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Staging: strip: add TODO file
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blob43003e0bef18606947a67315472519602e6a912f
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 kfree(tcp_ses->hostname);
1581 if (tcp_ses->ssocket)
1582 sock_release(tcp_ses->ssocket);
1583 kfree(tcp_ses);
1584 }
1585 return ERR_PTR(rc);
1586 }
1587
1588 static struct cifsSesInfo *
1589 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1590 {
1591 struct list_head *tmp;
1592 struct cifsSesInfo *ses;
1593
1594 write_lock(&cifs_tcp_ses_lock);
1595 list_for_each(tmp, &server->smb_ses_list) {
1596 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1597 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1598 continue;
1599
1600 ++ses->ses_count;
1601 write_unlock(&cifs_tcp_ses_lock);
1602 return ses;
1603 }
1604 write_unlock(&cifs_tcp_ses_lock);
1605 return NULL;
1606 }
1607
1608 static void
1609 cifs_put_smb_ses(struct cifsSesInfo *ses)
1610 {
1611 int xid;
1612 struct TCP_Server_Info *server = ses->server;
1613
1614 write_lock(&cifs_tcp_ses_lock);
1615 if (--ses->ses_count > 0) {
1616 write_unlock(&cifs_tcp_ses_lock);
1617 return;
1618 }
1619
1620 list_del_init(&ses->smb_ses_list);
1621 write_unlock(&cifs_tcp_ses_lock);
1622
1623 if (ses->status == CifsGood) {
1624 xid = GetXid();
1625 CIFSSMBLogoff(xid, ses);
1626 _FreeXid(xid);
1627 }
1628 sesInfoFree(ses);
1629 cifs_put_tcp_session(server);
1630 }
1631
1632 static struct cifsTconInfo *
1633 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1634 {
1635 struct list_head *tmp;
1636 struct cifsTconInfo *tcon;
1637
1638 write_lock(&cifs_tcp_ses_lock);
1639 list_for_each(tmp, &ses->tcon_list) {
1640 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1641 if (tcon->tidStatus == CifsExiting)
1642 continue;
1643 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1644 continue;
1645
1646 ++tcon->tc_count;
1647 write_unlock(&cifs_tcp_ses_lock);
1648 return tcon;
1649 }
1650 write_unlock(&cifs_tcp_ses_lock);
1651 return NULL;
1652 }
1653
1654 static void
1655 cifs_put_tcon(struct cifsTconInfo *tcon)
1656 {
1657 int xid;
1658 struct cifsSesInfo *ses = tcon->ses;
1659
1660 write_lock(&cifs_tcp_ses_lock);
1661 if (--tcon->tc_count > 0) {
1662 write_unlock(&cifs_tcp_ses_lock);
1663 return;
1664 }
1665
1666 list_del_init(&tcon->tcon_list);
1667 write_unlock(&cifs_tcp_ses_lock);
1668
1669 xid = GetXid();
1670 CIFSSMBTDis(xid, tcon);
1671 _FreeXid(xid);
1672
1673 tconInfoFree(tcon);
1674 cifs_put_smb_ses(ses);
1675 }
1676
1677 int
1678 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1679 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1680 struct dfs_info3_param **preferrals, int remap)
1681 {
1682 char *temp_unc;
1683 int rc = 0;
1684
1685 *pnum_referrals = 0;
1686 *preferrals = NULL;
1687
1688 if (pSesInfo->ipc_tid == 0) {
1689 temp_unc = kmalloc(2 /* for slashes */ +
1690 strnlen(pSesInfo->serverName,
1691 SERVER_NAME_LEN_WITH_NULL * 2)
1692 + 1 + 4 /* slash IPC$ */ + 2,
1693 GFP_KERNEL);
1694 if (temp_unc == NULL)
1695 return -ENOMEM;
1696 temp_unc[0] = '\\';
1697 temp_unc[1] = '\\';
1698 strcpy(temp_unc + 2, pSesInfo->serverName);
1699 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1700 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1701 cFYI(1,
1702 ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1703 kfree(temp_unc);
1704 }
1705 if (rc == 0)
1706 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1707 pnum_referrals, nls_codepage, remap);
1708 /* BB map targetUNCs to dfs_info3 structures, here or
1709 in CIFSGetDFSRefer BB */
1710
1711 return rc;
1712 }
1713
1714 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1715 static struct lock_class_key cifs_key[2];
1716 static struct lock_class_key cifs_slock_key[2];
1717
1718 static inline void
1719 cifs_reclassify_socket4(struct socket *sock)
1720 {
1721 struct sock *sk = sock->sk;
1722 BUG_ON(sock_owned_by_user(sk));
1723 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1724 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1725 }
1726
1727 static inline void
1728 cifs_reclassify_socket6(struct socket *sock)
1729 {
1730 struct sock *sk = sock->sk;
1731 BUG_ON(sock_owned_by_user(sk));
1732 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1733 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1734 }
1735 #else
1736 static inline void
1737 cifs_reclassify_socket4(struct socket *sock)
1738 {
1739 }
1740
1741 static inline void
