = tconInfoAlloc();
2440 if (tcon == NULL) {
2441 rc = -ENOMEM;
2442 goto mount_fail_check;
2443 }
2444
2445 tcon->ses = pSesInfo;
2446 if (volume_info->password) {
2447 tcon->password = kstrdup(volume_info->password,
2448 GFP_KERNEL);
2449 if (!tcon->password) {
2450 rc = -ENOMEM;
2451 goto mount_fail_check;
2452 }
2453 }
2454
2455 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2456 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2457 cERROR(1, ("Missing share name"));
2458 rc = -ENODEV;
2459 goto mount_fail_check;
2460 } else {
2461 /* BB Do we need to wrap sesSem around
2462 * this TCon call and Unix SetFS as
2463 * we do on SessSetup and reconnect? */
2464 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2465 tcon, cifs_sb->local_nls);
2466 cFYI(1, ("CIFS Tcon rc = %d", rc));
2467 if (volume_info->nodfs) {
2468 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2469 cFYI(1, ("DFS disabled (%d)",
2470 tcon->Flags));
2471 }
2472 }
2473 if (rc)
2474 goto remote_path_check;
2475 tcon->seal = volume_info->seal;
2476 write_lock(&cifs_tcp_ses_lock);
2477 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2478 write_unlock(&cifs_tcp_ses_lock);
2479 }
2480
2481 /* we can have only one retry value for a connection
2482 to a share so for resources mounted more than once
2483 to the same server share the last value passed in
2484 for the retry flag is used */
2485 tcon->retry = volume_info->retry;
2486 tcon->nocase = volume_info->nocase;
2487 tcon->local_lease = volume_info->local_lease;
2488 }
2489 if (pSesInfo) {
2490 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2491 sb->s_maxbytes = MAX_LFS_FILESIZE;
2492 else
2493 sb->s_maxbytes = MAX_NON_LFS;
2494 }
2495
2496 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2497 sb->s_time_gran = 100;
2498
2499 if (rc)
2500 goto remote_path_check;
2501
2502 cifs_sb->tcon = tcon;
2503
2504 /* do not care if following two calls succeed - informational */
2505 if (!tcon->ipc) {
2506 CIFSSMBQFSDeviceInfo(xid, tcon);
2507 CIFSSMBQFSAttributeInfo(xid, tcon);
2508 }
2509
2510 /* tell server which Unix caps we support */
2511 if (tcon->ses->capabilities & CAP_UNIX)
2512 /* reset of caps checks mount to see if unix extensions
2513 disabled for just this mount */
2514 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2515 else
2516 tcon->unix_ext = 0; /* server does not support them */
2517
2518 /* convert forward to back slashes in prepath here if needed */
2519 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2520 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2521
2522 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2523 cifs_sb->rsize = 1024 * 127;
2524 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2525 }
2526 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2527 cifs_sb->wsize = min(cifs_sb->wsize,
2528 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2529 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2530 cifs_sb->rsize = min(cifs_sb->rsize,
2531 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2532
2533 remote_path_check:
2534 /* check if a whole path (including prepath) is not remote */
2535 if (!rc && cifs_sb->prepathlen && tcon) {
2536 /* build_path_to_root works only when we have a valid tcon */
2537 full_path = cifs_build_path_to_root(cifs_sb);
2538 if (full_path == NULL) {
2539 rc = -ENOMEM;
2540 goto mount_fail_check;
2541 }
2542 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2543 if (rc != -EREMOTE) {
2544 kfree(full_path);
2545 goto mount_fail_check;
2546 }
2547 kfree(full_path);
2548 }
2549
2550 /* get referral if needed */
2551 if (rc == -EREMOTE) {
2552 #ifdef CONFIG_CIFS_DFS_UPCALL
2553 if (referral_walks_count > MAX_NESTED_LINKS) {
2554 /*
2555 * BB: when we implement proper loop detection,
2556 * we will remove this check. But now we need it
2557 * to prevent an indefinite loop if 'DFS tree' is
2558 * misconfigured (i.e. has loops).