1742 cifs_reclassify_socket6(struct socket *sock)
1743 {
1744 }
1745 #endif
1746
1747 /* See RFC1001 section 14 on representation of Netbios names */
1748 static void rfc1002mangle(char *target, char *source, unsigned int length)
1749 {
1750 unsigned int i, j;
1751
1752 for (i = 0, j = 0; i < (length); i++) {
1753 /* mask a nibble at a time and encode */
1754 target[j] = 'A' + (0x0F & (source[i] >> 4));
1755 target[j+1] = 'A' + (0x0F & source[i]);
1756 j += 2;
1757 }
1758
1759 }
1760
1761
1762 static int
1763 ipv4_connect(struct TCP_Server_Info *server)
1764 {
1765 int rc = 0;
1766 bool connected = false;
1767 __be16 orig_port = 0;
1768 struct socket *socket = server->ssocket;
1769
1770 if (socket == NULL) {
1771 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1772 IPPROTO_TCP, &socket);
1773 if (rc < 0) {
1774 cERROR(1, ("Error %d creating socket", rc));
1775 return rc;
1776 }
1777
1778 /* BB other socket options to set KEEPALIVE, NODELAY? */
1779 cFYI(1, ("Socket created"));
1780 server->ssocket = socket;
1781 socket->sk->sk_allocation = GFP_NOFS;
1782 cifs_reclassify_socket4(socket);
1783 }
1784
1785 /* user overrode default port */
1786 if (server->addr.sockAddr.sin_port) {
1787 rc = socket->ops->connect(socket, (struct sockaddr *)
1788 &server->addr.sockAddr,
1789 sizeof(struct sockaddr_in), 0);
1790 if (rc >= 0)
1791 connected = true;
1792 }
1793
1794 if (!connected) {
1795 /* save original port so we can retry user specified port
1796 later if fall back ports fail this time */
1797 orig_port = server->addr.sockAddr.sin_port;
1798
1799 /* do not retry on the same port we just failed on */
1800 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1801 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1802 rc = socket->ops->connect(socket,
1803 (struct sockaddr *)
1804 &server->addr.sockAddr,
1805 sizeof(struct sockaddr_in), 0);
1806 if (rc >= 0)
1807 connected = true;
1808 }
1809 }
1810 if (!connected) {
1811 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1812 rc = socket->ops->connect(socket, (struct sockaddr *)
1813 &server->addr.sockAddr,
1814 sizeof(struct sockaddr_in), 0);
1815 if (rc >= 0)
1816 connected = true;
1817 }
1818
1819 /* give up here - unless we want to retry on different
1820 protocol families some day */
1821 if (!connected) {
1822 if (orig_port)
1823 server->addr.sockAddr.sin_port = orig_port;
1824 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1825 sock_release(socket);
1826 server->ssocket = NULL;
1827 return rc;
1828 }
1829
1830
1831 /*
1832 * Eventually check for other socket options to change from
1833 * the default. sock_setsockopt not used because it expects
1834 * user space buffer
1835 */
1836 socket->sk->sk_rcvtimeo = 7 * HZ;
1837 socket->sk->sk_sndtimeo = 5 * HZ;
1838
1839 /* make the bufsizes depend on wsize/rsize and max requests */
1840 if (server->noautotune) {
1841 if (socket->sk->sk_sndbuf < (200 * 1024))
1842 socket->sk->sk_sndbuf = 200 * 1024;
1843 if (socket->sk->sk_rcvbuf < (140 * 1024))
1844 socket->sk->sk_rcvbuf = 140 * 1024;
1845 }
1846
1847 cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1848 socket->sk->sk_sndbuf,
1849 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1850
1851 /* send RFC1001 sessinit */
1852 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1853 /* some servers require RFC1001 sessinit before sending
1854 negprot - BB check reconnection in case where second
1855 sessinit is sent but no second negprot */
1856 struct rfc1002_session_packet *ses_init_buf;
1857 struct smb_hdr *smb_buf;
1858 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1859 GFP_KERNEL);
1860 if (ses_init_buf) {
1861 ses_init_buf->trailer.session_req.called_len = 32;
1862 if (server->server_RFC1001_name &&
1863 server->server_RFC1001_name[0] != 0)
1864 rfc1002mangle(ses_init_buf->trailer.
1865 session_req.called_name,
1866 server->server_RFC1001_name,
1867 RFC1001_NAME_LEN_WITH_NULL);
1868 else
1869 rfc1002mangle(ses_init_buf->trailer.
1870 session_req.called_name,
1871 DEFAULT_CIFS_CALLED_NAME,
1872 RFC1001_NAME_LEN_WITH_NULL);
1873
1874 ses_init_buf->trailer.session_req.calling_len = 32;
1875
1876 /* calling name ends in null (byte 16) from old smb
1877 convention. */
1878 if (server->workstation_RFC1001_name &&
1879 server->workstation_RFC1001_name[0] != 0)
1880 rfc1002mangle(ses_init_buf->trailer.
1881 session_req.calling_name,
1882 server->workstation_RFC1001_name,
1883 RFC1001_NAME_LEN_WITH_NULL);
1884 else
1885 rfc1002mangle(ses_init_buf->trailer.
1886 session_req.calling_name,
1887 "LINUX_CIFS_CLNT",
1888 RFC1001_NAME_LEN_WITH_NULL);
1889
1890 ses_init_buf->trailer.session_req.scope1 = 0;
1891 ses_init_buf->trailer.session_req.scope2 = 0;
1892 smb_buf = (struct smb_hdr *)ses_init_buf;
1893 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1894 smb_buf->smb_buf_length = 0x81000044;
1895 rc = smb_send(server, smb_buf, 0x44);
1896 kfree(ses_init_buf);
1897 msleep(1); /* RFC1001 layer in at least one server
1898 requires very short break before negprot
1899 presumably because not expecting negprot
1900 to follow so fast. This is a simple
1901 solution that works without
1902 complicating the code and causes no
1903 significant slowing down on mount
1904 for everyone else */
1905 }
1906 /* else the negprot may still work without this
1907 even though malloc failed */
1908
1909 }
1910
1911 return rc;
1912 }
1913
1914 static int
1915 ipv6_connect(struct TCP_Server_Info *server)
1916 {
1917 int rc = 0;
1918 bool connected = false;
1919 __be16 orig_port = 0;
1920 struct socket *socket = server->ssocket;
1921
1922 if (socket == NULL) {
1923 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1924 IPPROTO_TCP, &socket);
1925 if (rc < 0) {
1926 cERROR(1, ("Error %d creating ipv6 socket", rc));
1927 socket = NULL;
1928 return rc;
1929 }
1930
1931 /* BB other socket options to set KEEPALIVE, NODELAY? */
1932 cFYI(1, ("ipv6 Socket created"));
1933 server->ssocket = socket;
1934 socket->sk->sk_allocation = GFP_NOFS;
1935 cifs_reclassify_socket6(socket);
1936 }
1937
1938 /* user overrode default port */
1939 if (server->addr.sockAddr6.sin6_port) {
1940 rc = socket->ops->connect(socket,
1941 (struct sockaddr *) &server->addr.sockAddr6,
1942 sizeof(struct sockaddr_in6), 0);
1943 if (rc >= 0)
1944 connected = true;
1945 }
1946
1947 if (!connected) {
1948 /* save original port so we can retry user specified port
1949 later if fall back ports fail this time */
1950
1951 orig_port = server->addr.sockAddr6.sin6_port;
1952 /* do not retry on the same port we just failed on */
1953 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1954 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1955 rc = socket->ops->connect(socket, (struct sockaddr *)
1956 &server->addr.sockAddr6,
1957 sizeof(struct sockaddr_in6), 0);
1958 if (rc >= 0)
1959 connected = true;
1960 }
1961 }
1962 if (!connected) {
1963 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1964 rc = socket->ops->connect(socket, (struct sockaddr *)
1965 &server->addr.sockAddr6,
1966 sizeof(struct sockaddr_in6), 0);
1967 if (rc >= 0)
1968 connected = true;
1969 }
1970
1971 /* give up here - unless we want to retry on different
1972 protocol families some day */
1973 if (!connected) {
1974 if (orig_port)
1975 server->addr.sockAddr6.sin6_port = orig_port;
1976 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1977 sock_release(socket);
1978 server->ssocket = NULL;
1979 return rc;
1980 }
1981
1982 /*
1983 * Eventually check for other socket options to change from
1984 * the default. sock_setsockopt not used because it expects
1985 * user space buffer
1986 */
1987 socket->sk->sk_rcvtimeo = 7 * HZ;
1988 socket->sk->sk_sndtimeo = 5 * HZ;
1989 server->ssocket = socket;
1990
1991 return rc;
1992 }
1993
1994 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1995 struct super_block *sb, struct smb_vol *vol_info)
1996 {
1997 /* if we are reconnecting then should we check to see if
1998 * any requested capabilities changed locally e.g. via
1999 * remount but we can not do much about it here
2000 * if they have (even if we could detect it by the following)
2001 * Perhaps we could add a backpointer to array of sb from tcon
2002 * or if we change to make all sb to same share the same
2003 * sb as NFS - then we only have one backpointer to sb.
2004 * What if we wanted to mount the server share twice once with
2005 * and once without posixacls or posix paths? */
2006 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2007
2008 if (vol_info && vol_info->no_linux_ext) {
2009 tcon->fsUnixInfo.Capability = 0;
2010 tcon->unix_ext = 0; /* Unix Extensions disabled */
2011 cFYI(1, ("Linux protocol extensions disabled"));
2012 return;
2013 } else if (vol_info)
2014 tcon->unix_ext = 1; /* Unix Extensions supported */
2015
2016 if (tcon->unix_ext == 0) {
2017 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
2018 return;
2019 }
2020
2021 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2022 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2023
2024 /* check for reconnect case in which we do not
2025 want to change the mount behavior if we can avoid it */
2026 if (vol_info == NULL) {
2027 /* turn off POSIX ACL and PATHNAMES if not set
2028 originally at mount time */
2029 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2030 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2031 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2032 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2033 cERROR(1, ("POSIXPATH support change"));
2034 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2035 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2036 cERROR(1, ("possible reconnect error"));
2037 cERROR(1,
2038 ("server disabled POSIX path support"));
2039 }
2040 }
2041
2042 cap &= CIFS_UNIX_CAP_MASK;
2043 if (vol_info && vol_info->no_psx_acl)
2044 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2045 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2046 cFYI(1, ("negotiated posix acl support"));
2047 if (sb)