2559 */
2560 rc = -ELOOP;
2561 goto mount_fail_check;
2562 }
2563 /* convert forward to back slashes in prepath here if needed */
2564 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2565 convert_delimiter(cifs_sb->prepath,
2566 CIFS_DIR_SEP(cifs_sb));
2567 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2568 if (IS_ERR(full_path)) {
2569 rc = PTR_ERR(full_path);
2570 goto mount_fail_check;
2571 }
2572
2573 cFYI(1, ("Getting referral for: %s", full_path));
2574 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2575 cifs_sb->local_nls, &num_referrals, &referrals,
2576 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2577 if (!rc && num_referrals > 0) {
2578 char *fake_devname = NULL;
2579
2580 if (mount_data != mount_data_global)
2581 kfree(mount_data);
2582
2583 mount_data = cifs_compose_mount_options(
2584 cifs_sb->mountdata, full_path + 1,
2585 referrals, &fake_devname);
2586
2587 free_dfs_info_array(referrals, num_referrals);
2588 kfree(fake_devname);
2589 kfree(full_path);
2590
2591 if (IS_ERR(mount_data)) {
2592 rc = PTR_ERR(mount_data);
2593 mount_data = NULL;
2594 goto mount_fail_check;
2595 }
2596
2597 if (tcon)
2598 cifs_put_tcon(tcon);
2599 else if (pSesInfo)
2600 cifs_put_smb_ses(pSesInfo);
2601
2602 cleanup_volume_info(&volume_info);
2603 referral_walks_count++;
2604 FreeXid(xid);
2605 goto try_mount_again;
2606 }
2607 #else /* No DFS support, return error on mount */
2608 rc = -EOPNOTSUPP;
2609 #endif
2610 }
2611
2612 mount_fail_check:
2613 /* on error free sesinfo and tcon struct if needed */
2614 if (rc) {
2615 if (mount_data != mount_data_global)
2616 kfree(mount_data);
2617 /* If find_unc succeeded then rc == 0 so we can not end */
2618 /* up accidently freeing someone elses tcon struct */
2619 if (tcon)
2620 cifs_put_tcon(tcon);
2621 else if (pSesInfo)
2622 cifs_put_smb_ses(pSesInfo);
2623 else
2624 cifs_put_tcp_session(srvTcp);
2625 goto out;
2626 }
2627
2628 /* volume_info->password is freed above when existing session found
2629 (in which case it is not needed anymore) but when new sesion is created
2630 the password ptr is put in the new session structure (in which case the
2631 password will be freed at unmount time) */
2632 out:
2633 /* zero out password before freeing */
2634 cleanup_volume_info(&volume_info);
2635 FreeXid(xid);
2636 return rc;
2637 }
2638
2639 int
2640 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2641 const char *tree, struct cifsTconInfo *tcon,
2642 const struct nls_table *nls_codepage)
2643 {
2644 struct smb_hdr *smb_buffer;
2645 struct smb_hdr *smb_buffer_response;
2646 TCONX_REQ *pSMB;
2647 TCONX_RSP *pSMBr;
2648 unsigned char *bcc_ptr;
2649 int rc = 0;
2650 int length, bytes_left;
2651 __u16 count;
2652
2653 if (ses == NULL)
2654 return -EIO;
2655
2656 smb_buffer = cifs_buf_get();
2657 if (smb_buffer == NULL)
2658 return -ENOMEM;
2659
2660 smb_buffer_response = smb_buffer;
2661
2662 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2663 NULL /*no tid */ , 4 /*wct */ );
2664
2665 smb_buffer->Mid = GetNextMid(ses->server);
2666 smb_buffer->Uid = ses->Suid;
2667 pSMB = (TCONX_REQ *) smb_buffer;
2668 pSMBr = (TCONX_RSP *) smb_buffer_response;
2669
2670 pSMB->AndXCommand = 0xFF;
2671 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2672 bcc_ptr = &pSMB->Password[0];
2673 if ((ses->server->secMode) & SECMODE_USER) {
2674 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2675 *bcc_ptr = 0; /* password is null byte */
2676 bcc_ptr++; /* skip password */
2677 /* already aligned so no need to do it below */
2678 } else {
2679 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2680 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2681 specified as required (when that support is added to
2682 the vfs in the future) as only NTLM or the much
2683 weaker LANMAN (which we do not send by default) is accepted
2684 by Samba (not sure whether other servers allow
2685 NTLMv2 password here) */
2686 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2687 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2688 (ses->server->secType == LANMAN))
2689 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2690 ses->server->secMode &
2691 SECMODE_PW_ENCRYPT ? true : false,
2692 bcc_ptr);
2693 else
2694 #endif /* CIFS_WEAK_PW_HASH */
2695 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2696 bcc_ptr);
2697
2698 bcc_ptr += CIFS_SESS_KEY_SIZE;
2699 if (ses->capabilities & CAP_UNICODE) {
2700 /* must align unicode strings */
2701 *bcc_ptr = 0; /* null byte password */
2702 bcc_ptr++;
2703 }
2704 }
2705
2706 if (ses->server->secMode &
2707 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2708 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2709