2048 sb->s_flags |= MS_POSIXACL;
2049 }
2050
2051 if (vol_info && vol_info->posix_paths == 0)
2052 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2053 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2054 cFYI(1, ("negotiate posix pathnames"));
2055 if (sb)
2056 CIFS_SB(sb)->mnt_cifs_flags |=
2057 CIFS_MOUNT_POSIX_PATHS;
2058 }
2059
2060 /* We might be setting the path sep back to a different
2061 form if we are reconnecting and the server switched its
2062 posix path capability for this share */
2063 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2064 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2065
2066 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2067 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2068 CIFS_SB(sb)->rsize = 127 * 1024;
2069 cFYI(DBG2,
2070 ("larger reads not supported by srv"));
2071 }
2072 }
2073
2074
2075 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2076 #ifdef CONFIG_CIFS_DEBUG2
2077 if (cap & CIFS_UNIX_FCNTL_CAP)
2078 cFYI(1, ("FCNTL cap"));
2079 if (cap & CIFS_UNIX_EXTATTR_CAP)
2080 cFYI(1, ("EXTATTR cap"));
2081 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2082 cFYI(1, ("POSIX path cap"));
2083 if (cap & CIFS_UNIX_XATTR_CAP)
2084 cFYI(1, ("XATTR cap"));
2085 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2086 cFYI(1, ("POSIX ACL cap"));
2087 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2088 cFYI(1, ("very large read cap"));
2089 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2090 cFYI(1, ("very large write cap"));
2091 #endif /* CIFS_DEBUG2 */
2092 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2093 if (vol_info == NULL) {
2094 cFYI(1, ("resetting capabilities failed"));
2095 } else
2096 cERROR(1, ("Negotiating Unix capabilities "
2097 "with the server failed. Consider "
2098 "mounting with the Unix Extensions\n"
2099 "disabled, if problems are found, "
2100 "by specifying the nounix mount "
2101 "option."));
2102
2103 }
2104 }
2105 }
2106
2107 static void
2108 convert_delimiter(char *path, char delim)
2109 {
2110 int i;
2111 char old_delim;
2112
2113 if (path == NULL)
2114 return;
2115
2116 if (delim == '/')
2117 old_delim = '\\';
2118 else
2119 old_delim = '/';
2120
2121 for (i = 0; path[i] != '\0'; i++) {
2122 if (path[i] == old_delim)
2123 path[i] = delim;
2124 }
2125 }
2126
2127 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2128 struct cifs_sb_info *cifs_sb)
2129 {
2130 if (pvolume_info->rsize > CIFSMaxBufSize) {
2131 cERROR(1, ("rsize %d too large, using MaxBufSize",
2132 pvolume_info->rsize));
2133 cifs_sb->rsize = CIFSMaxBufSize;
2134 } else if ((pvolume_info->rsize) &&
2135 (pvolume_info->rsize <= CIFSMaxBufSize))
2136 cifs_sb->rsize = pvolume_info->rsize;
2137 else /* default */
2138 cifs_sb->rsize = CIFSMaxBufSize;
2139
2140 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2141 cERROR(1, ("wsize %d too large, using 4096 instead",
2142 pvolume_info->wsize));
2143 cifs_sb->wsize = 4096;
2144 } else if (pvolume_info->wsize)
2145 cifs_sb->wsize = pvolume_info->wsize;
2146 else
2147 cifs_sb->wsize = min_t(const int,
2148 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2149 127*1024);
2150 /* old default of CIFSMaxBufSize was too small now
2151 that SMB Write2 can send multiple pages in kvec.
2152 RFC1001 does not describe what happens when frame
2153 bigger than 128K is sent so use that as max in
2154 conjunction with 52K kvec constraint on arch with 4K
2155 page size */
2156
2157 if (cifs_sb->rsize < 2048) {
2158 cifs_sb->rsize = 2048;
2159 /* Windows ME may prefer this */
2160 cFYI(1, ("readsize set to minimum: 2048"));
2161 }
2162 /* calculate prepath */
2163 cifs_sb->prepath = pvolume_info->prepath;
2164 if (cifs_sb->prepath) {
2165 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2166 /* we can not convert the / to \ in the path
2167 separators in the prefixpath yet because we do not
2168 know (until reset_cifs_unix_caps is called later)
2169 whether POSIX PATH CAP is available. We normalize
2170 the / to \ after reset_cifs_unix_caps is called */
2171 pvolume_info->prepath = NULL;
2172 } else
2173 cifs_sb->prepathlen = 0;
2174 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2175 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2176 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2177 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2178 cFYI(1, ("file mode: 0x%x dir mode: 0x%x",
2179 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2180
2181 if (pvolume_info->noperm)
2182 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2183 if (pvolume_info->setuids)
2184 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2185 if (pvolume_info->server_ino)
2186 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2187 if (pvolume_info->remap)
2188 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2189 if (pvolume_info->no_xattr)
2190 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2191 if (pvolume_info->sfu_emul)
2192 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2193 if (pvolume_info->nobrl)
2194 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2195 if (pvolume_info->nostrictsync)
2196 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2197 if (pvolume_info->mand_lock)
2198 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2199 if (pvolume_info->cifs_acl)
2200 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2201 if (pvolume_info->override_uid)
2202 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2203 if (pvolume_info->override_gid)
2204 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2205 if (pvolume_info->dynperm)
2206 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2207 if (pvolume_info->direct_io) {
2208 cFYI(1, ("mounting share using direct i/o"));
2209 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2210 }
2211
2212 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2213 cERROR(1, ("mount option dynperm ignored if cifsacl "
2214 "mount option supported"));
2215 }
2216
2217 static int
2218 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2219 struct cifs_sb_info *cifs_sb, const char *full_path)
2220 {
2221 int rc;
2222 __u64 inode_num;
2223 FILE_ALL_INFO *pfile_info;
2224
2225 rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2226 cifs_sb->local_nls,
2227 cifs_sb->mnt_cifs_flags &
2228 CIFS_MOUNT_MAP_SPECIAL_CHR);
2229 if (rc != -EOPNOTSUPP)
2230 return rc;
2231
2232 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2233 if (pfile_info == NULL)
2234 return -ENOMEM;
2235
2236 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2237 0 /* not legacy */, cifs_sb->local_nls,
2238 cifs_sb->mnt_cifs_flags &
2239 CIFS_MOUNT_MAP_SPECIAL_CHR);
2240 kfree(pfile_info);
2241 return rc;
2242 }
2243
2244 static void
2245 cleanup_volume_info(struct smb_vol **pvolume_info)
2246 {
2247 struct smb_vol *volume_info;
2248
2249 if (!pvolume_info && !*pvolume_info)
2250 return;
2251
2252 volume_info = *pvolume_info;
2253 kzfree(volume_info->password);
2254 kfree(volume_info->UNC);
2255 kfree(volume_info->prepath);
2256 kfree(volume_info);
2257 *pvolume_info = NULL;
2258 return;
2259 }
2260
2261 #ifdef CONFIG_CIFS_DFS_UPCALL
2262 /* build_path_to_root returns full path to root when
2263 * we do not have an exiting connection (tcon) */
2264 static char *
2265 build_unc_path_to_root(const struct smb_vol *volume_info,
2266 const struct cifs_sb_info *cifs_sb)
2267 {
2268 char *full_path;
2269
2270 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2271 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2272 if (full_path == NULL)
2273 return ERR_PTR(-ENOMEM);
2274
2275 strncpy(full_path, volume_info->UNC, unc_len);
2276 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2277 int i;
2278 for (i = 0; i < unc_len; i++) {
2279 if (full_path[i] == '\\')
2280 full_path[i] = '/';
2281 }
2282 }
2283
2284 if (cifs_sb->prepathlen)
2285 strncpy(full_path + unc_len, cifs_sb->prepath,
2286 cifs_sb->prepathlen);
2287
2288 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2289 return full_path;
2290 }
2291 #endif
2292
2293 int
2294 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2295 char *mount_data_global, const char *devname)
2296 {
2297 int rc = 0;
2298 int xid;
2299 struct smb_vol *volume_info;
2300 struct cifsSesInfo *pSesInfo = NULL;
2301 struct cifsTconInfo *tcon = NULL;
2302 struct TCP_Server_Info *srvTcp = NULL;
2303 char *full_path;
2304 char *mount_data = mount_data_global;
2305 #ifdef CONFIG_CIFS_DFS_UPCALL
2306 struct dfs_info3_param *referrals = NULL;
2307 unsigned int num_referrals = 0;
2308 int referral_walks_count = 0;
2309 try_mount_again:
2310 #endif
2311 full_path = NULL;
2312
2313 xid = GetXid();
2314
2315 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2316 if (!volume_info) {
2317 rc = -ENOMEM;
2318 goto out;
2319 }
2320
2321 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2322 rc = -EINVAL;
2323 goto out;
2324 }
2325
2326 if (volume_info->nullauth) {
2327 cFYI(1, ("null user"));
2328 volume_info->username = "";
2329 } else if (volume_info->username) {
2330 /* BB fixme parse for domain name here */
2331 cFYI(1, ("Username: %s", volume_info->username));
2332 } else {
2333 cifserror("No username specified");
2334 /* In userspace mount helper we can get user name from alternate
2335 locations such as env variables and files on disk */
2336 rc = -EINVAL;
2337 goto out;
2338 }
2339
2340
2341 /* this is needed for ASCII cp to Unicode converts */
2342 if (volume_info->iocharset == NULL) {
2343 cifs_sb->local_nls = load_nls_default();
2344 /* load_nls_default can not return null */
2345 } else {
2346 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2347 if (cifs_sb->local_nls == NULL) {
2348 cERROR(1, ("CIFS mount error: iocharset %s not found",
2349 volume_info->iocharset));
2350 rc = -ELIBACC;
2351 goto out;
2352 }
2353 }
2354
2355 /* get a reference to a tcp session */
2356 srvTcp = cifs_get_tcp_session(volume_info);
2357 if (IS_ERR(srvTcp)) {
2358 rc = PTR_ERR(srvTcp);
2359 goto out;
2360 }
2361
2362 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2363 if (pSesInfo) {
2364 cFYI(1, ("Existing smb sess found (status=%d)",
2365 pSesInfo->status));
2366 /*
2367 * The existing SMB session already has a reference to srvTcp,
2368 * so we can put back the extra one we got before
2369 */
2370 cifs_put_tcp_session(srvTcp);
2371
2372 down(&pSesInfo->sesSem);
2373 if (pSesInfo->need_reconnect) {
2374 cFYI(1, ("Session needs reconnect"));
2375 rc = cifs_setup_session(xid, pSesInfo,
2376 cifs_sb->local_nls);
2377 }
2378 up(&pSesInfo->sesSem);
2379 } else if (!rc) {
2380 cFYI(1, ("Existing smb sess not found"));
2381 pSesInfo = sesInfoAlloc();
2382 if (pSesInfo == NULL) {
2383 rc = -ENOMEM;
2384 goto mount_fail_check;
2385 }
2386
2387 /* new SMB session uses our srvTcp ref */
2388 pSesInfo->server = srvTcp;
2389 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2390 sprintf(pSesInfo->serverName, "%pI6",
2391 &srvTcp->addr.sockAddr6.sin6_addr);
2392 else
2393 sprintf(pSesInfo->serverName, "%pI4",