2710 if (ses->capabilities & CAP_STATUS32) {
2711 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2712 }
2713 if (ses->capabilities & CAP_DFS) {
2714 smb_buffer->Flags2 |= SMBFLG2_DFS;
2715 }
2716 if (ses->capabilities & CAP_UNICODE) {
2717 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2718 length =
2719 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2720 6 /* max utf8 char length in bytes */ *
2721 (/* server len*/ + 256 /* share len */), nls_codepage);
2722 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2723 bcc_ptr += 2; /* skip trailing null */
2724 } else { /* ASCII */
2725 strcpy(bcc_ptr, tree);
2726 bcc_ptr += strlen(tree) + 1;
2727 }
2728 strcpy(bcc_ptr, "?????");
2729 bcc_ptr += strlen("?????");
2730 bcc_ptr += 1;
2731 count = bcc_ptr - &pSMB->Password[0];
2732 pSMB->hdr.smb_buf_length += count;
2733 pSMB->ByteCount = cpu_to_le16(count);
2734
2735 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2736 CIFS_STD_OP);
2737
2738 /* above now done in SendReceive */
2739 if ((rc == 0) && (tcon != NULL)) {
2740 bool is_unicode;
2741
2742 tcon->tidStatus = CifsGood;
2743 tcon->need_reconnect = false;
2744 tcon->tid = smb_buffer_response->Tid;
2745 bcc_ptr = pByteArea(smb_buffer_response);
2746 bytes_left = BCC(smb_buffer_response);
2747 length = strnlen(bcc_ptr, bytes_left - 2);
2748 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2749 is_unicode = true;
2750 else
2751 is_unicode = false;
2752
2753
2754 /* skip service field (NB: this field is always ASCII) */
2755 if (length == 3) {
2756 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2757 (bcc_ptr[2] == 'C')) {
2758 cFYI(1, ("IPC connection"));
2759 tcon->ipc = 1;
2760 }
2761 } else if (length == 2) {
2762 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2763 /* the most common case */
2764 cFYI(1, ("disk share connection"));
2765 }
2766 }
2767 bcc_ptr += length + 1;
2768 bytes_left -= (length + 1);
2769 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2770
2771 /* mostly informational -- no need to fail on error here */
2772 kfree(tcon->nativeFileSystem);
2773 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2774 bytes_left, is_unicode,
2775 nls_codepage);
2776
2777 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2778
2779 if ((smb_buffer_response->WordCount == 3) ||
2780 (smb_buffer_response->WordCount == 7))
2781 /* field is in same location */
2782 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2783 else
2784 tcon->Flags = 0;
2785 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2786 } else if ((rc == 0) && tcon == NULL) {
2787 /* all we need to save for IPC$ connection */
2788 ses->ipc_tid = smb_buffer_response->Tid;
2789 }
2790
2791 cifs_buf_release(smb_buffer);
2792 return rc;
2793 }
2794
2795 int
2796 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2797 {
2798 int rc = 0;
2799 char *tmp;
2800
2801 if (cifs_sb->tcon)
2802 cifs_put_tcon(cifs_sb->tcon);
2803
2804 cifs_sb->tcon = NULL;
2805 tmp = cifs_sb->prepath;
2806 cifs_sb->prepathlen = 0;
2807 cifs_sb->prepath = NULL;
2808 kfree(tmp);
2809
2810 return rc;
2811 }
2812
2813 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2814 struct nls_table *nls_info)
2815 {
2816 int rc = 0;
2817 int first_time = 0;
2818 struct TCP_Server_Info *server = pSesInfo->server;
2819
2820 /* what if server changes its buffer size after dropping the session? */
2821 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2822 rc = CIFSSMBNegotiate(xid, pSesInfo);
2823 if (rc == -EAGAIN) {
2824 /* retry only once on 1st time connection */
2825 rc = CIFSSMBNegotiate(xid, pSesInfo);
2826 if (rc == -EAGAIN)
2827 rc = -EHOSTDOWN;
2828 }
2829 if (rc == 0) {
2830 spin_lock(&GlobalMid_Lock);
2831 if (server->tcpStatus != CifsExiting)
2832 server->tcpStatus = CifsGood;
2833 else
2834 rc = -EHOSTDOWN;
2835 spin_unlock(&GlobalMid_Lock);
2836
2837 }
2838 first_time = 1;
2839 }
2840
2841 if (rc)
2842 goto ss_err_exit;
2843
2844 pSesInfo->flags = 0;
2845 pSesInfo->capabilities = server->capabilities;
2846 if (linuxExtEnabled == 0)
2847 pSesInfo->capabilities &= (~CAP_UNIX);
2848
2849 cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2850 server->secMode, server->capabilities, server->timeAdj));
2851
2852 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2853 if (rc) {
2854 cERROR(1, ("Send error in SessSetup = %d", rc));
2855 } else {
2856 cFYI(1, ("CIFS Session Established successfully"));
2857 spin_lock(&GlobalMid_Lock);
2858 pSesInfo->status = CifsGood;
2859 pSesInfo->need_reconnect = false;
2860 spin_unlock(&GlobalMid_Lock);
2861 }
2862
2863 ss_err_exit:
2864 return rc;
2865 }
2866
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