2394 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2395
2396 write_lock(&cifs_tcp_ses_lock);
2397 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2398 write_unlock(&cifs_tcp_ses_lock);
2399
2400 /* volume_info->password freed at unmount */
2401 if (volume_info->password) {
2402 pSesInfo->password = kstrdup(volume_info->password,
2403 GFP_KERNEL);
2404 if (!pSesInfo->password) {
2405 rc = -ENOMEM;
2406 goto mount_fail_check;
2407 }
2408 }
2409 if (volume_info->username)
2410 strncpy(pSesInfo->userName, volume_info->username,
2411 MAX_USERNAME_SIZE);
2412 if (volume_info->domainname) {
2413 int len = strlen(volume_info->domainname);
2414 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2415 if (pSesInfo->domainName)
2416 strcpy(pSesInfo->domainName,
2417 volume_info->domainname);
2418 }
2419 pSesInfo->linux_uid = volume_info->linux_uid;
2420 pSesInfo->overrideSecFlg = volume_info->secFlg;
2421 down(&pSesInfo->sesSem);
2422
2423 /* BB FIXME need to pass vol->secFlgs BB */
2424 rc = cifs_setup_session(xid, pSesInfo,
2425 cifs_sb->local_nls);
2426 up(&pSesInfo->sesSem);
2427 }
2428
2429 /* search for existing tcon to this server share */
2430 if (!rc) {
2431 setup_cifs_sb(volume_info, cifs_sb);
2432
2433 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2434 if (tcon) {
2435 cFYI(1, ("Found match on UNC path"));
2436 /* existing tcon already has a reference */
2437 cifs_put_smb_ses(pSesInfo);
2438 if (tcon->seal != volume_info->seal)
2439 cERROR(1, ("transport encryption setting "
2440 "conflicts with existing tid"));
2441 } else {
2442 tcon = tconInfoAlloc();
2443 if (tcon == NULL) {
2444 rc = -ENOMEM;
2445 goto mount_fail_check;
2446 }
2447
2448 tcon->ses = pSesInfo;
2449 if (volume_info->password) {
2450 tcon->password = kstrdup(volume_info->password,
2451 GFP_KERNEL);
2452 if (!tcon->password) {
2453 rc = -ENOMEM;
2454 goto mount_fail_check;
2455 }
2456 }
2457
2458 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2459 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2460 cERROR(1, ("Missing share name"));
2461 rc = -ENODEV;
2462 goto mount_fail_check;
2463 } else {
2464 /* BB Do we need to wrap sesSem around
2465 * this TCon call and Unix SetFS as
2466 * we do on SessSetup and reconnect? */
2467 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2468 tcon, cifs_sb->local_nls);
2469 cFYI(1, ("CIFS Tcon rc = %d", rc));
2470 if (volume_info->nodfs) {
2471 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2472 cFYI(1, ("DFS disabled (%d)",
2473 tcon->Flags));
2474 }
2475 }
2476 if (rc)
2477 goto remote_path_check;
2478 tcon->seal = volume_info->seal;
2479 write_lock(&cifs_tcp_ses_lock);
2480 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2481 write_unlock(&cifs_tcp_ses_lock);
2482 }
2483
2484 /* we can have only one retry value for a connection
2485 to a share so for resources mounted more than once
2486 to the same server share the last value passed in
2487 for the retry flag is used */
2488 tcon->retry = volume_info->retry;
2489 tcon->nocase = volume_info->nocase;
2490 tcon->local_lease = volume_info->local_lease;
2491 }
2492 if (pSesInfo) {
2493 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2494 sb->s_maxbytes = MAX_LFS_FILESIZE;
2495 else
2496 sb->s_maxbytes = MAX_NON_LFS;
2497 }
2498
2499 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2500 sb->s_time_gran = 100;
2501
2502 if (rc)
2503 goto remote_path_check;
2504
2505 cifs_sb->tcon = tcon;
2506
2507 /* do not care if following two calls succeed - informational */
2508 if (!tcon->ipc) {
2509 CIFSSMBQFSDeviceInfo(xid, tcon);
2510 CIFSSMBQFSAttributeInfo(xid, tcon);
2511 }
2512
2513 /* tell server which Unix caps we support */
2514 if (tcon->ses->capabilities & CAP_UNIX)
2515 /* reset of caps checks mount to see if unix extensions
2516 disabled for just this mount */
2517 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2518 else
2519 tcon->unix_ext = 0; /* server does not support them */
2520
2521 /* convert forward to back slashes in prepath here if needed */
2522 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2523 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2524
2525 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2526 cifs_sb->rsize = 1024 * 127;
2527 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2528 }
2529 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2530 cifs_sb->wsize = min(cifs_sb->wsize,
2531 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2532 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2533 cifs_sb->rsize = min(cifs_sb->rsize,
2534 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2535
2536 remote_path_check:
2537 /* check if a whole path (including prepath) is not remote */
2538 if (!rc && cifs_sb->prepathlen && tcon) {
2539 /* build_path_to_root works only when we have a valid tcon */
2540 full_path = cifs_build_path_to_root(cifs_sb);
2541 if (full_path == NULL) {
2542 rc = -ENOMEM;
2543 goto mount_fail_check;
2544 }
2545 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2546 if (rc != -EREMOTE) {
2547 kfree(full_path);
2548 goto mount_fail_check;
2549 }
2550 kfree(full_path);
2551 }
2552
2553 /* get referral if needed */
2554 if (rc == -EREMOTE) {
2555 #ifdef CONFIG_CIFS_DFS_UPCALL
2556 if (referral_walks_count > MAX_NESTED_LINKS) {
2557 /*
2558 * BB: when we implement proper loop detection,
2559 * we will remove this check. But now we need it
2560 * to prevent an indefinite loop if 'DFS tree' is
2561 * misconfigured (i.e. has loops).
2562 */
2563 rc = -ELOOP;
2564 goto mount_fail_check;
2565 }
2566 /* convert forward to back slashes in prepath here if needed */
2567 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2568 convert_delimiter(cifs_sb->prepath,
2569 CIFS_DIR_SEP(cifs_sb));
2570 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2571 if (IS_ERR(full_path)) {
2572 rc = PTR_ERR(full_path);
2573 goto mount_fail_check;
2574 }
2575
2576 cFYI(1, ("Getting referral for: %s", full_path));
2577 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2578 cifs_sb->local_nls, &num_referrals, &referrals,
2579 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2580 if (!rc && num_referrals > 0) {
2581 char *fake_devname = NULL;
2582
2583 if (mount_data != mount_data_global)
2584 kfree(mount_data);
2585
2586 mount_data = cifs_compose_mount_options(
2587 cifs_sb->mountdata, full_path + 1,
2588 referrals, &fake_devname);
2589
2590 free_dfs_info_array(referrals, num_referrals);
2591 kfree(fake_devname);
2592 kfree(full_path);
2593
2594 if (IS_ERR(mount_data)) {
2595 rc = PTR_ERR(mount_data);
2596 mount_data = NULL;
2597 goto mount_fail_check;
2598 }
2599
2600 if (tcon)
2601 cifs_put_tcon(tcon);
2602 else if (pSesInfo)
2603 cifs_put_smb_ses(pSesInfo);
2604
2605 cleanup_volume_info(&volume_info);
2606 referral_walks_count++;
2607 goto try_mount_again;
2608 }
2609 #else /* No DFS support, return error on mount */
2610 rc = -EOPNOTSUPP;
2611 #endif
2612 }
2613
2614 mount_fail_check:
2615 /* on error free sesinfo and tcon struct if needed */
2616 if (rc) {
2617 if (mount_data != mount_data_global)
2618 kfree(mount_data);
2619 /* If find_unc succeeded then rc == 0 so we can not end */
2620 /* up accidently freeing someone elses tcon struct */
2621 if (tcon)
2622 cifs_put_tcon(tcon);
2623 else if (pSesInfo)
2624 cifs_put_smb_ses(pSesInfo);
2625 else
2626 cifs_put_tcp_session(srvTcp);
2627 goto out;
2628 }
2629
2630 /* volume_info->password is freed above when existing session found
2631 (in which case it is not needed anymore) but when new sesion is created
2632 the password ptr is put in the new session structure (in which case the
2633 password will be freed at unmount time) */
2634 out:
2635 /* zero out password before freeing */
2636 cleanup_volume_info(&volume_info);
2637 FreeXid(xid);
2638 return rc;
2639 }
2640
2641 int
2642 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2643 const char *tree, struct cifsTconInfo *tcon,
2644 const struct nls_table *nls_codepage)
2645 {
2646 struct smb_hdr *smb_buffer;
2647 struct smb_hdr *smb_buffer_response;
2648 TCONX_REQ *pSMB;
2649 TCONX_RSP *pSMBr;
2650 unsigned char *bcc_ptr;
2651 int rc = 0;
2652 int length, bytes_left;
2653 __u16 count;
2654
2655 if (ses == NULL)
2656 return -EIO;
2657
2658 smb_buffer = cifs_buf_get();
2659 if (smb_buffer == NULL)
2660 return -ENOMEM;
2661
2662 smb_buffer_response = smb_buffer;
2663
2664 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2665 NULL /*no tid */ , 4 /*wct */ );
2666
2667 smb_buffer->Mid = GetNextMid(ses->server);
2668 smb_buffer->Uid = ses->Suid;
2669 pSMB = (TCONX_REQ *) smb_buffer;
2670 pSMBr = (TCONX_RSP *) smb_buffer_response;
2671
2672 pSMB->AndXCommand = 0xFF;
2673 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2674 bcc_ptr = &pSMB->Password[0];
2675 if ((ses->server->secMode) & SECMODE_USER) {
2676 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2677 *bcc_ptr = 0; /* password is null byte */
2678 bcc_ptr++; /* skip password */
2679 /* already aligned so no need to do it below */
2680 } else {
2681 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2682 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2683 specified as required (when that support is added to
2684 the vfs in the future) as only NTLM or the much
2685 weaker LANMAN (which we do not send by default) is accepted
2686 by Samba (not sure whether other servers allow
2687 NTLMv2 password here) */
2688 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2689 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2690 (ses->server->secType == LANMAN))
2691 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2692 ses->server->secMode &
2693 SECMODE_PW_ENCRYPT ? true : false,
2694 bcc_ptr);
2695 else
2696 #endif /* CIFS_WEAK_PW_HASH */
2697 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2698 bcc_ptr);
2699
2700 bcc_ptr += CIFS_SESS_KEY_SIZE;
2701 if (ses->capabilities & CAP_UNICODE) {
2702 /* must align unicode strings */
2703 *bcc_ptr = 0; /* null byte password */
2704 bcc_ptr++;
2705 }
2706 }
2707
2708 if (ses->server->secMode &
2709 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2710 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2711
2712 if (ses->capabilities & CAP_STATUS32) {
2713 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2714 }
2715 if (ses->capabilities & CAP_DFS) {
2716 smb_buffer->Flags2 |= SMBFLG2_DFS;
2717 }
2718 if (ses->capabilities & CAP_UNICODE) {
2719 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2720 length =
2721 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2722 6 /* max utf8 char length in bytes */ *
2723 (/* server len*/ + 256 /* share len */), nls_codepage);
2724 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2725 bcc_ptr += 2; /* skip trailing null */
2726 } else { /* ASCII */
2727 strcpy(bcc_ptr, tree);
2728 bcc_ptr += strlen(tree) + 1;
2729 }
2730 strcpy(bcc_ptr, "?????");
2731 bcc_ptr += strlen("?????");
2732 bcc_ptr += 1;
2733 count = bcc_ptr - &pSMB->Password[0];
2734 pSMB->hdr.smb_buf_length += count;
2735 pSMB->ByteCount = cpu_to_le16(count);
2736
2737 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2738 CIFS_STD_OP);
2739
2740 /* above now done in SendReceive */
2741 if ((rc == 0) && (tcon != NULL)) {
2742 bool is_unicode;
2743
2744 tcon->tidStatus = CifsGood;
2745 tcon->need_reconnect = false;
2746 tcon->tid = smb_buffer_response->Tid;
2747 bcc_ptr = pByteArea(smb_buffer_response);
2748 bytes_left = BCC(smb_buffer_response);
2749 length = strnlen(bcc_ptr, bytes_left - 2);
2750 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2751 is_unicode = true;
2752 else
2753 is_unicode = false;
2754
2755
2756 /* skip service field (NB: this field is always ASCII) */
2757 if (length == 3) {
2758 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2759 (bcc_ptr[2] == 'C')) {
2760 cFYI(1, ("IPC connection"));
2761 tcon->ipc = 1;
2762 }
2763 } else if (length == 2) {
2764 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2765 /* the most common case */
2766 cFYI(1, ("disk share connection"));
2767 }
2768 }
2769 bcc_ptr += length + 1;
2770 bytes_left -= (length + 1);
2771 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2772
2773 /* mostly informational -- no need to fail on error here */
2774 kfree(tcon->nativeFileSystem);
2775 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2776 bytes_left, is_unicode,
2777 nls_codepage);
2778
2779 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2780
2781 if ((smb_buffer_response->WordCount == 3) ||
2782 (smb_buffer_response->WordCount == 7))
2783 /* field is in same location */
2784 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2785 else
2786 tcon->Flags = 0;
2787 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2788 } else if ((rc == 0) && tcon == NULL) {
2789 /* all we need to save for IPC$ connection */
2790 ses->ipc_tid = smb_buffer_response->Tid;
2791 }
2792
2793 cifs_buf_release(smb_buffer);
2794 return rc;
2795 }
2796
2797 int
2798 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2799 {
2800 int rc = 0;
2801 char *tmp;
2802
2803 if (cifs_sb->tcon)
2804 cifs_put_tcon(cifs_sb->tcon);
2805
2806 cifs_sb->tcon = NULL;
2807 tmp = cifs_sb->prepath;
2808 cifs_sb->prepathlen = 0;
2809 cifs_sb->prepath = NULL;
2810 kfree(tmp);
2811
2812 return rc;
2813 }
2814
2815 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2816 struct nls_table *nls_info)
2817 {
2818 int rc = 0;
2819 int first_time = 0;
2820 struct TCP_Server_Info *server = pSesInfo->server;
2821
2822 /* what if server changes its buffer size after dropping the session? */
2823 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2824 rc = CIFSSMBNegotiate(xid, pSesInfo);
2825 if (rc == -EAGAIN) {
2826 /* retry only once on 1st time connection */
2827 rc = CIFSSMBNegotiate(xid, pSesInfo);
2828 if (rc == -EAGAIN)
2829 rc = -EHOSTDOWN;
2830 }
2831 if (rc == 0) {
2832 spin_lock(&GlobalMid_Lock);
2833 if (server->tcpStatus != CifsExiting)
2834 server->tcpStatus = CifsGood;
2835 else
2836 rc = -EHOSTDOWN;
2837 spin_unlock(&GlobalMid_Lock);
2838
2839 }
2840 first_time = 1;
2841 }
2842
2843 if (rc)
2844 goto ss_err_exit;
2845
2846 pSesInfo->flags = 0;
2847 pSesInfo->capabilities = server->capabilities;
2848 if (linuxExtEnabled == 0)
2849 pSesInfo->capabilities &= (~CAP_UNIX);
2850
2851 cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2852 server->secMode, server->capabilities, server->timeAdj));
2853
2854 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2855 if (rc) {
2856 cERROR(1, ("Send error in SessSetup = %d", rc));
2857 } else {
2858 cFYI(1, ("CIFS Session Established successfully"));
2859 spin_lock(&GlobalMid_Lock);
2860 pSesInfo->status = CifsGood;
2861 pSesInfo->need_reconnect = false;
2862 spin_unlock(&GlobalMid_Lock);
2863 }
2864
2865 ss_err_exit:
2866 return rc;
2867 }
2868
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree